I bored my 83 200x out to 66mm and put a wiseco piston in reseated the valves and did some porting last winter. I went from a 110 main jet to a 128 to a 132 and it ran great until the weather got hot then I was having a bit of hesitation or a sputter in carb going from wide open letting off and getting back on again. Does any one have an idea of the perfect size jet?![]()