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Honda V-Twin Vertical OHV Engine with Electric Start — 660cc, GXV Series, 1 1/8in. x 3.8in. Shaft, Model# GXV660RTAF
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Honda V-Twin Vertical OHV Engine with Electric Start — 660cc, GXV Series, 1 1/8in. x 3.8in. Shaft, Model# GXV660RTAF

Item# 166126
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Only $1299.99

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Ships Truck 110.0 lbs
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Manufacturer's Warranty: 3 year limited warranty

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Product Summary

With experience born on the raceways and roadways and a dedication to innovation, there's plenty of reasons to insist on the new Honda GX660 V-Twin engine. There's superior engine design, with a 90° configuration that reduces vibration and allows a compact footprint. There's superior construction, with a forged steel crankshaft and an integrated cylinder head. Fewer parts means better durability. There's a digital CDI ignition coil that ensures improved fuel economy and lowered emissions. There's even improved air cleaning, meaning that you can wait 5 times longer between filter changes. Honda even gives their engines a 3-year limited warranty.

What's Included

  •  (1) Engine, Model# GXV660RTAF

Features + Benefits

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  • Full pressure lubrication system
  • Forged steel connecting rod
  • Mechanical governor system
  • 50-state compliant engine

Key Specs

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Item#166126
Ship Weight110.0 lbs
Engine Displacement (cc)660
Start TypeElectric
Engine TypeAir cooled
Rated Power (HP)21
Torque (ft./lbs.)35.2
Shaft OutputVertical
Crankshaft1 1/8 x 3.8
Shaft Diameter (in.)1 1/8
Shaft Length (in.)3.8
Shaft Rotation (From PTO Shaft Side)Counterclockwise
Cylinders (qty.)2
Bore x Stroke (in.)3.1 x 2.8
Compression Ratio9.3 : 1
Air Cleaner TypeDual element
Oil Capacity (qt.)2.3
Lubrication SystemFull pressure
Ignition SystemDigital CDI
Governor SystemMechanical
Carburetor2-barrel, fuel cut solenoid, inner vent
Bolt Circle (in.)7 3/4
EPA/CARB Approval (California Air Resource Board)Yes

Additional Information

Dimensions and Performance Curve

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Extended Warranty

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Service Protection Plus

Manufacturer Warranty:
3 year limited warranty

Protect your purchase beyond the manufacturer's warranty
with Service Protection Plus!

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Honda V-Twin Vertical OHV Engine with Electric Start — 660cc, GXV Series, 1 1/8in. x 3.8in. Shaft, Model# GXV660RTAF The price is $1,299.99.
Honda V-Twin Vertical OHV Engine with Electric Start — 660cc, GXV Series, 1 1/8in. x 3.8in. Shaft, Model# GXV660RTAF
(Not Yet Rated - New)
Item# 166126
In Stock Online
Only $1299.99
(Not Yet Rated - New)
Item# 44368
In Stock Online
Only $1499.99
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Engine Displacement (cc)
160 160 340 660 688
Start Type
Recoil Recoil Electric w/recoil backup Electric Electric
Application Walk-behind mower, chipper/vac Walk-behind mower Commerical turf equipment, lawn tractor, riding mower - Commercial lawn equipment, construction/small vehicle
Engine Type GCV series OHV commercial-duty GXV series OHV commercial-duty GXV series OHV commercial-duty Air cooled GX series OHV commercial-duty
Rated Power (HP) 4.4 4.3 8.9 21 -
Torque (ft./lbs.)
6.9 @ 2,500 RPM 7.10 at 2,500 RPM 15.90 @ 2,500 RPM 35.2 35.6 @ 2,500 RPM
Shaft Output
Vertical Vertical Vertical Vertical Vertical
Crankshaft N1 type - - 1 1/8 x 3.8 1 1/8 x 3 51/64
Shaft Diameter (in.) 7/8 7/8 1 1 1/8 1 1/8
Shaft Length (in.) 3 5/32 3 1/16 3 1/8 3.8 3 51/64
Shaft Keyway (in.)
3/16 - 1/4 - 1/4
Shaft End Tapped (Diameter (in.)/Threads per inch) 3/8–24 7/8–24 7/16–20 - 7/16-20
Shaft Rotation (From PTO Shaft Side) Counterclockwise Counterclockwise Counterclockwise Counterclockwise Counterclockwise
Bearing Type
- - - - Ball bearing
Cylinders (qty.)
1 1 1 2 2
Cylinder Bore
Aluminum alloy Cast iron Cast iron - Cast iron
Bore x Stroke (in.)
2.5 x 2.0 2.7 x 1.8 3.2 x 2.5 3.1 x 2.8 3 1/16 x 2 13/16
Compression Ratio
8.5:1 8.0:1 7.7:1 9.3 : 1 9.3:1
Cooling System
Air cooled Air cooled Air cooled - Air cooled
Air Cleaner Type
Dry (paper) type Dual element Dual element Dual element Dual element
Fuel Tank Yes Yes Yes - -
Fuel Type Gasoline Gasoline Gasoline - Gasoline
Fuel Tank Capacity (qt.) 0.98 1.9 2.2 - -
Fuel Pump
- - - - Yes
Fuel Filter
- - Mesh fuel filter - Yes
Oil Capacity (qt.)
0.58 0.69 1.2 2.3 2.3
Lubrication System
Forced splash Forced splash Pressure/splash Full pressure Forced lubrication
Low Oil Alert
- - No - Oil pressure switch
Low Oil Shutdown
- - - - Oil pressure switch
Ignition System
Electronic Electronic Electronic Digital CDI Digital CDI
Governor System
Centrifugal mechanical Centrifugal mechanical Centrifugal mechanical Mechanical Mechanical
Carburetor
Float Float Float 2-barrel, fuel cut solenoid, inner vent 2 barrel, fuel-cut solenoid, inner vent
Throttle Control
Manual Manual Remote (wire) - Remote (rod)
Choke Control
Remote (wire) Remote (wire) Remote (wire) - Remote (rod)
Max. RPM
3,600 3,600 3,600 - 3,600
Charging System Amps - - 3 - 17
Muffler Included
Yes Yes Yes - No
Flywheel Brake Yes Yes - - -
Auto Compression Release
- Yes - - Yes
Bolt Circle (in.)
8 1/2 8 10 7 3/4 7 3/4
Dimensions L x W x H (in.)
14 3/8 x 13 x 13 13/16 16 5/16 x 14 1/8 x 13 7/8 17 x 15 x 15 7/8 - 16 x 18 x 18
EPA/CARB Approval (California Air Resource Board)
Yes Yes Yes Yes Yes