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Honda V-Twin Horizontal OHV Engine with Electric Start — 688cc, GX Series, 1 1/8in. x 3 7/8in. Shaft, Model# GX630RHTXF2

Item# 44376
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Honda V-Twin Horizontal OHV Engine with Electric Start — 688cc, GX Series, 1 1/8in. x 3 7/8in. Shaft, Model# GX630RHTXF2

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Only $1299.99
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  • 900 configuration reduces vibration and allows a compact footprint
  • Superior construction with 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 five times longer periods between filter changes
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Product Summary

There's plenty of reasons to insist on the Honda V-Twin Horizontal OHV Engine with Electric Start. It has a 900 configuration that reduces vibration and allows a compact footprint. It also has superior construction, with forged steel crankshaft and integrated cylinder head. Fewer parts means better durability. The digital CDI ignition coil ensures improved fuel economy and lowered emissions. It even has improved air cleaning, meaning that you can wait five times longer between filter changes.

What's Included
  •  (1) Engine

Features + Benefits

  • 900 configuration reduces vibration and allows a compact footprint
  • Superior construction with 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 five times longer periods between filter changes
Key Specs
Item# 44376
Brand Honda Engines
Manufacturer's Warranty 3 year limited warranty
Ship Weight 110.0 lbs
Engine Displacement (cc) 688
Start Type Electric
Application Stump grinder, concrete saw, 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 T type
Shaft Diameter (in.) 1 1/8
Shaft Length (in.) 3 7/8
Shaft Keyway (in.) 1/4
Shaft End Tapped (Diameter (in.)/Threads per inch) 7/16-20 UNF2B TAP
Shaft Rotation (From PTO Shaft Side) Counterclockwise
PTO Height (in.) 5 1/4
Bearing Type Ball bearing
Cylinders (qty.) 2
Cylinder Bore Cast iron
Bore x Stroke (in.) 3 1/16 x 2 27/32
Compression Ratio 9.3:1
Cooling System Air cooled
Air Cleaner Type Requires DNLS5 air cleaner (not included)
Fuel Tank Not included
Fuel Type Gasoline
Fuel Pump Boost type
Oil Capacity (qt.) 2.1
Lubrication System Forced lubrication
Low Oil Alert Oil level indicator
Low Oil Shutdown Oil level indicator
Ignition System Digital CDI w/variable timing
Governor System Mechanical
Carburetor Horizontal, two-barrel butterfly valve, internal vent
Throttle Control Remote (rod)
Choke Control Remote (rod)
Max. RPM 3,600
Charging System Amps 20
Muffler Included Not included
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 9/10 x 16 1/10 x 17 11/5
EPA/CARB Approval (California Air Resource Board) Yes

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Mufflers

High-Mount Muffler for Honda V-Twin Engines — Fits GX630, 660 and 690 Engines, Right/Oil Filter Side Mount, Model# MUF-0560.SIL
High-Mount Muffler for Honda V-Twin Engines — Fits GX630, 660 and 690 Engines, Right/Oil Filter Side Mount, Model# MUF-0560.SIL
Item# 601099
Factory Shipped —
Estimated Delivery: 5 - 7 Business Days
Only $139.99
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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
High-Mount Muffler for Honda V-Twin Engines — Fits GX630, 660 and 690 Engines, Left/Starter Side Mount, Model# MUF-0560R.SIL
Item# 601105
Factory Shipped —
Estimated Delivery: 5 - 7 Business Days
Only $139.99
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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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Hide Similarities
Engine Displacement (cc)
688 688 688 688 688
Start Type
Electric start Electric Electric, shift type Electric Electric
Application Concrete saw, pressure washer, chipper/shredder, trencher, vibratory roller, ride-on cement trowel Stump grinder, concrete saw, chipper/shredder, trencher, vibratory roller 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 20.8 (15.5 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 7/8 3.55 2 29/32 3.55
Shaft Keyway (in.)
1/4, (Key size 6.3mm x 50mm) 1/4 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, UNF2B 7/16-20 UNF2B TAP 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 bearing - Ball bearing Ball bearing
Cylinders (qty.)
2 2 2 2 2
Cylinder Bore
Integrated Cast iron Integrated Integrated Integrated
Bore x Stroke (in.)
3.1 x 2.8 3 1/16 x 2 27/32 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/cylindrical Requires DNLS5 air cleaner (not included) 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 - - - Fuel strainer -
Oil Capacity (qt.)
2 2.1 2 2.1 2
Lubrication System
Full pressure Forced lubrication Full pressure Forced lubrication Full pressure
Low Oil Alert
Yes Oil level indicator - No Yes
Low Oil Shutdown
- Oil level indicator - No No
Ignition System
Electonic, digital CDI w/variable ignition timing Digital CDI w/variable 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 Horizontal, two-barrel butterfly valve, internal 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 Remote (rod) Remote (wire) Remote Manual
Choke Control
Manual Remote (rod) Remote (wire) Remote Manual
Max. RPM
3,600 3,600 3,600 3,600 3,600
Charging System Amps 2.7 20 20 20 20
Muffler Included
Not included 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 9/10 x 16 1/10 x 17 11/5 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