If you look closely at the pics above you can see that I just mounted a standard 4-stroke engine mounting plate to the seat tube with 3 small muffler type clamps. There are 2 pillow block bearings that support the 5/8" jackshaft with the secondary drive sprocket on the left side of the bike (that's inboard) with the secondary drive sprocket outboard. On the right hand side of the 5/8" jackshaft is a small brake disc that has a mechanical disc brake caliper to provide rear braking to the bike.
If you follow another build I did of a 99cc predator in a Dyno frame, you can see the 5/8" jackshaft build that is very much the same as My 212cc Pred build here.
Here is a link: http://motorbicycling.com/showthread.php?t=44847
