Originally Posted by dracothered
Two things I still need to decide on is how many tooth rear sprocket and how to rout the exhaust. So far I haven't been able to find exhaust parts such as the header pipe.
Would say a 48 tooth rear sprocket be a good choice?
There are gear calculators on the web, maybe on the forum. Some of the forum members are really good at this stuff, too. One is gearnut and another is aleman. You might try a pm to those guys.
Don't know about the header other than making one, but no doubt someone on the forum has a lot of know how and experience with pit bike engines... would probably be able to point you toward a source. You might try a specific thread with that question... where to find a header for a pit bike engine to get the attention of the right guys. Good luck!