Over the past couple months ive been working on this OCC Stingray project. This bike has been an incredible amount of fun to build and quite a lot of blood sweat and tears(as well as a few kicks and curses..)shed to make it a reality. I bought the bike as a functioning pedal bicycle off craigslist. Grabbed an old Tecumseh 3hp engine i had lying around and hit the drawing pad with one thing for certain, it was gunna be belt drive. Debate between CVT and centrifugal clutch was a long one, but i went CC for cost. The driven pulley was bought at a local ag store and is 14" in diameter. The final drive ratio is about 5:1 which kinda hinders take off, but just give a couple kicks and you're fine. The bike tops out at 42mph as of right now. The only thing about the engine that has been modified is the removal of the governor, factory cam, factory rods, factory diaphragm carb... 7.5:1 compression ratio. The driven pulley was mounted to the hub by two 10-24 stainless steel bolts and lock nuts spaced equally apart from each other and the spokes. There is just enough distance between the spokes an the surrounding mounting flange to fit the bolts and still maintain strength/integrity. The bike handles like a dream, goes plenty fast for my needs, and gets almost 100mpg to boot! Feel free to ask any questions on anything i have or have not covered and or missed.