Question about 2002 Yamaha YZ 426 F

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Yz 250 2008 possible 5th gear stripped, or shifting fork bent?

1 through 4 is ok.but in 5th bike revs, but nothing to rear wheel seems to slip. New rings, piston, power valve fitted. Bike shop seems to think the 5 th gear is stripped because this is an apparent problem with the YZ. Thanks 2002 YZ426F is good 1 thru 4, when I shift into 5th, it goes in and out of the gear, almost seems like it is running out of gas, or the gear is slipping, if I baby it, it works, as soon as I get on it in 5th only, it starts slipping, could this be the shifting fork?

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Do an oil change. If the gear were stripped there will be lots of metal particles in the oil. More than likely the fork is slightly bent such that the slider for fifth gear is just barely engaging. Put pressure on it by increased throttle and it pops out.

Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock.
www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx

Click on "Transmission"

Posted on Jun 01, 2009

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I doubt that any gears are stripped. Believe me you would have known it when it happened at 40mph which is where you would have to be in 5th gear. This is a bent shift fork. The actual gear is fine. The slider gear is not moving far enough to engage with 5th gear. The YZ does tend to have this problem in 5th and 1st. "Dirt rider Magazine " did a story on it. Best to let the shop do the repair as the entire motor gets torn down into about 100 parts.

Please rate this solution. Thanks!

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