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Generac GH-410 Engine

Name: Generac GH-410 Engine
Brand: Generac

The Generac GH-410 is a 410 L 1-cylinder naturally aspirated engine rated at 3600 rpm. It powers generator sets from Generac, including the 8.1 GN. It holds 1.4 L (0.4 gal) of oil.

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

410.0 L

Displacement

Cylinders

3600 rpm

Rated speed

1.4 L

Oil capacity

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

Engine specifications

Oil capacity	1.4 L
Displacement	410.0 L
Cylinders	1
Aspiration	Naturally aspirated
Rated speed	3600 rpm

Generator sets powered by this engine

Generac 8.1 GN

How to read your Generac engine serial & model number →

Common problems

Unit consumes large amounts of oil.
Cause: 1. Engine over filled with oil. 2. Engine breather defective. 3. Improper type or viscosity of oil. 4. Damaged gasket, seal or hose.
Fix: 1. Adjust oil to proper level. 2. * 3. See “Engine Oil Recommendations”. 4. Check for oil leaks.
Wiring Error ALARM 2099
Voltage and Frequency Drop Excessively When Loads Are Applied
Fix: TEST 14 - CHECK VOLTAGE AND FREQUENCY UNDER LOAD, BOTH LOW -> TEST 15 - CHECK FOR OVERLOAD CONDITION, NOT OVERLOADED -> GOOD -> IF RECONFIGURED TO LP GAS, VERIFY THAT PROPER PROCEDURE WAS FOLLOWED (REFER TO INSTALLATION MANUAL), GOOD -> OVERLOADED -> DISCONTINUE TESTING, REDUCE LOADS TO UNIT’S RATED CAPACITY, TEST 12 - CHECK STEPPER MOTOR CONTROL, GOOD -> BAD -> REPAIR OR REPLACE, LOOK FOR A SHORTED CONDITION IN A CONNECTED LOAD OR IN ONE OF THE LOAD CIRCUITS, GOOD -> TEST 7 - CHECK STATOR AC POWER WINDINGS, ENGINE CONDITION GOOD -> REPAIR OR REPLACE, BAD -> TEST 16 - CHECK ENGINE CONDITION, GOOD -> GO TO “PROBLEM 18 - ENGINE STARTS HARD AND RUNS ROUGH/LACKS POWER” SECTION 4.3
Utility voltage is detected at DC terminal block
Cause: AC utility power sense wires mistakenly connected to DC terminal block
Fix: Remove power from controller, clear warning message
Utility failure 0
Fix: Crank and start engine, transfer load to Generator if Utility returns above 75% nominal for 15 seconds
Unstable Voltage or Incorrect Output Which is Not Triggering a Shutdown
Fix: TEST 1 - CHECK AC OUTPUT VOLTAGE, ERRATIC -> PROCEED TO PROBLEM 3
Undervoltage 1902
Stepper Overcurrent ALARM 2100
Shutdown Alarm/Fault Occurred Problem 18
RPM Sensor ALARM 1501
Prolonged Over-Voltage Undervoltage 1900
Problem 22 – Battery is Dead Battery is Dead
Fix: Test 45 – Check Battery and Cables
Problem 21 – No Low Speed Exercise No Low Speed Exercise
Problem 20 – Generator Will Not Exercise Generator Will Not Exercise
Fix: Test 45 – Check Battery and Cables
Overspeed ALARM
Cause: Prolonged (60 Hz on a 50 Hz unit, 72Hz on 60Hz unit) Over specified Hz for 3 seconds. Possible cause: Stepper motor/mixer body assembly issue.

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

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Air filter			0C8127	200 hr	Amazon $18.99 eBay $15.99 FridayParts $21.87
Fuel filter	Fuel Requirements and Recommendations		—	1080 hr
Oil filter	see Replacement Parts		070185E		Amazon $35.19 eBay $30.00 FridayParts $45.99
Battery	Group 26R, 12 Volts, 525 CCA Minimum		0H3421S	1000 hr	Amazon eBay $283.32
Belt	Side Compartment (V-twin Only)		—
Coolant	Cooling System		—	250 hr
Oil	Checking the Engine Oil Level	1.7	—	250 hr
Spark plug	1.02 mm (0.040 inch) gap (Test 71 lists 0.030 inch)		RC12YC	200 hr	Amazon $19.99 eBay $12.90 FridayParts $19.99

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
Oil level	Check	24 hr	1 mo	Monthly or 24 hours of continuous operation
Oil	Change	200 hr	24 mo	First service — After the first 25 hours of operation
Oil and filter	Change	25 hr		First service — After first 25 hours of operation
Oil filter	Change	200 hr	24 mo	First service — After the first 25 hours of operation
Valve clearance	Check	400 hr	6 mo	First service — After the first 25 hours of operation
Air cleaner	Replace	200 hr	24 mo	2Y or 200 hours
Complete Tune-Up	Other	200 hr	24 mo	To be completed by a Dealer; 2 years or 200 hours
Air cleaner	Clean	400 hr		Clean or replace as necessary; R = Replace as Necessary; 400 hours
Air cleaner	Inspect	400 hr	24 mo	Inspect and change; every 400 hours
Spark plug(s)	Clean	400 hr		Replace every 4 years or 400 hours
Spark plug(s)	Inspect	400 hr	24 mo	Inspect and change; every 400 hours (recommended every 4 years or 400 hours)
Spark plug(s)	Replace	400 hr	24 mo	400 hours
Valve clearance	Adjust	500 hr		First service — Check after first 25 hours; continue at 400-hour intervals
Battery	Check		12 mo	Check charge state; yearly
Battery	Clean		12 mo	Remove corrosion, ensure dryness; yearly
Battery (remove corrosion, ensure dryness)	Inspect		12 mo	Yearly
Battery charge state	Check		12 mo	Yearly
Battery electrolyte level	Check		6 mo	Unsealed batteries only; every 6 months; notify Dealer if repair is needed
Battery electrolyte level (unsealed batteries only)	Check		6 mo	Every 6 months
Battery terminals	Clean		12 mo	Clean and tighten; yearly
Battery terminals (clean and tighten)	Clean		12 mo	Yearly
Fuel lines and connections	Inspect		1 mo	Notify dealer if repair is needed; Monthly
General condition (vibration, noise, leakage)	Inspect		1 mo	Notify dealer if repair is needed
Vibration, Noise, Leakage	Inspect		1 mo	Notify dealer if repair needed; Monthly

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
Gap	Ignition magneto air gap	0.008-0.012 inch (0.20-0.30 mm)	gap	V-twin engines; fixed non-adjustable on single cylinder
Gap	Spark plug gap	0.030	inch	8, 10 & 20kW
Gap	Spark plug gap	0.040	inch	12, 14, 16 & 17kW
Gap	Spark plug gap	0.76	mm (0.030 in)	8, 11, and 20kW units
Gap	Spark plug gap	0.76 mm (0.030 inch)	gap	410 cc and 530 cc engines
Gap	Spark plug gap	1.02	mm (0.040 in)	13, 14, 15, 16, 17kW units
Gap	Spark plug gap	1.02 mm (0.040 inch)	gap	990 cc and 999 cc engines
Other	Compression Ratio GH-410	8.6:1
Other	Compression Ratio GT-530	9.5:1
Other	Compression Ratio GT-990	9.5:1
Other	Compression Ratio GT-999	9.5:1
Other	Rated Horsepower @ 3,600 rpm GH-410	14.8	HP
Other	Rated Horsepower @ 3,600 rpm GT-530	18	HP
Other	Rated Horsepower @ 3,600 rpm GT-990	32	HP
Other	Rated Horsepower @ 3,600 rpm GT-999	36	HP
Other	Starter motor performance, V-twin	Minimum rpm 3250; Maximum Amps 62
Other	Starter motor performance, single cylinder	Minimum rpm 4500; Maximum Amps 9
Pressure	Cylinder leak down tester regulated pressure	80	psi	air source at least 90 psi
Pressure	Fuel pressure LP	10 to 12	inches water column	required
Pressure	Fuel pressure natural gas	5 to 7	inches water column	required
Pressure	Fuel pressure to regulator (LP)	10-12	inches water column (19-22 mm mercury)
Pressure	Fuel pressure to regulator (natural gas)	3.5-7	inches water column (7-13 mm mercury)
Pressure	Fuel pressure to regulator - LP	10-12	inches water column (19-22 mm mercury)
Pressure	Fuel pressure to regulator - natural gas	3.5-7	inches water column (7-13 mm mercury)
Pressure	Fuel pressure, LP vapor	10-12	inches water column	at fuel inlet
Pressure	Fuel pressure, natural gas	5-7	inches water column	at fuel inlet
Pressure	Minimum compression, single cylinder engine	60	psi	cold
Pressure	Normal engine oil pressure	35-40	psi	engine running
Pressure	Oil pressure switch	10	psi	V-twin engines
Pressure	Oil pressure switch	8	psi	single cylinder engines
Resistance	Choke solenoid coil resistance	3.7	ohms
Resistance	Fuel Solenoid FS1 nominal resistance	27-33	ohms
Resistance	Fuel Solenoid FS2 nominal resistance	29	ohms
Resistance	Ignition magneto primary winding	300K ±10K	ohms	both coils in parallel
Resistance	Ignition magneto secondary winding	14K ±3	ohms	both coils in parallel
Resistance	Standby/utility closing coil nominal resistance	1-2	megohms
Resistance	Transfer relay coil resistance	115	ohms	nominal; another listing states 120 Ohms
Resistance	Wire 18 continuity reading	275K-325K	ohms	to frame ground at J1-4
Speed	Exercise (constant)	3600	rpm
Speed	Frequency	60-62	Hertz	no-load
Speed	Generator frequency	61-63	Hz	7kW, across transfer switch terminal lugs E1 and E2
Speed	Generator frequency	greater than 58	Hz	7kW natural gas fuel regulator adjustment
Speed	Low speed exercise	1950	rpm
Speed	Low speed exercise	2400	rpm
Speed	No-load frequency, V-Twin units	60	Hertz	at no-load
Speed	No-load frequency, single cylinder units	62-63	Hertz	at no-load
Speed	Operating RPM	3600	RPM
Speed	Operating rpm	3,600	rpm
Speed	Overspeed shutdown threshold	72	Hz (4320 rpm)
Temperature	Engine temperature for valve adjustment	60 - 80	F (16 - 27 C)
Temperature	High oil temperature switch test range	283-305	°F (139-151°C)	switch should indicate CONTINUITY
Temperature	High temperature switch close temperature	144	°C (293°F)
Temperature	Maximum drying air temperature	185	°F (85°C)	do not exceed
Temperature	Normal operating range	-20 to 122	°F (-29 to 50°C)	tested per UL 2200
Torque	Engine adaptor	25	ft-lbs
Torque	Exhaust manifold	18	ft-lbs
Torque	Governor clamp bolt	70	inch-pounds	8kW single cylinder
Torque	Governor lever clamp bolt	70	inch-pounds	8 N-m
Torque	Governor lever clamp bolt	8	N-m	8kW
Torque	M5-0.8 Taptite screw into aluminum	25-50	in-lbs

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	30 weight organic oil (factory fill)				Units run and tested at factory prior to shipping, no break-in required
Engine oil	SAE 30 above 32°F; 10W-30 between 40°F and -10°F; Synthetic 5W-30 10°F and below	API Service Class SJ, SL or better; use no special additives		1.5 Qts	Oil capacity including filter
Engine oil	Synthetic 5W-30	API SJ, SL or better			For all temperature ranges
Engine oil	10W-30	API SJ, SL or better	-23°C to 4°C		Between 40ºF and -10ºF (4ºC and -23ºC)
Engine oil	SAE 30	API SJ, SL or better	above 0°C		Above 32ºF (0ºC)
Fuel	Liquid Propane (LP) Vapor	Btu content at least 2,520 Btus per cubic foot; pressure 10-12 inches water column (0.36-0.43 psi)			Use vapor withdrawal system only
Fuel	Liquid propane (LP) gas (vapor)	at least 2,500 Btus per cubic foot (93.15 megajoules per cubic meter)		250.0 gallons (946 liters)	Minimum LP tank size recommended when converting from natural gas
Fuel	Natural Gas	Btu content at least 1,000 Btus per cubic foot; pressure 5-7 inches water column (0.18-0.25 psi)
Fuel	Natural gas (pipeline)	at least 1,000 Btus per cubic foot (37.26 megajoules per cubic meter)			Unit is factory set to run on natural gas
Fuel	Natural gas or LP gas (vapor withdrawal only for LP)	Natural gas Btu content at least 1,000 Btus per cubic foot; LP gas at least 2,520 Btus per cubic foot			Required fuel pressure: NG 5 to 7 inches water column; LP 10 to 12 inches water column. NFPA 54 for natural gas, NFPA 58 for liquid propane.

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

Fault codes

Code	Name	Meaning	Severity	Action
BATTERY PROBLEM	Battery Problem	Yellow LED illuminated	Warning	Contact servicing dealer.
CHARGER MISSING AC	Charger Missing AC	Battery charger missing AC input	Warning
CHARGER WARNING	Charger Warning	Yellow LED illuminated	Warning	Contact servicing dealer.
EXERCISE SET ERROR	Exercise Set Error	Exercise timer setting error	Warning
FUEL PRESSURE	Fuel Pressure	Fuel pressure warning	Warning
FUSE PROBLEM	Fuse Problem	Unit will not start in AUTO with utility loss	Warning	Check ATO 7.5 amp fuse. Replace with same type fuse if bad. Contact servicing dealer if fuse is good.
HIGH TEMPERATURE	High Temperature	Unit shuts down during operation	Shutdown	Check ventilation around the intake, exhaust and rear of generator. Contact servicing dealer if no obstruction is found.
INSPECT BATTERY	Inspect Battery	Battery inspection reminder	Info	Inspect battery; press ENTER to clear.
INTERNAL FAULT	Internal Fault	Internal controller fault	Shutdown	Contact servicing dealer.
LOW BATTERY	Low Battery	Yellow LED illuminated	Warning	Clear alarm; check battery via control panel BATTERY MENU; if GOOD contact dealer, else replace battery
LOW OIL PRESSURE	Low Oil Pressure	Unit will not start in AUTO with utility loss	Shutdown	Check oil level. Add oil per Owner's Manual. Contact servicing dealer if oil level is correct.
LOW VOLTS REMOVE LOAD	Low Volts Remove Load	Unit will not start in AUTO with utility loss	Shutdown	Clear alarm and remove household loads, put back in AUTO and restart
MISWIRE	Miswire	Unit will not start in AUTO with utility loss	Shutdown	Contact servicing dealer
NOT ACTIVATED	Not Activated	Unit will not start in AUTO with utility loss	Warning	Refer to activation section in owners manual
OVER VOLTAGE	Over Voltage	Overvoltage alarm	Shutdown	Contact servicing dealer.
OVERCRANK	Overcrank	Unit will not start in AUTO with utility loss	Shutdown	Check fuel line shutoff valve is in the ON position. Clear alarm. Attempt to start in MANUAL. If it does not start or starts and runs rough, contact servicing dealer.
OVERLOAD REMOVE LOAD	Overload Remove Load	Unit shuts down during operation	Shutdown	Clear alarm, remove household loads, put back in AUTO and restart
OVERLOAD WARNING	Overload Warning	Overload warning	Warning
OVERSPEED	Overspeed	Unit will not start in AUTO with utility loss	Shutdown	Contact servicing dealer.
OVERVOLTAGE	Overvoltage	Unit will not start in AUTO with utility loss	Shutdown	Contact servicing dealer
RPM SENSE LOSS	RPM Sense Loss	Unit was running and shuts down, attempts to restart	Shutdown	Clear alarm, remove household loads, put back in AUTO and restart; may be fuel issue, contact servicing dealer
SERVICE A	Service Schedule A	Yellow LED illuminated, maintenance due	Info	Perform SERVICE A maintenance; press ENTER to clear.
SERVICE B	Service Schedule B	Yellow LED illuminated, maintenance due	Info	Perform SERVICE B maintenance; press ENTER to clear.
STEPPER OVER CURRENT	Stepper Over Current	Stepper motor over current	Shutdown	Contact servicing dealer.
STEPPER OVERCURRENT	Stepper Overcurrent	Unit will not start in AUTO with utility loss	Shutdown	Contact servicing dealer
UNDER VOLTAGE	Under Voltage	Undervoltage alarm	Shutdown	Contact servicing dealer.
UNDERSPEED	Underspeed	Unit will not start in AUTO with utility loss	Shutdown	Contact servicing dealer.
UNDERVOLTAGE	Undervoltage	Unit will not start in AUTO with utility loss	Shutdown	Contact servicing dealer
WIRING ERROR	Wiring Error / Miswire	Controller wiring error	Shutdown	Contact servicing dealer.

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 Magneto Flywheel Gap adjustment

⚠ Air gap between ignition magneto and flywheel on single cylinder engines is not adjustable.

Tools: 0.008-0.012 inch thickness gauge

Rotate the flywheel until the magnet is under the module (armature) laminations.
Place a 0.008-0.012 inch (0.20-0.30mm) thickness gauge between flywheel magnet and module laminations.
Loosen the mounting screws and let the magnet pull the magneto down against the thickness gauge.
Tighten both mounting screws.
To remove the thickness gauge, rotate the flywheel.
Repeat the above procedure for the second magneto.

Adjusting Valve Clearance adjustment

⚠ Hold rocker arm jam nut in place as pivot ball stud is turned.

Tools: 10mm allen wrench, feeler gauge, socket wrench

Engine should be cool before checking.
Remove spark plug wires and position away from plugs.
Remove spark plugs.
Position piston at Top Dead Center (TDC) of compression stroke.
Remove four screws attaching valve cover.
Loosen rocker jam nut.
Turn pivot ball stud with 10mm allen wrench while checking clearance.
Tighten jam nut to 174 in/lbs torque and recheck clearance.

Adjusting the Fuel Regulator - 7kW (Natural Gas Only) adjustment

⚠ Do not make any unnecessary adjustments. Factory settings are correct for most applications.

Tools: frequency meter

Start the generator; let it stabilize and warm up at no-load.
Connect a frequency meter across the generator's AC output leads.
Turn the primary adjust screw to obtain a frequency reading.

Check and Adjust Engine Governor (Single Cylinder Units) adjustment

Tools: Frequency meter, torque wrench

Loosen the governor clamp bolt.
Hold the governor lever at wide open throttle position.
Rotate the governor shaft clockwise as far as it will go.
Tighten the governor lever clamp bolt to 70 inch-pounds (8 N-m).
Start the generator; let it stabilize and warm up at no-load.
Connect a frequency meter across the generator AC output leads.
Turn the primary adjust screw to obtain a frequency of 61.5 Hz.
Turn the secondary adjust screw to obtain a frequency of 62.5 Hz.

Check and Adjust Valves adjustment

Tools: 10mm allen wrench, flat feeler gauge, torque wrench

Remove the four (4) screws from the rocker cover.
Remove the rocker cover and rocker cover gasket.
Loosen the rocker arm jam nut.
Use a 10mm allen wrench to turn the pivot ball stud.
Check clearance between rocker arm and valve stem with a flat feeler gauge.
Set valve clearance to 0.05-0.1mm (0.002-0.004 in.) cold.
Hold pivot ball stud with allen wrench and tighten rocker arm jam nut to 174 inch pounds.
Recheck valve clearance to make sure it did not change.
Re-install rocker cover gasket, rocker cover and the four screws.

Reconfiguring the Fuel System (8kW) adjustment

⚠ Gaseous fuels are highly explosive. No leakage permitted.

Tools: plastic T-handle fuel selector

Turn off main gas supply.
Open roof and remove door.
Remove battery if installed.
Insert T-handle pin into selector knob hole.
Pull out to overcome spring pressure, twist clockwise 90 degrees.
Allow selector to return once aligned with LP position.
Save tool with Owner's Manual.
Install battery, door, close roof; reverse to convert back.

Reconfiguring the Fuel System (V-twin) adjustment

⚠ Gaseous fuels are highly explosive. No leakage permitted.

Open roof.
For 10kW: loosen clamp, slide back air inlet hose.
Slide fuel selector on carburetor out towards back of enclosure.
Return inlet hose and tighten clamp securely.
For 12-20kW: remove air cleaner cover.
Slide selector lever out towards back of enclosure.
Return air cleaner cover and tighten two thumb screws.
Close roof; reverse to convert back.

Spark Plug Gap Adjustment adjustment

Tools: wire feeler gauge

Check the spark plug gap using a wire feeler gauge.
Adjust the gap by carefully bending the ground electrode.

Valve Lash Adjustment adjustment

⚠ Contact the Dealer for service assistance

Tools: 10mm Allen wrench (530cc engine) or 13mm Allen wrench (410cc, 990cc, 999cc engines), Feeler gauge, Torque wrench

Remove spark plug wires and spark plugs
Rotate flywheel nut clockwise to bring piston to TDC of compression stroke
Ensure engine is at 60-80°F (16-27°C)
Remove the four screws attaching the valve cover
Loosen rocker jam nut, turn pivot ball stud while checking clearance with a feeler gauge
Adjust to 0.002-0.004 in (0.05-0.1mm) clearance
Hold pivot ball stud and tighten rocker arm jam nut to 174 in-lbs (19.68 N-m)
Recheck valve clearance after tightening
Install new valve cover gasket and reattach valve cover
Install spark plugs and reattach spark plug wires

Electrical Checks diagnostic

⚠ Live transfer switch parts can cause fatal electrical shock

Tools: AC voltmeter, Frequency meter

Ensure generator OFF, main breaker OFF
Turn off breakers/loads powered by generator
Turn on utility power to transfer switch
Check utility voltage across N1/N2 (240 VAC) and N1/N2 to neutral (120 VAC)
Turn off utility supply to simulate outage
Push MANUAL button to start engine
Let engine warm up 5 minutes, set main breaker ON
Check voltage across E1/E2 (238-242V at 59.5-60.5 Hz) and E1/E2 to neutral (119-121V)
Set main breaker OFF, push OFF button to shut down

Generator Tests Under Load diagnostic

Tools: AC voltmeter, Frequency meter

Ensure generator OFF, all loads off
Turn off utility power to transfer switch
Manually set transfer switch to STANDBY position
Push MANUAL button to crank and start
Let engine stabilize, set main breaker ON
Turn on loads one by one
Check voltage (~240V) and frequency (~60 Hz) across E1/E2
Run at full rated load 20-30 minutes, check for leaks/overheating
Verify gas pressure under full load
Turn off loads, set main breaker OFF, run no-load 2-5 minutes
Push OFF button to shut down

Battery Installation installation

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

⚠ Do not dispose of battery in fire.

Set AUTO/OFF/MANUAL switch to OFF.
Turn off utility power to transfer switch.
Remove 7.5A fuse from generator control panel.
Connect red battery cable to positive (POS or +) post.
Connect black battery cable to negative (NEG or -) post.

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
		23 (White #5)	E	Transfer Control Signal Wire
		Control system interconnections	N1, N2, 0, 15B, 23	Can be run in same conduit as AC power if length < 35 feet and all wiring rated 600V
	1	Connect a 2008 and later load center switch to a pre-2008 air-cooled generator: Wire 0 will not be utilized. Remove battery charger from the transfer switch. Connect N1 (BLU) to N1 (YEL), N2 (YEL) to N2 (YEL), 23 (BRN) to 23 (WHT), 194 (ORG) to 15B (RED) using UL approved wire nuts.	N1, N2, 23, 194, 15B, 0	Battery charger in transfer switch will not be utilized in operation of the generator.
	1	Connect a pre-2008 load center switch to a current or future air-cooled generator: Wire 0 will not be utilized. Connect N1 (BLU) to N1 (YEL), N2 (YEL) to N2 (YEL), 23 (BRN) to 23 (WHT), 194 (ORG) to 15B (RED) using UL approved wire nuts.	N1, N2, 23, 194, 15B, 0	Wire 194 changed to 15B on current model air-cooled generators.
12 VDC		194 (Red #4)	D	DC (+) 12 VDC for Transfer Controls
120	1	Battery charger AC input to generator backed-up 120VAC circuit	120VAC hot, neutral	Connect via wire nuts
120 VAC		T1 (White #3)	B	Fused 120VAC for Battery Charger
120/240	1	GENERATOR (STANDBY) source power cables to ATS GENERATOR supply terminals	E1, E2	200A models
120/240	1	Non-essential customer LOAD leads to LSS switch terminals	E1, E2	Load shed switch
120/240	1	UTILITY (NORMAL) power source cables to top of UTILITY SERVICE DISCONNECT circuit breaker	N1, N2	200A models
240	1	Transfer switch terminal lugs: connect utility source hot lines to N1 and N2; connect standby source hot lines (E1, E2) to E1 and E2; connect load lines from T1 and T2 to electrical load circuit; connect UTILITY, STANDBY and LOAD neutral lines to neutral block.	N1, N2, E1, E2, T1, T2	In 1-phase systems with a 2-pole transfer switch.
240 VAC		N1 & N2 (Yellow #1 & #2)	A	Sensing for Utility Dropout and Pickup
DC		0 (Black #3)	C	DC (-) Common Ground Wire

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

Aftermarket parts that fit this engine

0G9241T FridayParts $30.99 0G9241 FridayParts $30.99 0D9760 FridayParts $30.99 GSH410 FridayParts $30.99 FP-XP-0033125

Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.

Common questions

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

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

What is the displacement of the Generac GH-410?

The Generac GH-410 has a displacement of 410.0 liters with 1 cylinders.

Which generators use the Generac GH-410 engine?

The Generac GH-410 powers 1 generator set(s), including Generac 8.1 GN.

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

The Generac GH-410 oil change interval is every 250 hours.

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

A commonly reported issue on generators using the Generac GH-410 is: Unit consumes large amounts of oil.. Cause: 1. Engine over filled with oil. 2. Engine breather defective. 3. Improper type or viscosity of oil. 4. Damaged gasket, seal or hose.. Fix: 1. Adjust oil to proper level. 2. * 3. See “Engine Oil Recommendations”. 4. Check for oil leaks..