SOURCE: Yamaha TTR 250, Idling Problem
you might have an air leak somewhere. chack to make sure you did not loose any o-rings from the diaphragm cap or the pilot screw. also check that there are no cracks on the intake boot. VERY LIGHT sprays of the either or carb cleaner can lead you to the source.
SOURCE: Strange thigs about YAMAHA TW 125
Hi
I have been working on my carb today,the pipe from the bottom of the carb should just run down by the bottom of the swinging arm,there should be another pipe from the pipe on the left side of the carb just above the fuel intake which also runs down to the swinging arm and connect to nothing.
Cheers
SOURCE: Yamaha DT 125 1986 - High Revs when idling
i would say the answer from polar cycle is good...but if it is not the case....you may take a look at crankshaft seal..sometimes the primary compression is not good if cranks seal leaks and it make the bike running lean in gaz and having you're idle getting up sometimes.........check the transmission oil if its low in quantity even after replacing it recently (this means that you're transmission oil is getting burn by you're motor) and also remove the magneto cover to see if there is gaz accumulation in that area...if so that means the seal leaks on the magneto side.....
Testimonial: "After finally rebuilding the carbs and replacing the reeds and air filter, the problem was actually solved by replacing the crank seal. "
SOURCE: 95 Yamaha Wolverine, The engine will not idle down
sounds to me as if your carb is all gunked up pull it off and clean it then see what happens
SOURCE: my 426 doesnt idle smoothly.
Replace Gold idle screw on the carb and then keep turning it clockwise till its revving high, Then slowly do it anti clockwise till its idling at a low RPM which you feel right or/and defined in the owners manual.
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