Brake Master Cylinder - Front 612091 It is the most common

It is the most common belt used on short case GY6 50cc 139QMB scooters

Mounting holes on cover are 72mm (2

High performance

Routine Maintenance

Spline count on end of shaft: 21 teeth spline

Brake Master Cylinder - Front 612091 It is the most commonHandlebar Brake Master Cylinder for ATVs, Scooters Mopeds and Dirt Bikes. WITHOUT E brake This handlebar brake master cylinder is the replacement part for many Chinese atvs. This master cylinder fits many 50cc, 70cc, 90cc, 100cc, 110cc, and 125cc models. Master Cylinder description: Left side Universal 180mm lever Fits 7 8 inch Handlebar Without e brake Uses DOT3 or DOT 4 brake fluid Compatible with 50cc 125cc 4 stroke Need the right side? Here is the