Hey guys my yz250f's exhaust is turning glowing red after i let it idle for 2 mins after i start it wat is wrong? :-/ :-/
if you are refering to motorcross bikes i have a Yamaha Yzf 250 With a Fmf power bomb header and if i rev it once i have let it idle for a while it will glow red. It is normall for them to get extremely hot.
not sure in that bike but on the 450 with a am pipe its supose to glow so far out.....to much glow your to lean
if it just started doing it... is something in your exhaust??? if a mouse gets into the muffler and makes a nest it will jack the back pressure up which will make it run hotter... or did the temp just drop alot recently?? if so its a lean condition
After the yfz450 came out yamaha was telling people the reason the exhaust was turning red was because of the thin wall tubing they used to make their exhaust.
i am talking about an am pipe HMF....its states in the directions that it should glow a few inches out from the exhaust port....any more then that it is lean
man aglowin pipe would worry me... only time i ever seen pipes glow was when a piston let go on my 89 conquest tsi and the turbo manofold and exhaust side of the head were bright orange!!