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Honda V-Twin Horizontal OHV Engine with Electric Start – 688cc, GX Series, 5/16in. – 24 tap x 3in. taper, Model# GX630RVZA

Item# 55396
Honda V-Twin Horizontal OHV Engine with Electric Start – 688cc, GX Series, 5/16in. – 24 tap x 3in. taper, Model# GX630RVZA

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Only $1299.99
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  • Generator tapered shaft; 24 x 3in. taper
  • 688cc air-cooled, 4-stroke OHV engine with electric start
  • Improved air cleaning allows you to wait 5 times longer between filter changes
  •  Digital CDI ignition coil ensures improved fuel economy and lowered emissions
  • 50-state compliant engine
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Product Summary

The Honda V-Twin Horizontal OHV Engine with Electric Start displays years of dedication to innovation, giving you plenty of reasons to insist on the new Honda GX630 V-Twin model. 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. Ideal for use with generators.

What's Included
  • (1) Engine, Model# GX630RVZA

Features + Benefits

  • Generator tapered shaft; 24 x 3in. taper
  • 688cc air-cooled, 4-stroke OHV engine with electric start
  • Improved air cleaning allows you to wait 5 times longer between filter changes
  •  Digital CDI ignition coil ensures improved fuel economy and lowered emissions
  • 50-state compliant engine
Key Specs
Item# 55396
Brand Honda Engines
Manufacturer's Warranty 3 year limited warranty
Ship Weight 110.0 lbs
Engine Displacement (cc) 688
Start Type Electric
Application Generator
Engine Type GX series OHV V-Twin commercial-duty
Net Power Output (HP) 20.8 (15.5 kW) at 3,600 RPM
Net Torque (lbs./ft.) 35.6 (48.3 Nm) at 2,500 RPM
Shaft Output Horizontal
Crankshaft V-type
Shaft Diameter (in.) Tapered
Shaft Length (in.) 3
Shaft End Tapped (Diameter (in.)/Threads per inch) 5/16–24, UNF2B
Shaft Rotation (From PTO Shaft Side) Counterclockwise
Gear Reduction No
PTO Height (in.) 5 1/4
Bearing Type Ball bearing
Cylinders (qty.) 2
Cylinder Bore Integrated
Bore x Stroke (in.) 3.1 x 2.8
Compression Ratio 9.3:1
Cooling System Air cooled
Air Cleaner Type Dual element/cylindrical
Fuel Tank Not included
Fuel Type Gasoline
Fuel Pump Boost type
Fuel Filter Yes
Oil Capacity (qt.) 2
Lubrication System Full pressure
Low Oil Alert Yes
Low Oil Shutdown No
Ignition System Electonic, digital CDI w/variable ignition timing
Governor System Mechanical
Carburetor 2-barrel, fuel cut solenoid, inner vent
Throttle Control Manual
Choke Control Manual
Max. RPM 3,600
Charging System Amps 2.7
Muffler Included No
Flywheel Brake No
Auto Compression Release Yes
Bolt Circle (in.) 5, 6 1/2, 7 3/4
Mounting Base L x W (in.) 7 11/16 x 3 25/64–4 21/32
Dimensions L x W x H (in.) 15.875 x 16.125 x 17.187
EPA/CARB Approval (California Air Resource Board) Yes
Product Weight (lbs.) 110

Customer Reviews

Product Question + Answer
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Replacement Parts
Call To Order: 1-800-657-0516

Mon - Fri 7:00 AM - 6:00 PM (Central)
Sat 7:00 AM - 3:00 PM (Central)

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Item# 55396
Honda V-Twin Horizontal OHV Engine with Electric Start – 688cc, GX Series, 5/16in. – 24 tap x 3in. taper, Model# GX630RVZA The price is $1,299.99.
Honda V-Twin Horizontal OHV Engine with Electric Start – 688cc, GX Series, 5/16in. – 24 tap x 3in. taper, Model# GX630RVZA
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Engine Displacement (cc)
688 688 688 688 688
Start Type
Electric Electric, shift type Electric Electric, shift type Electric start
Application Grain auger/elevator, pressure washer, semi-trailer w/power pack Lawn tractor, mower, utility vehicle, concrete saw, pressure washer, chipper/shredder, trencher, vibratory roller, ride-on cement trowel Generator Concrete saw, pressure washer, chipper/shredder, trencher, vibratory roller, ride-on cement trowel Concrete saw, pressure washer, chipper/shredder, trencher, vibratory roller, ride-on cement trowel
Engine Type GX series OHV V-Twin GX series OHV V-Twin commercial-duty GX series OHV V-Twin commercial-duty GX series OHV V-Twin commercial-duty GX series OHV V-Twin commercial-duty
Net Power Output (HP) 22.1 (16.5 kW) at 3,600 RPM 21.5 (16.0 kW) at 3,600 RPM 20.8 (15.5 kW) at 3,600 RPM 20.8 (15.5 kW) at 3,600 RPM 20.8 (15.5 kW) at 3,600 RPM
Net Torque (lbs./ft.) 35.6 (48.3 Nm) at 2,500 RPM 35.6 (48.3 Nm) at 2,500 RPM 35.6 (48.3 Nm) at 2,500 RPM 35.6 (48.3 Nm) at 2,500 RPM 35.6 (48.3 Nm) at 2,500 RPM
Shaft Output
Horizontal Horizontal Horizontal Horizontal Horizontal
Crankshaft T type T type V-type Q-type Q-type
Shaft Diameter (in.) 1 1/8 1 1/8 Tapered 1 1
Shaft Length (in.) 3.55 3.55 3 2 29/32 2 29/32
Shaft Keyway (in.)
1/4 (key size 6.3mm x 70mm) 1/4, (Key size 6.3mm x 70mm) - 1/4, (Key size 6.3mm x 50mm) 1/4, (Key size 6.3mm x 50mm)
Shaft End Tapped (Diameter (in.)/Threads per inch) 7/16–20, UNF2B 7/16–20, UNF2B 5/16–24, UNF2B 3/8–24, UNF2B 3/8–24, UNF2B
Shaft Rotation (From PTO Shaft Side) Counterclockwise Counterclockwise Counterclockwise Counterclockwise Counterclockwise
Gear Reduction - - No - -
PTO Height (in.)
- 5 1/4 5 1/4 5 1/4 5 1/4
Bearing Type Ball bearing - Ball bearing - -
Cylinders (qty.)
2 2 2 2 2
Cylinder Bore
Integrated Integrated Integrated Integrated Integrated
Bore x Stroke (in.)
3.1 x 2.8 3.1 x 2.8 3.1 x 2.8 3.1 x 2.8 3.1 x 2.8
Compression Ratio
9.3:1 9.3:1 9.3:1 9.3:1 9.3:1
Cooling System
Air cooled Air cooled Air cooled Air cooled Air cooled
Air Cleaner Type
Dual element Dual element/cylindrical Dual element/cylindrical Dual element/cylindrical Dual element/cylindrical
Fuel Tank No Not included Not included Not included Not included
Fuel Type Gas Gasoline Gasoline Gasoline Gasoline
Fuel Pump
Boost type Boost type Boost type Boost type Boost type
Fuel Filter - - Yes - -
Oil Capacity (qt.)
2 2 2 2 2
Lubrication System
Full pressure Full pressure Full pressure Full pressure Full pressure
Low Oil Alert
Yes - Yes Yes Yes
Low Oil Shutdown No - No - -
Ignition System
Electrical, digital CDI w/variable ignition timing Electonic, digital CDI w/variable ignition timing Electonic, digital CDI w/variable ignition timing Electonic, digital CDI w/variable ignition timing Electonic, digital CDI w/variable ignition timing
Governor System
Mechanical Mechanical Mechanical Mechanical Mechanical
Carburetor
(2) Barrel, fuel cut solenoid, inner vent 2-barrel, fuel cut solenoid, inner vent 2-barrel, fuel cut solenoid, inner vent 2-barrel, fuel cut solenoid, inner vent 2-barrel, fuel cut solenoid, inner vent
Throttle Control
Manual Remote (wire) Manual Manual Manual
Choke Control
Manual Remote (wire) Manual Manual Manual
Max. RPM
3,600 3,600 3,600 3,600 3,600
Charging System Amps 20 20 2.7 17 2.7
Muffler Included
No Not included No Not included Not included
Flywheel Brake
No No No No No
Auto Compression Release - - Yes - -
Bolt Circle (in.)
5, 6 1/2, 7 3/4 5, 6 1/2, 7 3/4 5, 6 1/2, 7 3/4 5, 6 1/2, 7 3/4 5, 6 1/2, 7 3/4
Mounting Base L x W (in.)
7 11/16 x 3 25/64–4 21/32 7 11/16 x 3 25/64–4 21/32 7 11/16 x 3 25/64–4 21/32 7 11/16 x 3 25/64–4 21/32 7 11/16 x 3 25/64–4 21/32
Dimensions L x W x H (in.)
16 x 18 x 18 15 7/8 x 16 1/8 x 17 3/16 15.875 x 16.125 x 17.187 15 7/8 x 16 1/8 x 17 3/16 15 7/8 x 16 1/8 x 17 3/16
EPA/CARB Approval (California Air Resource Board)
Yes Yes Yes Yes Yes
Product Weight (lbs.) - - 110 - -