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Generac GN-410 Engine

Name: Generac GN-410 Engine
Brand: Generac

The Generac GN-410 is a 0.41 L 1-cylinder engine rated at 2571 rpm, producing up to 10.8 kW. It powers generator sets from Generac, including the C9035, C9036, NP-50G and PRIMEPACT 50. It holds 1.4 L (0.4 gal) of oil.

Also known as: Generac GN-410, GN-410

Part of the Generac GN-410 engine family — 2 variants share parts & fitment.

0.407 L

Displacement

Cylinders

2571 rpm

Rated speed

10 kW

Gross power

On this pageSpecs Generator sets Maintenance FAQ Service intervals Torque & specs Fluids Procedures Wiring

Engine specifications

Oil capacity	1.4 L
Displacement	0.407 L
Cylinders	1
Rated speed	2571 rpm
Gross power	10 kW

Generator sets powered by this engine

Generac C9035Generac C9036Generac NP-50GGenerac PRIMEPACT 50

This engine also powers 145 machine(s) on Power Equipment Info.

How to read your Generac engine serial & model number →

Common problems

The engine will not crank.
Cause: 1. Fuse blown 2. Loose, corroded or defective battery cables as necessary. 3. Defective starter contactor 4. Defective starter motor 5. Dead Battery
Fix: 1. Replace fuse. 2. Tighten, clean or replace battery cables as necessary. 3. Replace starter contactor. 4. Replace starter motor. 5. Charge or replace battery.
The engine starts hard and runs rough.
Cause: 1. Air cleaner plugged or damaged 2. Defective spark plug(s)
Fix: 1. Check, clean or replace air cleaner. 2. Clean, re-gap or replace plug(s).
The engine cranks but will not start.
Cause: 1. Out of fuel 2. Defective fuel solenoid (FS) 3. Open #14 wire from engine control board 4. Defective spark plug(s)
Fix: 1. Replenish fuel. 2. Replace fuel solenoid (FS). 3. Connect open #14 wire to engine control board. 4. Clean, re-gap or replace plug(s).
There is no transfer to standby after utility source failure.
Cause: 1. Defective transfer switch coil 2. Defective transfer relay 3. Transfer relay circuit open 4. Defective control logic board
Fix: 1. Replace defective transfer switch coil. 2. Replace defective transfer relay. 3. Close open transfer relay circuit. 4. Replace control logic board.
There is no AC output from the generator.
Cause: 1. Main line circuit breaker open 2. Generator internal failure
Fix: 1. Reset circuit breaker to ON (or closed).
The engine starts, but shuts down when the Start/Stop switch is released.
Cause: 1. Engine oil level low 2. Defective low oil pressure switch 3. Defective high temperature switch 4. Defective control board
Fix: 1. Check oil and add oil as needed. 2. Replace low oil pressure switch. 3. Replace high temperature switch. 4. Replace control board.
The Auto/Off/Manual switch is set to OFF, but the engine continues to run.
Cause: 1. Defective switch 2. Auto/Off/Manual switch wired incorrectly 3. Defective control board
Fix: 1. Replace defective switch. 2. Correctly wire Auto/Off/Manual switch. 3. Replace control board.
Engine won't crank.
Cause: 1. 15 amp fuse blown. 2. Loose or corroded or defective battery cables as necessary. 3. Battery is discharged or defective. 4. Defective starter contactor. 5. Defective starter motor.
Fix: 1. Replace fuse. 2. Tighten, clean or replace battery cables as necessary. 3. Recharge or replace battery. 4. Replace if defective. 5. Replace if defective.
Engine starts hard, runs rough, will not pull full load.
Cause: Air cleaner plugged or damaged.
Fix: Clean or replace as needed.
Engine spark plug defective.
Fix: Clean, regap or replace as needed.
Engine cranks but won't start.
Cause: Out of fuel.
Fix: Replenish fuel tank.
Engine cranks but won't start
Cause: 1. Out of fuel. 2. Fuel shutoff valve is closed. 3. Fuel pump not operating 4. Automatic choke not operating property 5. Engine is flooded. 6. Fuel Filter is clogged. 7. Defective Controller Circuit Board.
Fix: 1. Replenish fuel. 2. Open fuel shutoff valve(s). 3. Repair or replace if defective. 4. Repair, replace or adjust. 5. Wait 5-10 minutes; try again. 6. Replace filter if clogged. 7. Replace bad circuit board
Bad ignition magneto on engine.
Fix: Replace if defective.
Bad carburetor.
Fix: Adjust, repair or replace.
The engine starts, but shuts down.
Cause: Not fully provided in the text

Compiled from service & troubleshooting documentation across every generator set that uses the Generac GN-410.

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Air filter			73111	100 hr	Amazon $11.69 eBay $17.99
Fuel filter			87769	100 hr	Amazon $43.25 eBay $18.99
Oil filter	Crankcase and oil filter capacity approximately 1,400 mL or 1.5 U.S. quarts		070185	100 hr	Amazon $28.95 eBay $30.00 FridayParts $45.99
Battery	400 Cold-cranking Amperes; battery charge 14 Volts DC, 2 Amperes (max)		—
Belt	BELT (POLY V 4L)-40 in.		75216		Amazon eBay
Oil	API Service Classification SF, SG or SH; SAE 30 summer (SAE 10W-30 acceptable substitute), SAE 5W-30 winter. Do NOT use SAE 10W-40	1.4 L	—	100 hr
Spark plug	Champion RC12YC or AC R45S or Fram Autolite 65		12347	100 hr	Amazon eBay $178.75

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Service intervals

Item	Action	Hours	Months	Notes
Engine oil level	Check	8 hr		Check at least every eight hours of operation, or before use
25-hour break-in check-up	Inspect	25 hr		First service — Change crankcase oil and oil filter; inspect cooling/ventilation openings, ignition, electrical and exhaust systems
25-hour break-in check-up	Other	25 hr		First service — Change crankcase oil and oil filter, check oil level, inspect cooling/ventilation openings, check carburetor and ignition adjustments, inspect electrical system and exhaust system
25-hour check up	Other	25 hr		First service — After 25-hour break-in: change oil and oil filter, check oil level, inspect cooling/ventilation openings, check carburetor adjustments, check ignition system, inspect electrical system, inspect exhaust system
Engine exhaust system and 25-hour check-up	Inspect	25 hr		First service — After 25-hour break-in: change crankcase oil and oil filter, check oil level, inspect cooling/ventilation openings, check carburetor adjustments, check ignition system, inspect entire electrical system, inspect exhaust system
Foam pre-cleaner	Clean	25 hr	3 mo	Every three months or 25 operating hours, whichever comes first; more often in dusty conditions
Foam precleaner	Clean	25 hr	3 mo	Every three months or every 25 hours, whichever occurs first
Engine oil	Change	50 hr		First service — Thereafter every 50 operating hours; more often under heavy load or high ambient temperature
Air intake	Clean	100 hr		Clean more often if necessary
Air intake screen	Clean	100 hr		Clean all foreign material at least once every 100 hours
Engine crankcase oil	Change	100 hr		First service — First change after 25-hour break-in; change more often under heavy load or high ambient
Engine oil filter	Change	100 hr		First service — First change after 25-hour break-in
Engine spark plug	Clean	100 hr		Clean and set gap to 0.030 inch (0.76mm) every 100 hours
Fuel filter	Replace	100 hr	12 mo	Once each year or every 100 hours, whichever comes first (gasoline only)
Oil filter	Change	100 hr		First service — First change after 25 hours, every 100 operating hours thereafter
Paper air filter	Clean	100 hr	12 mo	Clean or replace, whichever comes first
Paper air filter	Replace	100 hr	12 mo	Once each year or every 100 hours, whichever comes first; must be flame retardant type
Paper air filter element	Replace	100 hr	12 mo	Once each year or every 100 hours of operation, whichever comes first
Spark plug	Adjust	100 hr		Clean spark plug and reset gap every 100 hours of operation
Spark plug	Clean	100 hr		Clean the spark plug and reset the spark plug gap every 100 hours
Spark plug gap	Adjust	100 hr		Adjust gap to 0.030 inch (0.76 mm)
Battery	Check		6 mo	Every Six Months (Section 3.9.2)
Battery	Test		6 mo	Every six months check state of charge and condition with an automotive battery hydrometer
Battery state of charge	Test		6 mo	Every six months: check state of charge and condition with an automotive-type hydrometer
Battery state of charge and condition	Test		6 mo	Every six months with automotive type battery hydrometer

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Service specifications

Type	Item	Value	Unit	Condition
Clearance	Exhaust system clearance to combustible material	3	inches (76mm)
Clearance	Generator compartment clearance on sides	1	inch
Clearance	Generator compartment clearance on top	1-1/2	inches
Gap	Spark plug gap	0.030	inch
Gap	Spark plug gap	0.030 inch (0.8 mm)	inch (0.8 mm)
Gap	Spark plug gap (Section 3.5)	0.030 inch (0.76 mm)	inch (0.76 mm)
Other	AC Current (LP Fuel)	37.5	Amperes	at 120 volts
Other	AC Output (LP Fuel)	4,500	Watts (4.5 kW)
Other	Air inlet opening	100	square inches	minimum
Other	Battery Charge Current (max)	2	Amperes
Other	Battery amp-hour rating	70	amp-hour	above 32°F (0°C)
Other	Battery amp-hour rating	95	amp-hour	below 32°F (0°C)
Other	Battery grounding	Negative (-)
Other	Battery voltage	12	volts DC
Other	Battery voltage drop	0.12	volts per 100 amperes
Other	Cold cranking amperes	360	CCA	above 32°F (0°C)
Other	Cold cranking amperes	450	CCA	below 32°F (0°C)
Other	Compartment clearance - front and top	1/2	inch
Other	Compartment clearance - sides	1	inch
Other	Compression ratio	8.6 to 1
Other	Crankcase oil capacity	1.5	U.S. quarts (1.6 liters)
Other	Cranking current	100	DC amperes
Other	Displacement	363	cc
Other	Displacement	480	cc
Other	Displacement	570	cc
Other	Exhaust extension past vehicle outer edge	1	inch (25 mm)	at least
Other	Exhaust temperature rise maximum	117	°F (65°C) above ambient
Other	Exhaust-to-combustible material clearance	3	inch
Other	Flexible fuel hose length	6	inches longer than necessary
Other	Fuel line clearance from exhaust	2	inches
Other	Fuel line clearance from exhaust system parts	2	inches (51 mm)	at least
Other	Fuel octane	87	minimum octane rating	gasoline
Other	Generator compartment clearance (back)	1/2	inch (13 mm)	minimum
Other	Generator compartment clearance (front and top)	1/2	inch (13 mm)	minimum
Other	Generator compartment clearance (sides)	1	inch (25 mm)	minimum
Other	LP gas connection size	3/4	inch (female)
Other	LP gas leak test pressure	90	psi (620 kPa)	not less than
Other	Minimum cooling air inlet opening	100	square inches
Other	Minimum gas flow rate	67	cubic feet per hour
Other	Rated Horsepower	15	hp	@ 4,200 rpm
Other	Rated Maximum Continuous AC Current (Gasoline)	40	Amperes	at 120 volts
Other	Rated Maximum Continuous AC Output (Gasoline)	4,800	Watts (4.8 kW)
Other	Rated horsepower	13	horsepower	at 3600 RPM
Other	Rated horsepower	16	horsepower	at 3600 RPM
Other	Rated horsepower	19	horsepower	at 3600 RPM
Other	Recommended Minimum Battery	400	Cold-cranking Amperes
Other	Recommended minimum LP gas flow rate	67	cubic feet per hour
Pressure	LP gas pressure at gaseous fuel solenoid and secondary regulator inlet	11	inches water column	optimum
Pressure	LP gas pressure at gaseous fuel solenoid valve and secondary regulator inlet	11	inches water column	operating
Pressure	LP gas pressure at inlet to gaseous fuel solenoid	11	inches water column
Pressure	LP gas pressure at regulator inlet (optimum)	11	inches water column
Pressure	LP gas pressure maximum	14	inches water column	do not exceed
Pressure	LP gas system leak test pressure (minimum)	90	psi
Pressure	LP primary regulator supply pressure (max)	14	inches water column
Pressure	Leak test pressure	90	psi (620kPa)
Pressure	Low oil pressure switch	10	PSI	normally-closed; engine shuts down on low pressure
Pressure	Low oil pressure switch setpoint	10	PSI
Pressure	Low oil pressure switch setting	10	psi
Pressure	Oil pressure switch (low oil) setting	10	PSI	normally-closed
Speed	Engine RPM	2,571	rpm

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Recommended fluids

Fluid	Grade	Standard	Ambient	Capacity	Notes
Engine oil	SAE 10W-30	For Service SF		1.5 U.S. quarts	1.6 liters
Engine oil	SAE 10W-30 with API classification 'For Service SF'	API 'For Service SF'			Storage (out-of-service) refill oil
Engine oil	SAE 30	API Service Classification SF, SG or SH			Summer months; acceptable substitute is SAE 10W-30
Engine oil	SAE 30 (summer); SAE 10W-30 acceptable substitute (summer); SAE 5W-30 (winter)	API Service Classification SF, SG or SH		1.0 mL	Crankcase and oil filter capacity approximately 1,400 mL or 1.5 U.S. quarts. Do NOT use SAE 10W-40. Do NOT use special additives.
Engine oil	SAE 30 (summer); SAE 10W-30 acceptable substitute; SAE 5W-30 (winter)	API service classification SF, SG or SH		1.4 liters	Crankcase and oil filter capacity about 1400ml or about 1.5 U.S. quarts. Do not use SAE 10W-40. Use no special additives.
Engine oil	SAE 30 (summer); SAE 5W-30 (winter); SAE 10W-30 acceptable summer substitute	API Service Classification SF, SG or SH		1.4 L	Crankcase and oil filter capacity approximately 1,400 mL or 1.5 U.S. quarts. Do NOT use SAE 10W-40. Do not use special additives.
Engine oil	SAE 30 (summer); SAE 5W30 (winter); SAE 10W-30 acceptable substitute in summer	API service classification SF, SG, or SH		1.4 L	DO NOT USE SAE 10W40. Crankcase and oil filter capacity about 1400ml or about 1.5 U.S. quarts. Use no special additives. For storage, use SAE 10W30, API 'For Service SF'.
Engine oil	SAE 5W-30	API Service Classification SF, SG or SH			Winter months; DO NOT USE SAE 10W-40
Fuel	Commercial propane gas				Vapor withdrawal type system only
Fuel	High quality UNLEADED gasoline				Leaded REGULAR grade is an acceptable substitute. Gasoline containing alcohol (gasohol) not recommended; if used must not exceed 10 percent ethanol and must be removed during storage. Do NOT use gasoline containing methanol.
Fuel	High quality UNLEADED gasoline (leaded REGULAR grade acceptable substitute)				Gasoline with alcohol must not contain more than 10 percent ethanol; do not use methanol
Fuel	High quality unleaded gasoline; leaded REGULAR grade acceptable substitute	If gasoline contains alcohol, not more than 10 percent ethanol and must be removed during storage; do NOT use gasoline containing methanol			PRIMEPACT 50 (02010-0) gasoline; PRIMEPACT 50 LP (04164-0) liquid propane gas, vapor withdrawal only. Propane vaporizes as low as -20 F (-29 C); butane returns to liquid below about 32 F (0 C).
Fuel	High quality unleaded gasoline; leaded REGULAR grade an acceptable substitute				Do not use gasoline containing alcohol; if used, must not contain more than 10 percent ethanol and must be removed during storage. Do NOT use gasoline containing methanol.
Fuel	Liquid propane (LP) gas - vapor withdrawal type system				LP gas may be propane, butane or a mixture. Propane vaporizes as low as -20 F (-29 C); butane returns to liquid below about 32 F (0 C). Higher propane ratio desired below freezing.
Fuel	UNLEADED gasoline, minimum octane rating 87				Leaded REGULAR grade gasoline acceptable substitute. For gasoline-powered units.
Fuel	Unleaded gasoline with minimum octane rating of 87				Leaded REGULAR grade gasoline is an acceptable substitute
Other	Distilled water (battery cells)				DO NOT USE TAP WATER IN BATTERY
Other	LP gas (liquid propane, vapor withdrawal type)		above -29°C		Propane vaporizes as low as -20 °F (-29 °C); butane returns to liquid below about 32 °F (0 °C)

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

Adjusting No-Load Frequency (NP-50G/LP) adjustment

⚠ Avoid overspeeding the engine.

Tools: Pliers, Wrench

Loosen governor clamp bolt.
Push spring end of governor lever clockwise to wide open throttle position.
Hold governor lever at wide open throttle. With pliers, rotate governor shaft fully counterclockwise.
While holding shaft fully clockwise and lever at wide open throttle, tighten governor clamp bolt to 70 inch-pounds (8 N-m).
Start engine, let it stabilize and warm up at no-load.
Turn adjuster nut to obtain frequency reading of 62 Hertz.
Check governor spring location in slot of governor lever. Move spring down one slot for excessive droop; up one slot for greater stability.
After repositioning spring, recheck frequency and readjust adjuster nut if necessary.
Check AC voltage reading. If incorrect, voltage regulator may require adjustment.

Adjusting No-Load Frequency (Q-40G, NP-66G/LP, Q-55G/LP, Q-70G/LP) adjustment

⚠ Avoid overspeeding the engine.

Tools: Screwdriver, Wrench

Loosen governor clamp nut.
Push spring end of governor lever all the way up to wide open throttle position.
Hold governor lever at wide open throttle. Insert screwdriver into slotted end of governor shaft. Rotate governor shaft fully counterclockwise.
While holding governor shaft fully counterclockwise and lever at wide open throttle, tighten governor clamp nut to 70 inch-pounds (8 N-m).
Start engine, let it stabilize and warm up at no-load.
Turn adjuster nut to obtain frequency reading of 62 Hertz.
Check governor spring location. Move spring left on bracket teeth for excessive droop; right for greater stability.
After repositioning spring, recheck frequency and readjust adjuster nut if necessary.
Check AC voltage reading. If incorrect, voltage regulator may require adjustment.

Adjusting No-Load Frequency for NP-50G/LP adjustment

Tools: pliers

Loosen governor clamp bolt.
Push spring end of governor lever clockwise to wide open throttle position of lever.
Hold governor lever at wide open throttle and, with pliers, rotate governor shaft fully counterclockwise.
While holding governor shaft fully clockwise and governor lever at wide open throttle, tighten governor clamp bolt to 70 inch-pounds (8 N-m).
Start engine; let it stabilize and warm up at no-load.
Turn adjuster nut to obtain a frequency reading of 62 Hertz.
Check governor spring location in slot of governor lever.
If droop is excessive, move governor spring down one slot on lever.
For greater stability, move governor spring up one slot on lever.
Recheck frequency reading; readjust adjuster nut if necessary to obtain 62 Hertz at no-load.
When frequency is correct at no-load, check AC voltage; voltage regulator may require adjustment.

Adjusting No-Load Frequency for Q-40G, NP-66G/LP, Q-55G/LP, Q-70G/LP adjustment

Tools: screwdriver

With engine stopped, inspect anti-lash spring. Replace if broken or damaged; attach if disconnected.
Loosen governor clamp nut.
Push spring end of governor lever all the way up to wide open throttle position.
Hold governor lever at wide open throttle and insert screwdriver into slotted end of governor shaft.
Rotate governor shaft fully counterclockwise (CCW).
While holding shaft fully counterclockwise and lever at wide open throttle, tighten governor clamp nut to 70 inch-pounds (8 N-m).
Start engine; let it stabilize and warm up at no-load.
Turn adjuster nut to obtain a frequency reading of 62 Hertz.
Check governor spring location in notched teeth of governor adjustment bracket.
If droop is excessive, move governor spring to the left on notched teeth of bracket.
For greater stability, move governor spring to the right on notched teeth of bracket.
Recheck frequency reading; readjust adjuster nut if necessary to obtain 62 Hertz at no-load.
When frequency is correct at no-load, check AC voltage; voltage regulator may require adjustment.

Voltage Regulator Adjustment adjustment

Tools: screwdriver

Remove generator control panel cover and front panel.
With frequency at 62 Hertz, AC voltage should read 124 volts.
If voltage is incorrect, slowly turn VOLTAGE ADJUST POT on voltage regulator until AC voltage is correct.

Checking No-Load Voltage and Frequency diagnostic

Tools: AC voltmeter, AC frequency meter

Connect an accurate AC voltmeter and AC frequency meter across generator AC output leads.
With generator running, stabilized, and warm, check AC frequency and voltage. Frequency should be about 62 Hz; voltage about 122-126 volts AC.
If frequency is high or low, adjust engine governor to obtain 62 Hertz at no-load; then recheck voltage reading.
If frequency is good but voltage is high or low, adjust voltage regulator to obtain 124 volts at 62 Hz no-load.

LP Gas Leakage Test diagnostic

⚠ Do not use any flame to test for leaks.

⚠ No leakage is permitted.

Tools: separate 12 volts DC source, soap and water or equivalent solution

Use a separate source of 12 volts DC to open the gaseous fuel solenoid valve.
Test all connections, hoses, valves, regulators, fittings, and other fuel system parts under gas or air pressure of not less than 90 psi (620 kPa).
Use soap and water or equivalent solution to check for leaks.
Do not use any flame to test for leaks.
Comply with NFPA Paragraph 318.

Leakage Tests diagnostic

⚠ Do not use any flame to test for leaks.

Tools: Soap and water solution, 12 volts DC source

Do not place generator into service until gas system properly tested for leaks.
Use separate source of 12 volts DC to open gaseous fuel solenoid valve.
Test all connections, hoses, valves, regulators, fittings under gas or air pressure of not less than 90 psi (620kPa).
Use soap and water or equivalent solution to check for leaks.
Do not use any flame to test for leaks.

Testing Under Load diagnostic

Tools: AC frequency meter

Apply electrical loads equal to about 75-100% of unit's rated wattage/amperage capacity.
Check frequency with electrical load applied; frequency should not drop below about 58 Hz under load.
Let unit run at least 30 minutes with load applied; check unit is not running excessively hot and adequate cooling air flow is available.
Do not allow unit to overheat during prolonged operation.

Battery Cable Connections installation

⚠ Be sure the battery cable boot for the starter cable has been installed.

⚠ Damage will result if the battery connections are made in reverse.

Connect the battery cable from the POSITIVE, POS or (+) post to the lug on the starter contactor.
Connect the battery cable from the NEGATIVE, NEG or (-) post to the frame ground connection.
Connect cables so the connectors are clean and tight.

Before Initial Start-up (Post-Installation) installation

⚠ If an LP gas fuel system has been installed it must be properly tested for leaks before operating; no leakage is permitted.

Check the engine crankcase oil level and fill to the dipstick FULL mark with the recommended oil.
Check the fuel supply; gas fuel lines must have been properly purged and leak tested.
Ensure all fuel shutoff valves in the fuel supply lines are open.

Initial Start (Post-Installation) installation

⚠ Do not make any unnecessary adjustments. Avoid overspeeding the engine.

⚠ You must not allow the unit to overheat during prolonged operation.

Turn off all electrical loads by setting the generator's main circuit breakers to OFF (open).
Refer to Part I, Section 2.5 for cranking and starting instructions; use the primer switch to shorten cranking.
Let the engine warm up for about five minutes to allow internal temperatures to stabilize.
Carefully inspect the engine/generator for fuel, oil and exhaust system leaks; correct any leakage immediately.
Apply electrical loads and check proper operation under load; run at least 30 minutes with loads applied.
Turn off all electrical loads by setting the main circuit breakers to OFF.
Let the unit run at no-load for a few minutes, then shut down the engine.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Voltage reconnection

Voltage	Phase	Connection	Leads	Notes
120	1	T1 (red) to Neutral	T1, neutral	After dual voltage reconnection.
120	1	T1 (red) to T2 (white)	T1, T2	Line-to-neutral; protected by circuit breaker CB1; up to 3600 watts.
120	1	T1 (red) to T2 (white) neutral	T1, T2	Protected by circuit breaker CB1; use separately for 120 volts, 1-phase, 60 Hz loads up to 3600 watts (3.6 kW).
120	1	T3 (black) to Neutral	T3, neutral	After dual voltage reconnection.
120	1	T3 (black) to T2 (white)	T3, T2	Line-to-neutral; protected by circuit breaker CB2.
120	1	T3 (black) to T2 (white) neutral	T3, T2	Protected by circuit breaker CB2; total unit load must not exceed maximum rating.
120	single	Figure 1 - Connections for 120 Volts Only	dual 2-wire connection system; neutral grounded	Dual stator AC power windings; generator may have been installed to power 120 volts AC loads
120	single	T1 (red) to T2 (white)	T1 (red), T2 (white)	Protected by 30-amp circuit breaker (CB1); up to 3,600 watts (3.6 kW). T2 is grounded neutral.
120	single	T1 (red) to T2 (white); T3 (black) to T2 (white)	T1 (red) hot, T2 (white) grounded neutral, T3 (black) hot, green ground	T2 is a grounded neutral; separate green ground wire connects to the vehicle junction box. T1-T2 protected by 30-amp breaker (max 3,600 watts); T3-T2 protected by 20-amp breaker (max 2,400 watts); combined loading of the two breakers should not exceed 5,500 watts.
120	single	T3 (black) to T2 (white)	T3 (black), T2 (white)	Protected by 20-amp circuit breaker (CB2); up to 2,400 watts. Combined loading of the two breakers should not exceed 5,500 watts.
120/240	1	Stator leads 11 and 44 to new circuit breaker; 22 and 33 to grounding terminal	11, 44, 22, 33	Reconnection procedure for dual voltage output.
120/240	1	Stator leads 11 and 44 to new circuit breaker; stator leads 22 and 33 to grounding terminal	11, 44, 22, 33	Dual voltage reconnection procedure. Not applicable to Q-40G.
120/240	single	Dual voltage - install jumper wire between the circuit breakers when reconnecting		All units are reconnectable to 120 and/or 240 volts dual voltage output; units are no longer listed per RVIA/ANSI when reconnected for dual voltage output. Refer to the Installation Manual.
120/240	single	Reconnectable for 120- and/or 240-volt dual voltage output	T1 (red), T2 (white), T3 (black), green ground	Units are no longer listed per RVIA/ANSI when reconnected for dual voltage output. 240-volt rating 20 A (02010-2) or 18.8 A (04164-2).
230	Single	Dual two-wire connection system; neutral is grounded; one side of the winding is grounded	T1 (red) 'hot', T3 (black), green ground wire	Dual stator AC power windings; solid-state voltage regulator connected across 1/2 of the output winding, regulating at 115 volts when AC frequency is 50 Hertz
240	1	T1 (red) to T3 (black)	T1, T3	Dual voltage; neutral T2.
240	1	T1 to T3	T1, T3	After dual voltage reconnection. Replace CB1 and CB2 with a single suitably rated circuit breaker.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Parts cataloged across the Generac GN-410 family

300

Part #	Description	Category
073111	Air Filter	air_filter
081646	PRE-CLEANER, AIR FILTER	air_filter
70941	Air Cleaner Element	air_filter
73111	FILTER, AIR	air_filter
73114	FILTER, AIR	air_filter
81646	PRE-CLEANER, AIR FILTER	air_filter
A6564	BASE, AIR CLEANER 27 = 91161 1 BOLT, SHOULDER M6-1.0 x	air_filter
C1228	DECAL, AiR CLEANER 13"	air_filter
C1753	ALTERNATOR PULLEY 21 C1751 1 ALTERNATOR FAN MODEL	alternator
083049	REGULATOR VOLTAGE	avr
83049	Voltage Regulator	avr
029459	SPRING, BELT TENSION	belt
075216	BELT (POLY V 4L)-40"	belt
75216	40" Poly Vinyl 4L Belt	belt
76216	BELT (POLY V 4L)-40"	belt
A9064	10KW ROTOR ASSEMBLY 14 29459 2 BELT TENSIONING SPRING	belt
C1112	V-BELT 04079 (8”)	belt
066386	BRUSH HOLDER	brush
66386	BRUSH HOLDER	brush
90747	BREATHER VALVE ASSEMBLY	crankcase_breather
87769	FUEL FILTER	fuel_filter
021713B	CYLINDER HEAD GASKET	gasket
076701	CRANKCASE GASKET	gasket
077643	GASKET, EXHAUST OUTLET	gasket
086999	GASKET, OIL FILTER SUPPORT	gasket
089228	GASKET, CARB/MANIFOLD	gasket
090239	GASKET, EXHAUST MANIFOLD	gasket
090970	GASKET, CARB/AIR FILTER	gasket
091039	GASKET, MANIFOLD/HEAD	gasket
0A6858	GASKET, COLLECTOR PAN	gasket
0A8010	GASKET, BLOWER HOUSING	gasket
0A8010A	GASKET, BLOWER HOUSING	gasket
0A8407	GASKET, BLOWER SIDE	gasket
0A8726	GASKET, BLOWER / PAN	gasket
0C3150	ROCKER COVER GASKET	gasket
0C4647	GASKET, SOLENOID	gasket
0C6069	GASKET, DIAPHRAGM	gasket
21713B	CYLINDER HEAD GASKET	gasket
21714	CYLINDER HEAD W/VALVE 55 C3150 j ROCKER COVER GASKET	gasket
22237	3/8" LOCK WASHER	gasket
66480	Air Cleaner Gasket	gasket
70987	ROCKER COVER GASKET	gasket
71987	ROCKER COVER GASKET	gasket
74948	FITTING, 5/16" COMPRESSION 76 ©1950 2 GASKET, EXHAUST	gasket
75229	Slide Pan Gasket	gasket
76701	CRANKCASE GASKET	gasket
77643	Exhaust Outlet Gasket	gasket
80308	BREATHER GASKET	gasket
86999	GASKET, OIL FILTER SUPPORT	gasket
89228	GASKET, CARB/MANIFOLD	gasket
90239	GASKET, EXHAUST MANIFOLD	gasket
90970	GASKET, CARB/AIR FILTER	gasket
91039	GASKET, MANIFOLD/HEAD	gasket
91519	GASKET, OIL FILTER SUPPT.	gasket
92363	Heat Riser Box Gasket	gasket
92645	Collector Pan Gasket	gasket
95277	Outlet Adaptor Gasket	gasket
A6562	CARBURETOR	gasket
A6796	GASKET, MUFFLER	gasket
A6858	GASKET, COLLECTOR PAN	gasket
A7299	OIL DRAIN/DIPSTICK TUBE 49 90239 1 GASKET	gasket
A8010	GASKET, BLOWER HSNG	gasket
A8010A	GASKET, BLOWER HSNG	gasket
A8407	GASKET, BLOWER SIDE	gasket
A8693	GASKET, BLOWER HOUSING	gasket
A8726	GASKET, BLOWER / PAN	gasket
A8875	ASSEMBLY, DIPSTICK & CAP	gasket
C1441	GASKET SET, BLOWER 26 22145 3 5/16 FLAT WASHER	gasket
C1557	O-RING, 13/16" LD. 74 01624 2 EXHAUST GASKET	gasket
C1625	GASKET, INTAKE 54 65852 1 CLIP	gasket
C1626	GASKET, CARBURETOR 58 22129 6 5/16" LOCK WASHER	gasket
C2310	GASKET, SET-MUFFLER BOX	gasket
C3150	ROCKER COVER GASKET	gasket
C5401	GASKET, MUFFLER	gasket
031791	CLAMP, HOSE	hose
057822	CLAMP HOSE #8 .53-1.00	hose
074994	HOSE 1\2 ID	hose
0A9539	OIL DRAIN HOSE ASSEMBLY	hose
30340	1/4" FUEL LINE (8" LONG)	hose
35685	CLAMP, HOSE #28 33° 22413 8 CAPSCR., HEX HD.-1/4"-20 x 1"	hose
43791	Hose, 3/8" I.D.	hose
442498	1/4 Dia. 250mm Fuel Hose	hose
57822	CLAMP, HOSE #8	hose
63463	BARBED HOSE FITTING 34. C2417 1 GROUND STRAP	hose
74994	1/2" I.D. x 10" LONG HOSE	hose
8622413	Y%4-20 x 1° HEX HEAD BOLT 70 ©2078 1 OIL DRAIN HOSE	hose
91648	"O" Ring DIA.-14 X 3 WALL	hose
A6581	BREATHER, TUBE	hose
A6922	FUEL TUBE, METAL	hose
A9539	OIL DRAIN HOSE ASSEMBLY	hose
C1702	BREATHER HOSE	hose
C2206	BARBED HOSE FITTING 31 22237 2 3/8" LOCK WASHER	hose
C2423	NUT, SPEED CONTROL 69 43790A 1 90 DEG. HOSE FITTING	hose
070185	Oil Filter	oil_filter
070185B	Recommended Oil Filter	oil_filter
21544	MOTOR, STARTER-12VOLT 45 70185 1 FILTER, OIL	oil_filter
70185	FILTER, OIL	oil_filter
82774	FILTER, OIL	oil_filter
A5360	OIL FILTER SUPPORT	oil_filter
A6358	COVER, TOP FLYWHEEL 35 90892 1 SUPPORT, OIL FILTER	oil_filter
A6898	OIL FILTER SUPPORT 79° = 73132 2 BOOT, SPARK PLUG	oil_filter
0213B	STAND-OFF	other_service
022676	FUSE AGC-15A.	other_service
04164	CRANKSHAFT ASSEMBLY	other_service
053623	CIRCUIT BREAKER	other_service
065795	BATTERY CHARGER RECTIFIER	other_service
075242	SPRING, GENERATOR MOUNT	other_service
086516	VALVE, EXHAUST	other_service
086517	INTAKE VALVE	other_service
087798	SWITCH, SPDT ROCKER	other_service
090144	CIRCUIT BREAKER 20 X 1	other_service
090145	CIRCUIT BREAKER 30 X 1	other_service
092113	SWITCH, SPSTMOM ROCKER	other_service
092572	ASSEMBLY, IGNITION COIL	other_service
0A2666	GASEOUS FUEL SOLENOID	other_service
0A5771	OIL PRESSURE SPRING	other_service
0A6778	SPRING, A/L GOV. LEVER-BELLCRANK	other_service
0A6780	SPRING, A/L BELLCRANK-CARB.	other_service
0A6894	MANIFOLD, LP	other_service
0A8222	SPRING, GOVERNOR	other_service
0A8875	ASSEMBLY, DIPSTICK & CAP	other_service
0C4391	VALVE SPRING	other_service
0C5764A	SPRING, REGULATOR 45N/M 29MM	other_service
0C6070	SPRING-SOLENOID PLUNGER	other_service
0D2530	REGULATOR, GAS FUEL	other_service
20753	HHCS-M6-1.0 x 60 LG 35 22145 1 M8-FLAT WASHER	other_service
21533	PISTON RING SET	other_service
21742	M10 1.5 x 105MM HHFL 37 A8930 1 GOVERNOR GEAR ASSEMBLY	other_service
22097	LOCK WASHER 1/4	other_service
22127	HEX NUT 7/4"-20	other_service
22129	LOCK WASHER-M8	other_service
22131	3/8" FLAT WASHER	other_service
22145	Axle 6000# - 57” frame Hydraulic brake	other_service
22152	LOCK WASHER NO. 10	other_service
22241	3/8"- 16 HEX NUT	other_service
22259	5/16"- 18 HEX NUT	other_service
22264	M4 LOCK WASHER 45 A9992B 2 END BRACKETS	other_service
22287	%-20 x 9%" HEX HEAD LOCK WASHER	other_service
22413	%-20 x 1" HEX HEAD BOLT	other_service
22473	WASHER, FLAT 1/4" 54 22152 8 #10 LOCK WASHER	other_service
22507	A2311	other_service
22676	15 Amp Fuse	other_service
22985	M4/#6 FLAT WASHER	other_service
23484F	SNAP BUSHING A9947 1 25A CIRCUIT BREAKER (6KW)	other_service
23897	#10 FLAT WASHER	other_service
24912	44-20 X 5/8" TAPTITE NO. 10-32 x 4"	other_service
24940	8-32 x %" TAPTITE 25 77052 2 LUG .25-TAB #10-SCRW	other_service
2717A	GROMMET, RUBBER	other_service
27628	HEX NUT-3/8"-16 POSITION	other_service
29289	SCROLL, FLYWHEEL	other_service
31580	PIPE NIPPLE, 3/8" x 8.5" LG. 52 40976 2 M8- 1.25 x 20 SOCKET HEAD	other_service
3163H	8KW ROTOR ASSEMBLY 13 75215 2 SPRING CENTERING WASHER	other_service
31971	BALL BEARING	other_service
32300	HOLDER, FUSE 39 51716 4 M5-0.8 HEX NUT	other_service
33873	Manual-off-auto switch	other_service
3590A	FUSE, 5A 600 VOLT	other_service
36932	SCREW, PAN HEAD	other_service
38353	RUBBER MOUNT 24 23152 4 3/8"-16 x 3/4" HEX HEAD BOLT	other_service
40213	PCB SUPPORT, SNAP-IN 34 22473 1 M6 FLAT WASHER	other_service
40976	SOCKET HD. CAPSCR., M8	other_service
42568	CAPSCREW, HEX HD. - M6-1.0 X 20MM	other_service
43181	M3-0.5 x 10 PAN HEAD 50 38150 6 M4 FLAT WASHER	other_service
43182	M3 LOCK WASHER 49 75475 4 M4 x 0.7 x 10 PMMS	other_service
45756	M6-1.0 x 10 TAPTITE 40 89280D 1 OIL SUMP ASSEMBLY	other_service
48850	TERMINAL BLOCK-5	other_service
51715	M4-0.7 HEX NUT 46 A9992C 1 INSULATING PLATE	other_service
52108	Muffler	other_service
5224G	ENGINE PULLEY, 8 KW 23 22237 4 3/8" LOCK WASHER	other_service
54502	3A Circuit Breaker	other_service
56893	10-24 x %" CRIMPTITE	other_service
57073	NEUTRAL LUG-JUNCTION 29 = 73591 2 FUSE HOLDER	other_service
57821	CAPSCR., HEX HD.-M8-1.25	other_service
59637	SCREW, TAPTITE 3/8"-16 x	other_service
62684	LUG, GROUND 27 = C2261 1 COVER	other_service
64113	WING NUT, M6-1.0	other_service
64182	M6-1.0 x 16 SOCKET HEAD	other_service
65795	Battery Charge Rectifier	other_service
66849	M5-0.8 x 1 5mm Taptite screw	other_service
71978	CONNECTING ROD WITH CAP 32 A5776 1 PRESSURE RELIEF BALL	other_service
71980	PISTON PIN 34 78645 1 GOVERNOR RETAINER	other_service
71983	PISTON PIN RETAINER (C-RING)	other_service
723798	6/8BKW UPPER BEARING 16 45771 4 M8 NUT	other_service
72379B	Bearing Carrier, Upper	other_service
72694	PIVOT BALL STUD 50 86002 1 OUTER GEROTOR	other_service
72696	JAM NUT (ROCKER ARM) 51 86026 1 INNER GEROTOR	other_service
73146	6/8BKW NYLON SLIDES 21 22145 2 M8 FLAT WASHER	other_service
73159	BALL BEARING	other_service
73591	FUSE HOLDER	other_service
74908	M5-0.8 x 10 TAPTITE 22 36932 6 SCREW, PAN HEAD	other_service
74975	ENCLOSURE COVER 19 22131 1 FLAT WASHER-3/8"	other_service
75210A	TERMINAL BLOCK . 33 A2053 1 M6-1.0 x 65 HEX HEAD	other_service
75211	GASEOUS FUEL REGULATOR	other_service
75214	GAS REGULATOR	other_service
75224D	ENGINE PULLEY 22 22131 5 3/8" FLAT WASHER	other_service
75234	RESISTER, 1 OHM 25W 42 A9947B 1 45A CIRCUIT BREAKER (10KW)	other_service
75235	M5-0.8 x 30 HEX HD. 56 31879 2 #4 FLAT WASHER	other_service
75476	M4-0.7 x 16 PHILLIPS 43 A9992A 8 TERMINAL BLOCK	other_service
75995	Bearing Carrier, Lower	other_service
76361	THRUST WASHER	other_service
77006	Generator stud	other_service
77033	SOLDERLESS LUG	other_service
77158	OIL SCREEN PICKUP ASSEMBLY	other_service
77441	MANUAL TRANSFER HANDLE	other_service
78645	GOVERNOR RETAINER	other_service
78658	GOVERNOR ARM ‘R" PIN	other_service
78659	THRUST WASHER	other_service
78691	COVER, OIL PRESSURE	other_service
78694	PUSH ROD GUIDE PLATE 53 90416A 1 CRANKSHAFT ASSEMBLY	other_service
79246	M6- 1.0 x 16 HEX HD. & LOCK	other_service
80077	M4-0.7 x 20 PHILLIPS 47 A9872 1 DIN RAIL	other_service
80309	BREATHER COVER 43 78659 2 THRUST WASHER	other_service
80338	OIL BREATHER SEPARATOR	other_service
83048	Voltage Regulator	other_service
83512	TAPTITE-M8-1.25 x 15 LG CRANK TO CARB.	other_service
83897	TAPPET, SOLID 49 84430 1 BALANCER	other_service
83907	ROCKER ARM 54 90747 1 BREATHER VALVE ASSEMBLY	other_service
83921	BEARING TUBE SHAFT	other_service
843181	M3-0.5 x 10 PAN HEAD 50 =. 38150 6 M4 FLAT WASHER	other_service
86002	OUTER GEROTOR	other_service
86026	INNER GEROTOR	other_service
86514	VALVE SPRING RETAINER 58 79246 4 M6-1.0 x 16MM HEX HEAD.	other_service
86515	VALVE SPRING KEEPER SCREW. AND LOCK WASHER	other_service
86516	EXHAUST VALVE 59 83921 1 BEARING TUBE SHAFT	other_service
86517	INTAKE VALVE	other_service
89473	Bimetal Choke Assembly	other_service
89673	WASHER, VALVE SPRING 63 76329 1 OJL FILL PLUG	other_service
89685	GROMMET, RUBBER	other_service
91188A	Carburetor	other_service
91306	Choke Solenoid	other_service
91308	VALVE SPRING 63 76329 1 OIL FILL PLUG	other_service
91646	DEFLECTOR, EXHAUST 36 91159 1 BUSHING, RUBBER	other_service
92079	SCREW, TAPTITE M6-1.0 x	other_service
92113	dk a_i Dh ok	other_service
92164	GOV. SPRING -ADJUSTMENT	other_service
92362	ROCKER COVER W/FILL	other_service
92572	22717A	other_service
92675A	Exhaust Muffler	other_service
9280D	OIL SUMP ASSEMBLY	other_service
93064	OIL FILL CAP ASSEMBLY	other_service
95685	CLAMP, #28 56 C1863 1 BAFFLE	other_service
956893	CRIMPTITE-#10-24 x 1/2" LG 15LG	other_service
96290	STUD, CARB. MOUNT M6-1.0 x BELLCRANK	other_service
96699	PISTON 37 A8930 1 GOVERNOR GEAR ASSEMBLY	other_service
9673J	SRV C3677 1	other_service
A1442	FLANGED HEX HD. CAP- 35 78691 4 COVER, OIL PRESSURE	other_service
A1495	M4-0.7 x 10 TAPTITE 55 C1226 1 HARNESS (NOT SHOWN)	other_service
A1658	WASHER % SHAKEPROOF 23 =77033 6 SOLDERLESS LUG	other_service
A1801	ASSEMBLY, ENGINE BATTERY 28 51714 4 M3-0.5 HEX NUT	other_service
A2311	%4"-20 x 1" FASTENER	other_service
A2393	M6 1.0 x 16 FLAT SOCKET HD.	other_service
A2666	GASEOUS FUEL SOLENOID	other_service
A2769	LUG, GROUND 8-TABS A9947A 1 35A CIRCUIT BREAKER (8KW)	other_service
A4323	SCROLL, FLYWHEEL 28 38593 1 BRASS STREET ELBOW	other_service
A4456	3/8" SPECIAL LOCK	other_service
A5358	OIL ADAPTOR	other_service
A5649H	6KW ROTOR ASSEMBLY 12 52858 10 FLANGED LOCKING NUT	other_service
A5771	OIL PRESSURE SPRING	other_service
A5776	BALL, OIL PRESSURE	other_service
A6239	ASSEMBLY, CHOKE SOLENOID	other_service
A6529	6 KW STATOR BOLT C1696 1 10KW ALTERNATOR COVER	other_service
A6532	MANIFOLD, INTAKE 21 91916 1 LEVER, GOVERNOR ARM	other_service
A6565	VALVE, WINTER/SUMMER	other_service
A6584	LINKAGE, CHOKE	other_service
A6778	SPRING, ANTILASH. 28 = A6913 1 ROD, LINKAGE GOV. LEVER	other_service
A7308	GOVERNOR SPOOL	other_service
A7336A	CARBURETOR, GN 410 L/P	other_service
A7336B	CARBURETOR 25 91633 1 BELLCRANK, GOV. RODS	other_service
A8930	GOVERNOR GEAR ASSEMBLY	other_service
A9027	OIL ADAPTOR 72 A4456 1 3/8" SPECIAL LOCK WASHER	other_service
A9028	OIL ADAPTOR BOLT	other_service
A9202	10KW SLIDE SUPPORT	other_service
A9226	10KW LOWER BEARING 10 75242 4 ALTERNATOR MOUNTING	other_service
A9227	10KW UPPER BEARING 18 66849 2 M5 x 15MM SCREW	other_service
A9593	EXHAUST DUCT ASSEMBLY 24 23152 4 -3/8"-16 x 34" HEX HEAD BOLT	other_service
A9628	ASSEMBLY, ENCLOSURE 04077, 04109 (7”)	other_service
A9736	C2421	other_service
A9827	BLOWER HOUSING 26 22145 3 5/16"- M8 FLAT WASHER	other_service
A9841	EXHAUST MANIFOLD	other_service
A9877	CAMSHAFT ASSEMBLY 64 86254 1 "O" RING 17.8 1.D. x 2.4 THICK	other_service
A9909	CONTROL PANEL	other_service
A9918	10KW NYLON SLIDES	other_service
A9961	A9963 1	other_service
A9963	BATTERY TRAY SUPPORT	other_service
A9964	ANGLED BATTERY TRAY	other_service
AS649H	6KW ROTOR ASSEMBLY 12 52858 4 FLANGED LOCKING NUT	other_service
C1085	SCREW, PHILIPS PAN HD. MACH.-M3-0.5 X 8MM	other_service
C1227	DECAL, CONTROL PANEL 52 22155 2 #6 LOCK WASHER	other_service
C1350A	WRAPPER, VALLEY	other_service
C1351A	WRAPPER, CYLINDER #1	other_service
C1352A	WRAPPER, CYLINDER 47 C1680 1 SPRING, ANTI-LASH	other_service
C1460	CARBURETOR	other_service
C1468A	WRAPPER CYLINDER #2	other_service
C1616	8/10 KW LOAD BLOCK 35 A4456 1 3/8" LOCK WASHER-SPECIAL	other_service
C1616B	6KWLOAD BLOCK 36 A1658 2 %" LOCK WASHER-SPECIAL	other_service
C1622	OIL TUBE, OUT 78 = 23762 1 STAR WASHER #10	other_service
C1623	OIL TUBE, RETURN 77 ~— 23897 6 #10 FLAT WASHER	other_service
C1676	GOVERNOR LEVER	other_service
C1679	GOVERNOR ROD, CARB	other_service
C1854H	6KW STATOR ASSEMBLY (6/8KW)	other_service
C1855H	8KW STATOR ASSEMBLY 51730 2 M8 x 60 HEX HD. SET SCREW	other_service

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

Common questions

What is the oil capacity of the Generac GN-410?

The Generac GN-410 engine has an oil capacity of 1.4 liters.

What is the displacement of the Generac GN-410?

The Generac GN-410 has a displacement of 0.407 liters with 1 cylinders.

Which generators use the Generac GN-410 engine?

The Generac GN-410 powers 4 generator set(s), including Generac C9035, Generac C9036, Generac NP-50G, Generac PRIMEPACT 50.

How often should you change the oil in the Generac GN-410?

The Generac GN-410 oil change interval is every 100 hours.

What is a common problem with the Generac GN-410 engine?

A commonly reported issue on generators using the Generac GN-410 is: The engine will not crank.. Cause: 1. Fuse blown 2. Loose, corroded or defective battery cables as necessary. 3. Defective starter contactor 4. Defective starter motor 5. Dead Battery. Fix: 1. Replace fuse. 2. Tighten, clean or replace battery cables as necessary. 3. Replace starter contactor. 4. Replace starter motor. 5. Charge or replace battery..