50cc Short Case 4-Stroke 139QMB Scooter Engine with Automatic CVT

Complete 50cc 4-stroke 139QMB gas scooter engine with automatic CVT transmission.

This complete, brand new replacement 50cc 4-stroke GY6 139QMB Chinese built engine is the perfect time and money saver. Instead of spending money for costly repairs to a tired 50cc 4-stroke GY6 or waiting for the repair shop, simply swap in this high quality 50cc 4-stroke GY6 139QMB gas scooter engine.

This complete engine includes electric starter, kick start, and CVT with cover as pictured.

For use with scooters & vehicles with rear drum brakes. Please note that the brake shoes (as shown in the photo above) are no longer included.

PLEASE NOTE:
There are many different versions of 50cc style 4-stroke engines used in the Chinese scooter 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 scooter prior to ordering!

This scooter engine is designed for use with 10" diameter rear rims. This would correspond to a tire size of 2.75-10 through 3.50-10. Please be certain your rear tire falls within the range of these sizes. This engine will not accommodate rear tires that are larger than 3.50-10.

⚠ WARNING California Residents: Proposition 65 Warning

Style: Shortcase
Engine type: Single Cylinder 4-Stroke
Cooling: Air Cooled
Displacement: 49cc
Bore & Stroke: 39 mm X 41.5 mm
Max Power: 2.3 kw/7500 rpm
Max Torque: 3.2 N-m/6500 rpm
Min Unload Stable Rotation (rpm): 1600 rpm +/- 100 rpm
Starting: Electric and kick