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A complete 49cc air-cooled four-stroke engine for 139QMB scooters with automatic CVT and rear drum brakes. It arrives with the CVT, electric and kick starters, a Bando belt and an NGK plug, so it is a drop-in replacement rather than a rebuild kit. The short CVT case and 54mm output shaft suit 10-inch rear rims with 2.75-10 to 3.50-10 tires. It fits CSC go, go MAX, Bella Classic and Nitro Sport models and other 139QMB scooters, and it is the practical choice for an owner whose original engine has failed rather than for someone chasing more power.
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This is a complete 4-stroke 50cc engine for 139QMB gas scooters with an automatic CVT transmission and rear drum brakes. It fits the CSC go, go MAX, Bella Classic and Nitro Sport, along with other 50cc 139QMB scooter engines. It comes with an electric starter, a kick start and the CVT. Brake shoes are not included.
The engine is designed for 10" diameter rear rims, which correspond to tire sizes 2.75-10 through 3.50-10. The rear tire diameter must fall within that range. It ships dry, so the specified amount of oil must be added before it is run. Running it without oil must be avoided.