SOURCE: 2001 yamaha ttr 250, starts, idles ok, bogs at acceleration
Has the bike been stored for any long length of time?
old fuel in the carburetor will turn to a varnish like residue blocking the jets,or possibly water in the carburetor.
Testimonial: "The bike was not stored and was ridden regularly, but it still sounds like it could be the carburetor. Thanks for your insight."
SOURCE: 2001 yamaha ttr 250, starts, idles ok, bogs at acceleration
I have the same bike and same problem. Check the intake hose that connects the carb to the motor it may have a crack mine did and lost power when the bike warmed up. They don't make a replacement hose for it so I am using a rubber plumbers coupling with hose clamps. Might work? The hose is inch and a half diameter and about three inches long try that maybe. Good luck If it makes a chirping sound when the bike gets warm it's probably that hose sucking in air and screwingup your mixture.
SOURCE: Yamaha TW 125 Sputters and hesitates when Hot
well first thing i'd check is the choke isnt sticking on. if so the bikes running rich, hence the temperature.
if its got the paddle switch on the side of the carb, make sure its not turning on once you ride it, if its a cable check its retracting fully by lubing the cable.
and also Fuel treatment e.g. redex isnt a problem fixer, it helps do what it says but it cant beat a thorough strip down.
check your carb jets are clean theres no rust etc inside the float bowl, and make sure your running the right spark plug heat range, as if its too high a range that wont help either.
Testimonial: "ok will get the carb cleaned by a pro. as far as i can see the choke isn't sticking and the throttle retracts OK. will report back. many thanks"
SOURCE: My 1997 Yamaha xt 350 was running good then
Just a thought, check to see if there is any obstruction in the airbox or air filter, and that the air filter is installed properly.
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