All new comers read this before you buy a 4 stroke kit

[Mike St]

If you want total quality buy a Grubee belt drive kit which uses bearings,
but it will be more expensive.

 

[Sidewinder Jerry]

Of course there's another 4 stroke option. One could also buy a Staton Inc kit. The 18.75:1 and 16.09:1 reduction gearboxes are the absolute strongest transmissions there is. They use gears instead of belts. My kit is 12 years old and still going strong.

Staton Inc