04 YZ250 will not shift up into 2nd

SOURCE: Bike shuts down when shifting to 1st.

May be possible that clutch is disengaging when shifting to first and/or drive not fully switched into first gear. Your 1st gear light may be lit, but actually isnt in a ready state.

SOURCE: my banshee wont shift past 2 gear

You have a bent shift fork. The repair means taking the engine out of the frame then removing the top end, removing the flywheel and electrics, removing the clutch , shift mechanism and kick starter and a few other parts. THEN you are ready to split the gearbox to remove the gears and crankshaft and then the shift drum and bent shift fork. Next you get to put it all back together. This is a pretty big job for the home mechanic.

You will need an impact driver, flywheel puller, case splitter and torque wrench plus the normal screwdriver, pliers, etc.. Alternate to the special tools is taking it to the dealer and say "Fix it".
I normally tell people to take it to the shop just so they don't get into such an involved project.

Free service manual PDF download at > http://www.carlsalter.com/motorcycle-manuals.asp

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SOURCE: 2005 yz 250 shifting problems

Well. I'm a motorcycle mechanic and my 2004 RMZ 250 recently did the same thing, The Shift forks inside my transmission actually bent and were not moving the gears as far as they needed to go and eventually got to where it quit shifting all together, recently also repaired a CR 125 That wouldn't shift at all and it was the shaft the shift forks go on was bent and hung the shift forks. Sounds like your shift forks are bent to me though.

SOURCE: MY 2005 FZ6 WONT SHIFT PAST 2ND GEAR AND IS

low the idle speed at1150 r.p.m the gable at 7mm free play and change the oil with a sae 15-50 of IGOL roadster OR IPON 4000 or DENICOL tehno syn

SOURCE: Yamaha Raptor Shifting

Hi there,

Well, it seems like there is a problem with the shift return spring; it's on the backend of the gear, Seems broken or not attached properly, so first of all do this check.

Good Luck!!
Thanks