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Generac V-Twin Engine

The Generac V-Twin is a 0.48 L 2-cylinder air-cooled engine rated at 3000 rpm, producing up to 16 kW. It powers generator sets from Generac, including the 9592, 9600, 9734 and 9735. It holds 1.65 L (0.4 gal) of oil and 1.15 L (0.3 gal) of coolant.

Also known as: V-Twin, Generac V-Twin

Part of the Generac V-Twin engine family — 2 variants share parts & fitment.

0.48 L

Displacement

Cylinders

3000 rpm

Rated speed

16 kW

Gross power

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

Engine specifications

Oil capacity	1.65 L
Coolant capacity	1.15 L
Displacement	0.48 L
Cylinders	2
Aspiration	Air-Cooled
Rated speed	3000 rpm
Gross power	16 kW

Generator sets powered by this engine

Generac 9592 Generac 9600 Generac 9734 Generac 9735Generac NP52GGenerac NP66GGenerac NP72G

This engine also powers 18 machine(s) on Power Equipment Info.

How to read your Generac engine serial & model number →

Common problems

Bottom out 9202-1
Q 7000 120/240 58/29 60 3600 | 2570 | Bottom out | Universal 92116 9677-3
NP 6600 120/240 55/27 60 3600 | 2700 | Bottom out | Universal 92116 9600-0
NP 5000 120/240 41/20 60 3600 | 2751 Bottom out | Universal 92116 9712-0
Bottom out | Out-the-side 9205-1
7000 120/240 Bottom out Universal 9593-1
6600 9509-2
ENGINE CRANKS BUT WON'T START
Fix: TEST 28- CHECK FUEL SUPPLY OF UV § WIRE 14 POWER GOOD LOW FUEL REPLENISH FUEL SUPPLY REPLACE ENGINE CONTROLLER CIRCUIT BOARD TEST 30- CHECK FUEL PUMP TEST 31- CHECK FUEL SOLENOID (Q70G MODELS ONLY) GOOD BAD REPLACE PUMP REPLACE SOLENOID TEST 32- CHECK IGNITION SPARK WEAK OR NO SPARK CLEAN AND REGAP OR REPLACE SPARK PLUG TEST 34- CHECK IGNITION POWER SUPPLY BAD REPLACE ENGINE CIRCUIT BOARD TEST 36- CHECK CARBURETION GOOD ENGINE RUNS OK NOW BAD STOP TESTS ADJUST, REPAIR OR REPLACE AS NECESSARY
Q 7000 120/240 58/29 60 3600 | 2570 | Bottom out 9736-1
Q 5500 120/240 46/23 60 3600 | 2570 | Bottom out | Universal 92116 9735-1
PRIMING FUNCTION DOES NOT WORK
Fix: REDUCE LOAD TEST 17- CHECK ENGINE POWER TEST 19- TEST 18- TRY ENGINE STILL CRANKING THE CRANKS WON'T sen PRIMER ENGINE NORMALLY PRIME SWITCH GO TO PROBLEM 6
NP 6600 120/240 55/27 60 3600 | 2300 | Bottom out |Out-the-side| 89405 9207-1
NO-LOAD VOLTAGE & FREQUENCY GOOD
Cause: ZERO VOLTS NO-LOAD FREQUENCY LOW OR ZERO VOLTAGE & BOTH HIGH RESIDUAL VOLTS FREQUENCY OR LOW GOOD
Fix: GO TO PROBLEM 1 GO TO PROBLEM 2 GO TO PROBLEM 3 GO TO PROBLEM 4
Low Oil Pressure LOP
High Oil Temperature HTO

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

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Air filter	Paper element with foam pre-cleaner		73123	100 hr	Amazon eBay $25.00
Fuel filter			75213	100 hr	eBay $56.99 FridayParts $56.99
Oil filter			70185	100 hr	Amazon eBay $18.99 NAPA $9.09 KuduParts $11.00
Battery	Above 32°F: 70 amp-hours, 360 CCA. Below 32°F: 95 amp-hours, 450 CCA.		—
Belt			—
Coolant	50% soft water and 50% ethylene glycol base anti-freeze; low silicate	2.0 U.S. gallons	—
Oil	high quality detergent oil classified 'For Service SF' and having a viscosity rating of SAE 10W-30	3.0 U.S. quarts	—	50 hr
Spark plug	Champion RC12YC; AC R45S; Fram Autolite 65; Gap 0.030 inch (0.8mm)		72347	100 hr	Amazon eBay $9.99

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
Engine crankcase oil level	Check	8 hr		or before each use
Engine oil level	Check	8 hr		at least every eight hours of operation, or before use
Air cleaner foam pre-cleaner	Clean	25 hr	3 mo	clean and re-oil; whichever occurs first; more often in dusty conditions
All fluid levels	Check	25 hr		First service — 25-Hour Check Up
Cooling and ventilation openings	Inspect	25 hr		First service — part of 25-hour check up
Cooling and ventilation openings on the vehicle	Inspect	25 hr		First service — 25-Hour Check Up
Electrical system	Inspect	25 hr		First service — part of 25-hour check up
Engine carburetor adjustments	Check	25 hr		First service — part of 25-hour check up
Engine crankcase oil and oil filter	Change	25 hr		First service — 25-hour check up, by authorized service facility
Engine exhaust system	Inspect	25 hr		First service — part of 25-hour check up
Engine ignition system	Check	25 hr		First service — part of 25-hour check up
Engine oil and oil filter	Change	25 hr		First service — 25-hour check up.
Entire electrical system	Inspect	25 hr		First service — Part of 25-Hour Check Up
Fluid levels	Check	25 hr		First service — part of 25-hour check up
Foam pre-cleaner	Clean	25 hr	3 mo	whichever occurs first
Engine Governor Oil Level	Check	50 hr		First service — prior to initial use and every 50 operating hours thereafter
Engine oil	Change	50 hr		First service — thereafter; more often under heavy load/high ambient
Air cleaner paper filter	Replace	100 hr	12 mo	whichever comes first; must be flame retardent type
Air intake screen	Clean	100 hr		at least every 100 hours; clean more often if necessary
Fuel filter	Replace	100 hr	12 mo	whichever comes first
Oil filter	Replace	100 hr		First service — every 100 operating hours thereafter
Paper air filter	Replace	100 hr	12 mo	whichever comes first
Spark plug	Clean	100 hr		Clean and set gap to 0.030 inch (0.76mm) every 100 hours
Spark plugs	Clean	100 hr		reset gap to 0.030 inch (0.8mm); do not blast clean
Generator exercise run	Test	168 hr		Start and operate at least once every seven days; run at least 30 minutes
Battery	Inspect		1 mo	Weekly inspect posts, cables, fluid level.
Battery	Test		6 mo	Every six months check state of charge/condition with hydrometer.
Battery state of charge	Test		6 mo	every six months, by automotive service facility
Battery state of charge and condition	Test		6 mo	have checked by automotive service facility with 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	Belt tension spring compressed length	5/8	inch (16 mm)	two adjusting bolts
Clearance	Lower bearing carrier spring compressed length	7/8	inch (22 mm)	four adjusting bolts
Clearance	Pre-choke adjustment, carburetor choke plate from full open	1/8	inch	choke solenoid not actuated
Gap	Armature Air Gap	0.008-0.012	inch
Gap	Breaker Point Gap	0.018-0.022	inch
Gap	Choke plate position (cold, solenoid not actuated)	1/8	inch from full open	cold, solenoid not actuated
Gap	Spark Plug Gap	0.030	inch
Gap	Spark Plug Gap (Liquid-Cooled)	0.031-0.035	inch
Gap	Spark plug gap	0.76	mm
Gap	Spark plug gap	0.8	mm
Other	Battery charge winding output to energize CR1	9-12	volts AC
Other	Bonding conductor	No. 8 AWG copper wire minimum		flexible conductor if replaced
Other	Carburetor idle mixture adjustment	1-1/4 turns counterclockwise after seating	turns
Other	Choke Solenoid De-energized Time	2	seconds
Other	Choke Solenoid Energized Time	0.2-0.4	seconds
Other	Circuit breakers	20 and 30	amps
Other	Compression Ratio	8.5 to 1
Other	Compression ratio	8.6 to 1
Other	Displacement	479.4	cc
Other	Drive belt tension spring length (side of generator)	16	mm (5/8 inch)
Other	Drive belt tension spring length (stator can bolts)	13	mm (1/2 inch)
Other	Engine Cranking Current	Approximately 100	d-c amperes
Other	Engine crankcase capacity	1.5	U.S. quarts
Other	Engine displacement	480	cc
Other	Engine displacement	570	cc
Other	Field boost diode rating	1 amp at 600 volts
Other	Field boost resistor rating	47 ohms at 2 watts
Other	Fuel Pump Primer hold time	30	seconds	cold engine not started in more than two weeks
Other	Grounding conductor minimum	No. 8 AWG	copper wire
Other	Maximum cranking time	15	seconds
Other	Oil capacity	1.7	liters
Other	Overvoltage Limit	4	percent
Other	Rated Engine Horsepower	16	hp	at 3000 rpm
Other	Rated horsepower	19	hp at 3600 rpm
Other	Rated horsepower Q-55G	15	hp	at 3600
Other	Rated horsepower Q-70G	18	hp	at 3600 rpm
Other	Rated max. continuous AC output	5500	watts (5.5 kW)	120 V
Other	Rated max. continuous AC output	7000	watts (7.0 kW)	120 V
Other	Rated max. continuous current	22.9	AC amps	240 V
Other	Rated max. continuous current	29.1	AC amps	240 V
Other	Rated max. continuous current	45.8	AC amps	120 V
Other	Rated max. continuous current	58.3	AC amps	120 V
Other	Recommended spark plugs	Champion R12YC / Fram R45S / Autolite 65
Other	Rotor poles	2	poles
Other	Transfer Switch Rating	100 amps at 250 volts maximum
Other	Varistor rating	22 volts, 0.6-0.8 Joule
Other	Wire 14 diode rating	6 amp, 100 volts
Pressure	Compression Difference Between Cylinders	14	psi
Pressure	Compression Pressure Minimum	164	psi	at 350 rpm
Pressure	Compression Pressure Standard	192	psi	at 350 rpm
Pressure	Fuel Pressure Maximum	14	inches water column
Pressure	Fuel Pressure Minimum	11	inches water column
Pressure	Fuel inlet pressure required	0.39	PSI
Pressure	Fuel inlet pressure required	11	inch WC
Pressure	Low Oil Pressure Shutdown	2-6	psi
Pressure	Low oil pressure shutdown	8-10	PSI	switch contacts close below this pressure
Pressure	Low oil pressure shutdown	about 8-10	PSI	oil pressure switch closes below this
Pressure	Low oil pressure shutdown switch	2-6	PSI	contacts close below this pressure
Pressure	Low oil pressure shutdown switch actuation	8-10	PSI	below this pressure switch contacts close and engine shuts down
Pressure	Low oil pressure shutdown switch setting	2-6	PSI	shuts down when oil pressure drops below this value

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
Coolant	50% soft water and 50% ethylene glycol base anti-freeze	Use only SOFT WATER and LOW SILICATE anti-freeze		2.0 U.S. gallons	approx. 8.5 liters; liquid-cooled
Engine oil	SAE 10W-30	high quality detergent oil classified "For Service SF"		1.5 U.S. quarts	Engine crankcase oil capacity is 1-1/2 U.S. quarts.
Engine oil	SAE 20W	API SC, SD, SE or SF	below 0°C		Liquid-cooled; below 32 F (0 C)
Engine oil	SAE 5W-20/5W-30	API SF, SF/CC, or SF/CD	below -7°C		Air-cooled; below 20 F (-7 C)
Engine oil	SAE 5W-30 Synthetic	MOBIL Formula 5W-30			Air-cooled; for all seasons
Engine oil	SAE 30	API SF, SF/CC, or SF/CD	above 16°C		Air-cooled; above 60 F (16 C)
Engine oil	SAE 40	API SC, SD, SE or SF	above 30°C		Liquid-cooled; above 86 F (30 C)
Fuel	High quality UNLEADED gasoline; leaded REGULAR grade gasoline is an acceptable substitute				Do not use gasoline containing more than 10 percent ethanol; must be removed from tank during storage. Do NOT use any gasoline containing methanol. Optional LP gas (propane) fuel system available.
Fuel	LP (propane) Gas	rated at least 2 BTU's per cubic foot			vapor withdrawal type supply system required
Fuel	LP gas (propane)				LP-vapour withdrawal fuel system as standard; requires inlet pressure of 11" WC (0.39 PSI)
Fuel	Natural Gas	rated at least 1000 BTU's per cubic foot
Fuel	UNLEADED gasoline				Leaded REGULAR grade acceptable substitute. Do NOT use highly leaded premium. Gasoline containing alcohol (gasohol) NOT recommended.
Fuel	Unleaded gasoline				Leaded regular acceptable substitute. Do not use gasoline containing methanol. If alcohol, max 10% ethanol and remove during storage.
Fuel	unleaded gasoline				Leaded REGULAR grade gasoline is an acceptable substitute. Do NOT use any highly leaded premium gasoline. Use of any gasoline containing alcohol, such as 'gasohol', is NOT recommended.
Fuel	LP gas (liquefied petroleum gas)	Vapor withdrawal type fuel system	-29°C to 0°C		Propane vaporizes as low as -20 degF (-29 degC); butane returns to liquid below about 32 degF (0 degC). Higher propane ratio desired below freezing
Other	Distilled water				For battery cells only; DO NOT USE TAP WATER IN BATTERY

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

Procedures

Adjust Belt Tension and Generator Springs adjustment

Turn the two adjusting cap screws to change drive belt tension.
Adjust until the compressed length of the two belt tension springs is 5/8 inch (16 mm).
Turn the adjusting bolts to set the four lower bearing carrier springs to a compressed length of 7/8 inch (22 mm).

Adjust Drive Belt Tension adjustment

Tools: wrenches

Turn two adjusting bolts until compressed length of springs is 5/8 inch (16mm).
To adjust four lower bearing carrier springs, turn adjusting bolts to obtain compressed spring length of 7/8 inch (22mm).

Adjust Engine Governor (GN-360 Engine) adjustment

Tools: AC frequency meter

Loosen the governor lever clamp bolt.
Hold governor lever at full INC RPM position and rotate governor shaft clockwise fully.
Tighten governor lever clamp bolt to 70 inch-pounds (8 N-m).
Connect an AC frequency meter across generator AC output leads.
Turn off all loads; start the engine and let it warm up.
Check frequency: 61.5-63.5 Hertz (60 Hz units) or 50.5-51.5 Hertz (50 Hz units).
Turn the speed adjust nut until correct frequency is obtained.
If frequency is unstable, turn carburetor idle jet until engine stabilizes.
Apply load near maximum rated wattage; adjust idle jet for best operation and highest rpm.
For adjustable main jet, loosen locknut and turn main jet counterclockwise until frequency drops.
Turn main jet clockwise until frequency drops again.
Turn main jet counterclockwise to obtain best and most stable frequency.
Hold the adjustment and tighten the main jet locknut.
Turn off loads and repeat.

Adjust Engine Governor (V-Twin Engine) adjustment

⚠ Failure to do the static governor adjustment before starting could cause overspeeding, engine damage, personal injury or property damage.

⚠ All linkage MUST be installed to make this adjustment.

Tools: AC frequency meter, torque wrench, M6 crows foot wrench

For gasoline, turn idle mixture valve clockwise until lightly seated; do not force.
Turn idle mixture valve counterclockwise 1-1/4 turns.
For gaseous, turn idle and slotted adjustments clockwise until softly seated.
Turn both adjustments counterclockwise 1-1/2 turns for 6600, 7000, 7200 watt models.
Turn both counterclockwise 2 turns for 5000, 5200, 5500 watt models; tighten load block lock nut.
Loosen the governor clamp nut.
Push governor lever to wide open throttle; do not bend the lever.
Hold lever wide open and rotate governor shaft counterclockwise as far as it will go.
Tighten governor clamp nut to 70 inch-pounds (8 N-m).
Connect an accurate AC frequency meter to generator AC output leads.
Start engine, let it stabilize and warm up at no load.
Turn adjuster nut to obtain 62 Hertz (60 Hz units) or 51 Hertz (50 Hz units).
Apply load near full rated capacity; note frequency droop and hunting.
If frequency droops below 58 Hertz, move governor spring closer to anti-lash spring.
Readjust and repeat until no-load speed correct and no excessive droop or hunting.

Adjusting Drive Belt Tension adjustment

Tools: ruler

Adjust the spring on four stator can bolts to a length of 13mm (1/2 inch).
Adjust two sets of springs on the side of the generator to a length of 16mm (5/8 inch).
This will provide proper belt tension.

Automatic Choke Adjustment adjustment

Tools: screwdriver

To adjust choke solenoid: push choke solenoid plunger in until it bottoms out. With plunger bottomed, carburetor choke plate should be closed. If not fully closed, loosen two solenoid screws and repos
To adjust choke heater: with engine cold and solenoid NOT actuated, check position of carburetor choke plate. Choke plate should be 1/8 inch from its full open position. If off by a small amount, bend
Observe automatic choke operation while cranking the engine. Choke solenoid should energize and choke plate should close for about 0.2 to 0.4 seconds. It should then de-energize and choke plate should

Carburetor Adjustment adjustment

Tools: screwdriver

To adjust idle mixture, turn the idle mixture screw clockwise until it just seats.
Then, turn the screw counterclockwise 1-1/4 turns.
There is no main jet adjustment. That jet is fixed and tested up to 8000 feet altitude.

Check/Adjust Engine Governor (V-Twin) adjustment

⚠ Static governor adjustment must be made before engine start to prevent overspeed

Tools: torque wrench, frequency meter, screwdriver

Adjust carburetor: turn idle mixture valve clockwise to seat, then counterclockwise 1-1/4 turns.
For gaseous fuel, adjust load block: turn idle and slotted adjustments clockwise to seat; for 6600-7200W turn CCW 1-1/2 turns; for 5000-5500W turn CCW 2 turns.
Static governor: loosen governor clamp nut.
Push governor lever to wide open throttle.
Rotate governor shaft counterclockwise as far as it will go.
Tighten governor clamp nut to 70 inch-pounds (8 N-m).
Start engine and adjust to 62 Hz no-load for 60 Hz units.
Apply load and adjust governor spring to prevent droop below 58 Hz.

Check/Adjust Voltage Regulator adjustment

Tools: AC voltmeter, AC frequency meter

Perform Test 3, the Fixed Excitation Test.
Adjust the voltage adjust potentiometer only while the unit runs at correct governed no-load speed.
Set no-load frequency to about 61-63 Hertz; AC output voltage should be about 122-126 VAC.

Engine Governor Adjustment adjustment

Tools: screwdriver, frequency meter, tachometer

Visually inspect the anti-lash spring. Make sure it is not broken or disengaged. Spring ends must be hooked into governor lever and into carburetor throttle lever.
Loosen the governor clamp nut. Hold the governor lever in its wide open throttle position, then use a screwdriver to rotate the governor shaft fully counterclockwise. Hold this position and tighten th
Start the engine, let it stabilize and warm up. Both line breakers should be set to their "Off" or "Open" position.
Turn the adjuster nut to obtain a frequency reading of 62 Hz. If a tachometer is used, set engine speed: NP45G=2160 rpm, NP55G=2571 rpm, NP65G=2805 rpm, NP52G=2300 rpm, NP66G=2700 rpm, NP72G=2900 rpm.
Determine if the governor spring is properly located in the notched teeth of the governor adjustment bracket. If droop is excessive, move the governor spring to the left. For greater stability, move t
After repositioning the governor spring, recheck frequency (or rpm) and, if necessary, readjust the adjuster nut to 62 Hertz or to the correct engine speed.

Engine Ignition System Adjustment adjustment

Tools: feeler gauge, shim stock, screwdriver

Set spark plug gap to 0.030 inch.
Place a piece of 0.008-0.010 shim stock between the ignition module (or armature) and the flywheel.
Loosen mounting screws and let the magnet pull the armature down against the shim stock.
Tighten both mounting screws.
Rotate the flywheel to remove shim stock.

Valve Adjustment adjustment

Tools: feeler gauge, screwdriver, torque wrench

Remove the valve covers.
Turn the crankshaft until piston in cylinder being checked is at top dead center (TDC) of its compression stroke.
Insert a screwdriver through spark plug hole so that it contacts the piston. Turn the crankshaft past top dead center until piston has moved downward 1/4 inch (6.35mm).
Insert a feeler gauge between valve stem and rocker arm. Clearance should be 0.004-0.006 inch (0.10-0.16mm). Adjust clearance as required until correct.
When clearance is correct, hold the adjusting screw and tighten locknut to 60 inch-pounds torque.
Recheck valve clearance and readjust if needed.

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
		Grounding/bonding	Bonding conductor; No. 8 AWG copper wire minimum	Ground generator by solid mounting to vehicle frame/chassis or by approved bonding conductor. DO NOT disconnect bonding conductor. If replaced, use only flexible No. 8 AWG copper wire minimum.
120		Single voltage AC output (factory connection)	Stator power leads 11P and 33 at the main circuit breakers; 22P and 44 at the 4-tab ground terminal	Most units shipped connected for 120 VAC output only. Some models have a 30 amp and a 20 amp main breaker; others have two 30 amp breakers.
120	1	Connection for 120 Volts Only (Figure 1)	Dual stator power windings; grounded neutral; CB1	These air-cooled Q Series generator sets are equipped with dual stator AC power windings supplying power by a dual 2-wire connection system.
120	1	Dual 2-wire connection system (120 volts only)	Dual stator power windings; grounded neutral	Figure 1 — Connection for 120 Volts Only; jumper between circuit breakers must be removed when connecting for 120/240 volts
120	1	Dual 2-wire connection system from dual stator AC power windings (Figure 1)	Dual stator AC power windings; grounded neutral	Used where units power only 120 volts AC loads
120	1-Phase	Factory connection for 120 volts AC only	T1 (red), T3 (black), T2 (white)	Neutral is grounded.
120	single	120 volts only — dual 2-wire connection with jumper between circuit breakers installed		Figure 1 connection for 120 volts only; grounded neutral
120 volts AC	1-Phase	Factory wired for 120 volts AC only; grounded neutral	T1 (red), T2 (white), T3 (black); stator leads 11, 33, 22, 44	CB1 and CB2 line breakers
120 volts only	1	jumper installed between circuit breakers	T1/T2/T3/T4, neutral	stator dual 2-wire connection system
120 volts only	single	jumper wire installed between circuit breakers for 120/240V reconnection	T1/T2/T3/T4, grounded neutral	dual stator AC power windings, dual 2-wire connection system; neutral grounded
120/208	3-Phase	parallel wye	S1 through S12; bolted junctions: 1: S4,S5,S6,S10,S11,S12 = Neutral (00); 2: S1 and S7 = Line E1; 3: S2 and S8 = Line E2; 4: S3 and S9 = Line E3	Voltage Code B
120/240		Dual voltage AC output (reconnection)	Stator output leads 11P and 44 form the two hot leads (T1 Red and T3 Black); junction of leads 22P and 33 forms the neutral (T2 White)	Neutral line remains grounded. Remove the jumper wire between the two main circuit breakers. Existing breakers may be re-used, or a 2-pole breaker rated closer to unit capacity may be installed.
120/240	1	Reconnect dual stator windings for dual voltage output; remove the jumper between the circuit breakers	Dual stator AC power windings	All units are reconnectable to 120 and/or 240 volts, dual voltage output. Units are not listed per RVIA/ANSI when reconnected for dual voltage output. Replacement line breakers consist of two separate breakers with a connecting piece between the handles.
120/240	1	Reconnectable dual voltage output	Dual stator power windings	All units are reconnectable to 120 and/or 240 volts, dual voltage output; units are not listed per RVIA/ANSI when reconnected for dual voltage output
120/240	1	Reconnected for dual voltage AC output	Dual stator power windings	Be sure to remove the jumper between the circuit breakers when connecting for 120/240 volts. If reconnected for dual voltage, the unit is no longer RVIA listed.
120/240	1-Phase	3-wire	Leads 11 and 44 form hot lines; junction of Leads 22 and 33 forms neutral	Voltage Code A
120/240	1-Phase	Reconnected for dual voltage output	T1 (red) hot, T3 (black) hot, T2 (white) neutral	Neutral is grounded. Connect stator leads 22 and 33 together and route to grounding terminal (GT). Connect stator a-c output leads 11 and 44 to the 2-pole circuit breaker.
120/240	1-Phase or 3-Phase	delta connected	Two of six stator coils are double-wound; connect 240 volts AC loads across Lines E1 and E2; connect 120 volts AC loads across Lines E1 to 00 or E3 to 00	Voltage Code D
120/240	single	Dual voltage output — remove the jumper between the circuit breakers		Units are not listed per RVIA/ANSI when reconnected for dual voltage output; replacement line breakers consist of two separate breakers with a connecting piece between handles
120/240 volts AC	1-Phase	Reconnected for dual voltage output; grounded neutral	Connect stator leads 11 and 44 to 2-pole breaker; attach T1 (red) and T3 (black); connect stator leads 22 and 33 together and route to grounding terminal (GT)	Neutral is grounded
120/240V	1	dual voltage output	11P and 44 hot; 22P and 33 neutral	Neutral remains grounded; jumper removed; may use 2-pole breaker
120V	1	single voltage output	11P,22P,33,44	Factory connected; jumper between main circuit breakers

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 V-Twin family

Part #	Description	Category
14-6	Valley Cover (Item 14 in Figure 8-3)	Air cleaner
3388840M2	Cab Air	Air filter
3902782M1	Air	Air filter
AF25849	Cab Air	Air filter
AF26398	Air	Air filter
AH115833	AIR FILTER, STANDARD	Air filter
AH115836	RECIRCULATION AIR FILTER	Air filter
AH168783	AIR FILTER, HEAVY DUTY	Air filter
AR70106	ENGINE PRIMARY AIR FILTER	Air filter
AR70107	ENGINE SECONDARY AIR FILTER	Air filter
AR80652	ENGINE PRIMARY AIR FILTER	Air filter
AR80653	ENGINE SECONDARY AIR FILTER	Air filter
AR81313	ENGINE SECONDARY AIR FILTER	Air filter
AR82915	ENGINE PRIMARY AIR FILTER	Air filter
AR95758	ENGINE PRIMARY AIR FILTER	Air filter
AR95759	ENGINE SECONDARY AIR FILTER	Air filter
AN500T0186	ALTERNATOR	Alternator
AN500T0190	ALTERNATOR	Alternator
72501530	Fuel, User Friendly Version	Fuel filter
72501531	Fuel/Water Sep Spin-On	Fuel filter
AR86745	FUEL FILTER	Fuel filter
AT81478	ENGINE FUEL WATER SEPARATOR FILTER	Fuel filter
AMC7NN8286A	Radiator Hose, Lower	Hose
3902287M1	Hydraulic, Cartridge	Hydraulic filter
AH128449	Hydraulic Filter Component	Hydraulic filter
HF7068	Hydraulic, Cartridge	Hydraulic filter
LSILS2.L53	LIMIT SWITCHES, ACTUATOR	Limit switches actuator
72501532	Lube, Full-Flow Spin-On	Oil filter
836647133	Lube, Spin-On	Oil filter
LF3783	Lube	Oil filter
RE57394	ENGINE OIL FILTER	Oil filter
09742	Bottom out muffler with exhaust clamp, muffler bracket, pipe and hardware. 1-5/16" O.D.	Service part / kit
09743	Side out, front outlet muffler with exhaust clamp, muffler bracket and hardware. 1" O.D.	Service part / kit
14-10	Quarter Turn Latches with Long Housing	Service part / kit
14-11	FLUIDS AND PRESSURE	Service part / kit
14-12	FUELS	Service part / kit
14-13	2/8"-16 x 1-1/4" Screw (Taptite) (Item 11)	Service part / kit
14-14	Starter Cover (Item 12)	Service part / kit
14-15	Crankease Wrapper (Item 13)	Service part / kit
14-16	Snap Bushing (Item 14)	Service part / kit
14-17	Rubber Grommet (Item 15)	Service part / kit
14-18	Gearcase Cover Screws	Service part / kit
14-2	Disassembly and Assembly of General Parts Oil Seals O-Tags Bearings	Service part / kit
14-20	Oil Fill Plug (Item 18)	Service part / kit
14-22	No. 2 Cylinder Ground Wire (Item 20)	Service part / kit
14-23	Foam Tape (Item 21)	Service part / kit
14-24	No. 1 Cylinder Ground Wire (Item 22)	Service part / kit
14-25	Oil Drain Decal (Item 23)	Service part / kit
14-3	Lock plates Split pins and spring pins	Service part / kit
14-4	M5 x 10mm Screw (Item 3)	Service part / kit
14-5	No. 2 Cylinder Wrapper (Item 4)	Service part / kit
14-7	No. 1 Cylinder Wrapper (Item 5)	Service part / kit
14-8	Barrel Wrapper (Item 6)	Service part / kit
14-9	M6-1.00 x 12mm Capscrew (Item 7)	Service part / kit
75252	Carburetor Overhaul Kit	Service part / kit
14-19	O-Ring (Item 17)	Seal
14-21	Spark Plug Boot (Item 19)	Spark plug
R45S	Spark Plug (AC)	Spark plug
RC12YC	Spark Plug	Spark plug
AN500T0122	STARTER MOTOR - Aftermarket Manufacture	Starter
AN500T0127	STARTER MOTOR	Starter
AN500T0168	STARTER DRIVE	Starter
AN500T0169	STARTER DRIVE	Starter
AN500T0171	STARTER DRIVE	Starter
LBCUM8.3TL2388	2388 ASN 273000 w/ 8.3 Turbo Engine Reman Longblock Assembly	Turbocharger

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 V-Twin?

The Generac V-Twin engine has an oil capacity of 1.65 liters.

What is the displacement of the Generac V-Twin?

The Generac V-Twin has a displacement of 0.48 liters with 2 cylinders.

Which generators use the Generac V-Twin engine?

The Generac V-Twin powers 7 generator set(s), including Generac 9592, Generac 9600, Generac 9734, Generac 9735, Generac NP52G.

How often should you change the oil in the Generac V-Twin?

The Generac V-Twin oil change interval is every 50 hours.

What is a common problem with the Generac V-Twin engine?

A commonly reported issue on generators using the Generac V-Twin is: Bottom out.