I posted a manual under your other thread. You can just let those die off, and post it all here. The forum search will still locate them for others w/ ?'s. Even if you buy another var. you will still need to tune it. I think it would be easier to get 2 sets of rollers, swap them out, test run, repeat. That way you get a feel for the set up. and can later add the Hi $ parts. Chances are good that if you swap your pipe, w/out rejetting the rollers won't matter anyway. You allready got all the power the scoot was built with. Anything more takes a good ear for the engine, and alot of trial, and error. You could even buy 3-4 sets of cheapo Ebay rollers for the price of 2 good sets, and try them all. Just buy a good set of the weight you like, and swap them 1 more time.