GY6 50cc (139QMB) Transmission Case Gasket

Transmission Case Gasket for CSC Scooters

This gearbox case gasket is meant to swap out a worn or damaged seal on several CSC scooter models. Compatible models include the go, go MAX, Bella Classic, Pug 50, and Nitro Sport 50. To keep your scooter running as it should, consider this among the GY6 50cc scooter parts available. Replacing the gasket on schedule helps stop leaks and keeps the transmission working properly.

Compatibility with 139QMB Engines

This gasket is designed for a range of 50cc and 80cc engines, especially those marked with the 139QMB engine designation. It applies to many models, so it should sit correctly on your scooter. If your engine identification contains "QM" or "FM," this gasket is most likely the right choice.

When to Replace Your Gasket

Heat and pressure gradually wear gaskets down, which can cause leaks at the transmission case. Check it regularly, particularly if fluid appears under your scooter. Replacing a worn gasket promptly can prevent further engine problems.

Specifications

• Color: May vary
• Fits: GY6 50cc (139QMB) gearbox and CSC Bella Classic 50, Go Max, Nitro Sport 50 and Pug 50 gearboxes
• OEM Part Number: 139QMB

Fitment

Fits:

• GY6 50cc (139QMB) (139QMB / QMB139 gearbox case)
• Chicago Scooter Company Bella Classic 50
• Chicago Scooter Company Go Max
• Chicago Scooter Company Nitro Sport 50
• Chicago Scooter Company Pug 50

How to choose: Compare the old gasket with the case mating surfaces, since the outline, bolt holes and passage openings must line up.

Where it goes: part #12 on the gear box diagram for the GY6 50cc (139QMB), CSC Go; part #12 on the gear box diagram for the CSC Bella Classic 50; part #12 on the gear box diagram for the CSC Go Max.

Shop more: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter Gaskets & Seals · Scooter Transmission & Final Drive · Scooter Parts