50cc 4-Stroke Auto-Clutch Electric Start Honda-Clone ATV Engine

This 50cc 4-stroke auto-clutch Honda-clone engine has electric start and no reverse. It comes with the chain cover, carburetor joint (intake manifold extension), gaskets, O-ring and carburetor mounting hardware.

Honda-clone engines are used in many ATVs, dirt bikes, pit bikes, go-karts and dune buggies. This engine replaces many Chinese-made factory 50cc ATV and dirt bike engines from makers such as Baja Motorsports, Coolster, Motovox, Roketa and TaoTao.

Please note: The exhaust port has a machined cut-out on one side to receive a collared exhaust pipe. This is by design and is not a defect. The collared pipe fits down into the port, with the diamond-shaped flange fitting over the studs.

The included elbow-shaped carburetor joint holds the carburetor at the proper angle and away from the engine head. Although the exhaust port uses the same stud spacing as the intake, this joint does not work on the exhaust because of the cut-out.

There are many versions of 50cc 4-stroke engines on the market. Check the detailed specifications and dimensions before ordering.

Style: 139FMA
Engine Type: Single Cylinder 4-Stroke
Cooling: Air Cooled
Displacement: 48cc
Bore and stroke (mm): 38.8/41.4
Compression Ratio: 7.2:1
Max Power (kw/RPM): 2.0/7500
Max Torque (N.m/RPM): 3.0/7500
Nominal Power/Speed (kw/RPM): 2/7000 ±500
No Load Speed (RPM): 1500 ±100
Spark Plug: A7TC
Spark Plug Gap (mm): 0.6-0.7
Starting: Electric starter motor
Lower Engine Mounts: 11cm
Lower Mounting Bracket Through Hole Diameter: .04"
Center to Center Exhaust Mounting Bolts: 50mm
Lower Secondary Mounting Bracket: 108mm
Lower Secondary Mounting Bracket Through Hole Diameter: .337"
Upper Engine Mount Through Hole Diameter: .315"
Overall Length: 25"
Width: 13.5"
Height From Bottom Mounting Bracket to Top Air Intake: 11.25"
Treaded Drive Shaft: 3cm
Weight: 42.40lbs