Complete 4-stroke 50cc engine for CSC go, go MAX, Bella Classic, Nitro Sport, Pug 50, and other 50cc 139QMB gas scooter engines with automatic CVT transmission and rear drum brakes. Includes electric starter, kick start, and CVT. Brake shoes not included.

This scooter engine is designed specifically for use with 10" diameter rear rims. This corresponds to a tire size of 2.75-10 through 3.50-10. Please be sure your rear tire diameter falls within the range of these sizes.

This engine is shipped dry and includes 1 Liter of Bel-Ray Gear Saver Hypoid Oil and 1 Liter of Bel-Ray Engine Oil. DO NOT RUN ENGINE WITHOUT ADDING SPECIFIED AMOUNTS OF OIL.

Original Parts For Scooters SKU 220-40

Specifications:

• Output Shaft Length: 54mm  
• CVT Cover (short case): 16 inches  
• Set up for drum brake  
• Set Up for PAIR Emissions System
• 69mm Valves
• 8 Pole A/C Stator
• Includes Premium Bando Drive Belt & NGK Spark Plug  
• Engine Oil: 0.8 Liters
• Gear Oil: 0.12 Liters (filling) and 0.10 Liters (changing)
• Engine type: Single Cylinder 4-Stroke
• Cooling: Air Cooled
• Displacement: 49cc
• Bore Stroke(mm): 39 X 41.5
• Max Power (kw/rpm): 2.3/7500
• Max Torque (N-m/rpm): 3.2/6500
• Min Unload Stable Rotation (rpm): 1600 +/- 100
• Starting: Electric/kick

Compatibility:

139QMB-based 50cc / 80cc engines with the following engine codes:

Don't see your engine listed? If the engine code includes "QM" or "FM", this product is compatible with your vehicle.

About Scooterworks: Since our beginning in 1989, Scooterworks has become a major supplier of parts and accessories for vintage and modern scooters. We have everything you need, from wear-and-tear items like tires and oil filters to after-market parts from brands like Malossi, NCY, Prima, YSS, Dr. Pulley, and more.

Please choose carefully! Scooterworks now has a firm no return policy on engines, barring manufacture defects or shipping damage.

Product is intended as OEM equivalent for listed models. Any misuse, alteration or alternative application is prohibited by law.

This product is not available for international or expedited shipping and will ship only via U.S. domestic ground. This product can only be shipped to the contiguous United States (lower 48 states and D.C.). International orders and orders bound for Alaska, Hawaii, or Puerto Rico for this item will be canceled.