'84 CR80 Nice!! If nothing else-- I'd try and run as big of sprockets as possible. This is why I'm working with a 150F... It's just alot easier to deal with, and alot less problems. Motor doesn't need much either.
I wish there was a way to run 14/17 inch wheels on it though. I was even half thinking about putting the 150F motor in a 150R chassis, or a DRZ125 chassis. Haha! Prolly won't happen though. I'll just keep it like it is, and when I want to fool around with a smaller bike, I have a stocker 110, and a KX65. Honda needs to put an XR100 motor in a 12/14 inch wheeled chassis as the next generation of pit bikes. --L*64