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Honda V-Twin Horizontal OHV Engine with Electric Start — 688cc, GX Series, 1in. x 2 29/32in. Shaft, Model# GX630RHQZB3

Item# 43824
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Honda V-Twin Horizontal OHV Engine with Electric Start — 688cc, GX Series, 1in.  x 2 29/32in. Shaft, Model# GX630RHQZB3

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  • 900 configuration reduces vibration and allows a compact footprint
  • Forged steel crankshaft and integrated cylinder head
  • Fewer parts for better durability
  • Digital CDI ignition coil ensures improved fuel economy and lowered emissions
  • Improved air cleaning for filter change intervals that are five times longer
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Product Summary

This Honda V-Twin Horizontal OHV Engine's superior design has a 900 configuration that reduces vibration and allows a compact footprint. It also has a forged steel crankshaft and an integrated cylinder head. Fewer parts means better durability. The digital CDI ignition coil ensures improved fuel economy and lowered emissions. It also has improved air cleaning, meaning that you can wait five times longer between filter changes.

What's Included
  •  (1) Engine, Model# GX630RHQZB3

Features + Benefits

  • 900 configuration reduces vibration and allows a compact footprint
  • Forged steel crankshaft and integrated cylinder head
  • Fewer parts for better durability
  • Digital CDI ignition coil ensures improved fuel economy and lowered emissions
  • Improved air cleaning for filter change intervals that are five times longer
  •  Oil filter is parallel to crankshaft
Key Specs
Item# 43824
Brand Honda Engines
Manufacturer's Warranty 3 year limited warranty
Ship Weight 110.0 lbs
Engine Displacement (cc) 688
Start Type Electric
Application Concrete saw, pressure washer, chipper/shredder, trencher, vibratory roller
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 Q-type
Shaft Diameter (in.) 1
Shaft Length (in.) 2 29/32
Shaft Keyway (in.) 1/4, (Key size 6.3mm x 50mm)
Shaft End Tapped (Diameter (in.)/Threads per inch) 3/8-24
Shaft Rotation (From PTO Shaft Side) Counterclockwise
PTO Height (in.) 5 1/4
Bearing Type Ball
Cylinders (qty.) 2
Cylinder Bore Cast iron
Bore x Stroke (in.) 3.1 x 2.8
Compression Ratio 9.3:1
Cooling System Air cooled
Air Cleaner Type Dual element
Fuel Tank Not included
Fuel Type Gasoline
Fuel Pump Boost type
Fuel Filter Yes
Oil Capacity (qt.) 2.1
Lubrication System Forced lubrication
Low Oil Alert Yes
Low Oil Shutdown Oil Alert
Ignition System Electrical, 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 17
Muffler Included 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 7/8 x 16 1/8 x 17 3/16
EPA/CARB Approval (California Air Resource Board) Yes

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High-Mount Muffler for Honda V-Twin Engines — Fits GX630, 660 and 690 Engines, Right/Oil Filter Side Mount, Model# MUF-0560.SIL
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Estimated Delivery: 5 - 7 Business Days
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High-Mount Muffler for Honda V-Twin Engines — Fits GX630, 660 and 690 Engines, Left/Starter Side Mount, Model# MUF-0560R.SIL
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Item# 601105
Factory Shipped —
Estimated Delivery: 5 - 7 Business Days
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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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Honda V-Twin Horizontal OHV Engine with Electric Start — 688cc, GX Series, 1in.  x 2 29/32in. Shaft, Model# GX630RHQZB3 The price is $1,299.99.
Honda V-Twin Horizontal OHV Engine with Electric Start — 688cc, GX Series, 1in. x 2 29/32in. Shaft, Model# GX630RHQZB3
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Hide Similarities
Engine Displacement (cc)
688 688 688 688 688
Start Type
Electric Electric, shift type Electric, shift type Electric Electric
Application Concrete saw, pressure washer, chipper/shredder, trencher, vibratory roller 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 Pressure washer, lawn/garden equipment, generator, small vehicle, water pump Grain auger/elevator, pressure washer, semi-trailer w/power pack
Engine Type 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 GX series OHV V-Twin
Net Power Output (HP) 20.8 (15.5 kW) at 3,600 RPM 21.5 (16.0 kW) at 3,600 RPM 21.5 (16.0 kW) at 3,600 RPM 22.1 (16.5 kW) at 3,600 RPM 22.1 (16.5 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 Q-type T type T type T type T type
Shaft Diameter (in.) 1 1 1/8 1 1/8 1 1/8 1 1/8
Shaft Length (in.) 2 29/32 3 31/32 3.55 2 29/32 3.55
Shaft Keyway (in.)
1/4, (Key size 6.3mm x 50mm) 1/4, (Key size 6.3mm x 70mm) 1/4, (Key size 6.3mm x 70mm) 1/4 (key size 6.3mm x 70mm) 1/4 (key size 6.3mm x 70mm)
Shaft End Tapped (Diameter (in.)/Threads per inch) 3/8-24 7/16–20, UNF2B 7/16–20, UNF2B 7/16–20, UNF2B 7/16–20, UNF2B
Shaft Rotation (From PTO Shaft Side) Counterclockwise Counterclockwise Counterclockwise Counterclockwise Counterclockwise
PTO Height (in.) 5 1/4 5 1/4 5 1/4 5 1/4 -
Bearing Type
Ball - - Ball bearing Ball bearing
Cylinders (qty.)
2 2 2 2 2
Cylinder Bore
Cast iron Integrated Integrated Integrated Integrated
Bore x Stroke (in.)
3.1 x 2.8 3.1 x 2.8 3.1 x 2.8 78 x 72 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 Dual element
Fuel Tank Not included Not included Not included No No
Fuel Type Gasoline Gasoline Gasoline Gas Gas
Fuel Pump
Boost type Boost type Boost type Boost type Boost type
Fuel Filter Yes - - Fuel strainer -
Oil Capacity (qt.)
2.1 2 2 2.1 2
Lubrication System
Forced lubrication Full pressure Full pressure Forced lubrication Full pressure
Low Oil Alert
Yes Yes - No Yes
Low Oil Shutdown
Oil Alert - - 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 Electrical, digital CDI w/variable ignition timing Electrical, 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 Horizontal, two-barrel butterfly valve, internal vent (2) Barrel, fuel cut solenoid, inner vent
Throttle Control
Manual Manual Remote (wire) Remote Manual
Choke Control
Manual Manual Remote (wire) Remote Manual
Max. RPM
3,600 3,600 3,600 3,600 3,600
Charging System Amps 17 20 20 20 20
Muffler Included
No Not included Not included No No
Flywheel Brake
- No No No No
Auto Compression Release Yes - - 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.)
15 7/8 x 16 1/8 x 17 3/16 15 7/8 x 16 1/8 x 17 3/16 15 7/8 x 16 1/8 x 17 3/16 15 9/10 x 16 1/10 x 17 1/5 16 x 18 x 18
EPA/CARB Approval (California Air Resource Board)
Yes Yes Yes Yes Yes