I'm new here. I'm working on a 01 TTR125 for my son and can't figure out a problem that's been driving me nuts.
Just rebuilt entire top end and cleaned out carb three times so far.
Once warmed up, the bike will go to idle (a little sputtering), then after about 30 seconds the idle starts to gradually increase as time goes on. After a couple minutes it starts really getting high (like 2500 or so). What could it be? There doesn't seem to be any air leaks, I sprayed bike down while running. Could it be the diaphragm on the left side of the carb?
Also, this is my second ttr125 and both are kinda rough on the top end, almost like a valve knock, but I don't think it's that. Is this normal for these bikes?
Help is greatly appreciated, and I did search tons of forums and have only come across one with a slightly similar idle problem, but there were no answers.