My Honda trx350 foreman 4 wheeler was blowing a lot of smoke so I stripped it down and found a badly scored bore and worn stem seals. Thought I'd make a vid for anyone looking to fix their smokey motor. The process is similar with most small air cooled 4 strokes.

Took about 6 hours to do the work and cost around $140 for parts, fairly simple job for anyone with a good tool kit and mechanical skills.