Blue Line Rear Axle / Output Shaft for 139QMB 50cc | 133mm Honda XR100 GY6-B 170-200cc models ZNEN GY6

GY6-B 170-200cc models ZNEN GY6 125cc/150cc models

Spline Count: 9

This kit is a 27% upgear from the stock 13*40 gear set

holds low gear longer)

please see our GY6-specific NCY springs

Blue Line Rear Axle / Output Shaft for 139QMB 50cc | 133mm Honda XR100 GY6-B 170-200cc models ZNEN GY6A replacement rear axle (also called output shaft or final drive shaft) for 139QMB based 50cc 4 stroke scooter engines. Fits Chicago Scooter Company go, go MAX, Bella Classic 50, Pug 50, and Nitro Sport 50, as well as any scooter running a 139QMB or compatible engine code. SKU: 151 55. Direct OEM replacement rear axle output shaft final drive shaft 20 spline ends for positive gear engagement Fits 139QMB and compatible 50cc 80cc 4 stroke engine codes