YAMAHA DT LC TRAILS BIKE REV PROBLEMS CAN ANYBOD HELP

[jasonDT]

hi to you all
can anybody help me ive just bought myself a YAMAHA DT LC year 1986 in great condition for the year but ive got a problem with the engine i can get the rev counter to stay at 1500rpm but when i rev the engine it revs ok but wont return back to 1500rpm it stays at 3000rpm until i turn the screw on the carb then the revs go down again ive got to do this everytime i rev the bike ive been told it could be the carb as ive been told its to big for the engine its for a 250cc yamaha but im not sure the car is a mic the engine starts well but this problem is bugging me can anybody please help me cheers jay
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hi to all and thanks for your help

[yen_powell]

When I've seen this behaviour before it's been because the rubber manifold between the carb and engine was perished or not sealing properly, leading to the engine revving sometimes on it's own as extra air gets drawn in.

If it's perished you can check by spraying WD40 onto and around the rubber when the engines running and seeing if the revs rise as it's drawn in.
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Blackmail is a nasty word........but not as nasty as phlegm!
XT1200Z and a DR350 in bits

[fiery tupp]

It could be just the cable needing oiling , or renewing ?
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If you can't fix it with a hammer , use your head .

[jasonDT]

[jasonDT]

[HD]

Maybe something is sticking inside the carb? And when you turn the screw it jumps back down? Throttle slide or needle?

Strip down your carb, clean it up and put it back in. Failing that buy a new carb for the correct engine
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Rusty '02 Vito Camper + CBR600F3

[jasonDT]

[jasonDT]