Engine, Complete - 50cc GY6 50cc (139QMB) Scooters - Short Case

Full 50cc Engine Replacement for CSC Scooters and Similar Models

This complete 50cc unit suits CSC scooters including the go, go MAX, Bella Classic, and Nitro Sport. It is a 4-stroke, single-cylinder engine with an automatic CVT gearbox. Among our GY6 50cc scooter parts, it is a good pick for riders who want to swap out a worn engine or carry out major service work.

Engine Details

The engine is built for scooters with a 10-inch rear wheel, with tire sizes running from 2.75-10 up to 3.50-10. Both electric start and kick start are included, so you have a backup way to fire it up in different conditions. It ships dry, so you will need to add 1 Liter each of engine oil and gear oil before the first run.

Output and Torque

The output shaft measures 54mm and the CVT cover is 16 inches, which sets the engine up for a drum brake layout. Peak output is 2.3 kW at 7500 rpm, and peak torque is 3.2 N-m at 6500 rpm. A premium drive belt and an NGK spark plug are fitted as standard.

Specifications

• Engine Type: Single Cylinder 4-Stroke
• Cooling: Air Cooled
• Displacement: 49cc
• Max Power: 2.3 kW / 7500 rpm
• Max Torque: 3.2 N-m / 6500 rpm
• Engine Oil Capacity: 0.8 Liters
• Gear Oil Capacity: 0.12 Liters (filling), 0.10 Liters (changing)
• Fits: CSC go, go MAX, Bella Classic and Nitro Sport 50cc

Compatibility

Compatible with:

• CSC go 50
• CSC go MAX 50
• CSC Bella Classic 50
• CSC Nitro Sport 50
• 139QMB-based 50cc and 80cc engines (engine codes 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, 147QMD, other QMA and QMB models)

Choosing the right fit: Confirm your rear tire fits the 10-inch rim within the 2.75-10 to 3.50-10 range, and check that the engine code on your scooter contains "QM" or "FM".

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