Had same problem with my sons 2000 1100. Was told by mechanic that the High RPM Jet was clogged and to clean carb. I filled the tank, put 1/3 of a can of Seafoam carb/injector cleaner, by the end of the week it was running 100 mph again.
SOURCE: wont go into 1st or 2nd, but will shift up to 4th
Take it back to the shop/mate that rebuilt it and get them to fix it.Or if you did it make sure the shifter drum is in the correct position and the selector lever is functioning correctly.Failing that you'll have to go back inside and check correct installation of selector forks.Make sure the tranny is functioning correctly BEFORE you put the other half of the engine casing together by spinning the outputshaft and going through ALL the gears turning the drum. Hpoe it all works out good for ya ....
SOURCE: 2nd gear does not work on my Yamaha Virago xv250
Sounds like a slightly bent shift fork. The slider gear isn't quite engaging into 2nd. If the bend gets worse then you won't get into first and the pedal will get real stiff in those gears. The repair is best done in the shop.
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SOURCE: 2006 R6 Shifting Problem
Howdy: The 3rd and 4th gears are used the most, after awhile the dog and shifting forks get worn more. Try changing to Yamaha Lube simi-syn oil 10/40. Drain oil after warm up (get trans oil warm). The oil is in a silver 4gal containe at the Yamaha dealer. This oil has helped me.
Good luck - Doug
SOURCE: hi i have a 98 yz 250 goes brillant 3rd gear problems
possible bent or worn shift fork 3rd gear
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