50cc ATV & Dirt Bike Engine

50cc 4-stroke automatic gas ATV and dirt bike engine.

This engine is used in a wide variety of applications, including all terrain vehicles (ATVs), dirt bikes, pit bikes, go karts, and dune buggies.

Predominantly used in the ATV and dirt bike industry.

PLEASE NOTE:
There are many different versions of 50cc GY6 style 4-stroke engines used in the Chinese scooter, all-terrain vehicle, dirt bike, and go kart market. Please be sure to check the detailed specifications and dimensions on our specifications page (tab titled "Specs") prior to ordering.

Please use these dimensions to verify that this engine will fit your ATV or bike prior to ordering!

It is Monster Scooter Parts company policy that all engine sales are final. Our entire return policy can be viewed at the link below:

Monster Scooter Parts Return Policy

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
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" (Not including kick starter)
Height From Bottom Mounting Bracket to Top Air Intake: 11.25"
Treaded Drive Shaft: 3cm
Weight: 42.40lbs