While it's cold everything seems ok,Starts easy and idling fine.Once it get hot,over 75-80C the bike is bogging like it runs out of fuel and dies.It only starts with the choke on but once i open the throttle dies.If it get cold it runs nice again.The carb is cleaned.What else should i check?
could be the crank seals, once the oil gets hot and thin it leaKS thru the r side seal, had an old kx 500 that did the same that was the problem whats the plug colour
I took the head off and noticed that there were no carbon deposits on it.The bike has about 200 miles since the rebuilt and i used seals from the yambits and not the original.I will check tomorrow the gearbox oil.The plug was brown and wet with fuel.
yam bits and most places are supplying the wrong seal for the right hand side u need a proper double sprung lip seal not just a double lip seal
been here 2 times b4 lol with mine i bet thats ur problem mi dtr did exactly same as ur saying changed the rite seal for a proper 1 and it ran mint and still is
Also sounds like what mine was doing, but mine turned out to be a piston semi sieze, it had had a re-bore but they didn't quite take enough out of the barrel, once the piston started to get hot it was expanding, mine was bogging down as if running out of fuel then either stopping completely or just managing to pick up again, if it stopped completly I put it in neutral, and she started up straight away, mile or two down the road it would do same again. Recently had it honed out properly and seems ok now.
I believe that the seal is with double spring.I checked the gearbox oil from the glass and it seems ok,but i will drain it out to measure it for sure.The piston was ok when i took the head off.Hoping that the boring is fine as i have rebored 3 cylinders at the same guy.
