plain and simple, why does overjetting increase heat? pipe flow is too slow? or more gas in the mix makes it burn slower? i was jetted at a 80-82 with my 20phbg and mildly ported kstar and biturbo (uni filter) and barely kissed 400 on long uphills, and im geared damn tall (20x40), threw a 86 in there and my temps went up to 410 within a few minutes of riding from a cool engine? and the 78/77 jets i have push the temps down to 350! i thought it was supposed to be the other way around? im timed at 17btdc.