AHP 4 speed 1 down 3 up transmission, hardened gears and shift forks. This tranmission kit is made for those wanting to upgrade their stock Honda motors from a 3 speed to a 4 speed. AHP's transmission kit will work with both semi-auto and manual clutches and will fit into a OEM Honda bottom end. Will also fit import motors. Recommended for 50cc to 108cc engines.

Set comes complete with main shaft, counter shaft, shift drum and shift forks.

Primary reduction ratio: 3.722

Gear Ratio:

1 - 3.182
2 - 1.706
3 - 1.238
4 - 0.917