Am I the only one who tried a 15 so far ???
On the short ovals a 15t front works great . Stay in the first 3 gears is the way to get the best out of a stock motor. 16t works better though. The step up in ratios between 3rd and 4th is a killer. I have a set of fronts from 13t to 18t for "Frank" which will be a 3 speed gearbox. Upto 16t should fit without any mods to the chainsaver.unless you will be riding over 70+mph all day go 13 tooth