Repair Slipping Drive Gear on 49cc, 66cc or 80cc Bicycle Motor

My friend's motor stopped getting compression and we noticed that the drive gear was slipping on the crank shaft. Since nobody else has made a video of how to resolve this, we decided to make a video of ourselves learning how to fix the problem.
We bought a replacement Woodruff key from a local big box auto parts store, but I strongly recommend buying the correct key for a few bucks from eBay by searching for "49cc woodruff key". Additionally, the gear puller can be had for just a few bucks from eBay by searching for "49cc clutch puller".
This looks like a complicated and difficult process, but it isn't. It does, however, require a lot of patience.

Видео Repair Slipping Drive Gear on 49cc, 66cc or 80cc Bicycle Motor канала SAPLSMW