Question about 2003 Yamaha YZ 250

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Wheel lock rear wheel locked up as if transmission seised . i need advice.

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  • Anonymous Dec 26, 2008

    After I wrecked the bike and bent the handle bars, the clutch doesn't seem to disengage the transmission. With the bike in first gear and the clutch pulled in it will not roll freely. With the engine running, in first gear and clutch pulled in the bike still wants to go forward. I have to use the brake to hold it back.

  • devovedder Dec 30, 2008

    can someone with no knowledge of bottom end rebuild or transmission do this or do i need a mechanic.

  • watts250whip May 17, 2009

    i have a 2008 yz250f that locked up one day and it was the crank i have a friend with a 07 did the same thing and another friend with a 06 did the same

  • Rob Selvy
    Rob Selvy May 11, 2010

    First of all I seriously doubt the transmission is seized unless you ran the bike without oil in the gearbox. I'd really appreciate it if you could give me some more feedback to the questions I asked above.
    The YZ 250 has been around since 1974 and they are a very good bike. I guess it a matter of opinion aas to weather you chose to believe they are "notorious for transmission and clutch problems" I would rank them one of the top two, they other being a Honda for reliability. I have over 30 years experience working on these bikes and tranny issues are not one of their weaknesses. As far as the clutch goes, heck we use the Yamaha clutch in Kawasaki's and other bikes because they are so durable.
    If the transmission is broken like you say, one of the wheel gears will sieze to the shaft, again thins only happens when you don't have adequate oiling. The gears rarely explode unless you downshift from 5th or 6th to first gear WOT.
    Please tell me if the bike will start or if you can kick it over at all. Pay attention when you are trying to kick it over to any particular noises. Is the shifter locked up? Meaning can you shift it up or down either way?
    I'm thinking you may have burned the rod out. This is much more likely than actually losing a transmission gear. If you did lose the rod the bike will be "locked up" like you say.
    When you lose a tranny gear it would most likely be top gear wheel on the mainshaft, if thats the case you will need special tools to split the cases and rebuild the engine.
    You can actually buy the tools from Yamaha much cheaper than paying the labor to have the engine repaired. You can contact me for free advice and all the "how to's" to rebuild the engine.
    If the connecting rod has burned out you will need a rod kit and somebody with crankshaft rebuilding experience to rebuild it. A new crankshaft will cost probably near $320.00 from the dealer. I did some checking and for the gear and the shaft in the transmission you would be spending about $75.00 for both. You will most likely need some additional parts but I can discuss that with you next time we chat.
    Best of Luck,
    Again, just give me some more details and I'll be more than happy to assist you.

  • Rob Selvy
    Rob Selvy May 11, 2010

    1. Can you put the bike in neutral?

    2. Can you shift it at all?

    3. Did throw the chain?

    4. Has the bike been sitting for a long time?

    5. Will the motor run at all?
    If it has been sitting for a while you may just have rust in the rear brake drum causing the wheel to lock.


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  • 28 Answers

Yz250 are notorius for trans and clutch problems if you can put it into nuetral your whee should move if it doesent the trans gear is busted and has the wheel locked up then you can take the transmission out and rebuild it yourself with no problems.

Posted on Dec 28, 2008

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The rear brake seises , release the hose pressure and the bike will be driveable again .

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My rm 80 1stand 2nd gear locks wheels

If your rear wheel is locked up in first and second gear with the engine running, this is not a good sign. Have you ever ran the bike without oil in the transmission? Every time I've seen this, the chain was thrown off the bike and it busted the cases. The oil leaked out of the cases and the transmission locks up. Generally, it locks in fifth gear but it could lock up in any or no gear.

Your problem sounds like something is wrong with the low gear-second gear "clutch gear". The clutch gear is gear that slides sideways on one of the transmission shafts to engage the proper gears. If the bike will roll when in neutral, these may be the only gears affected. If the bike will not roll when in neutral, your problem may be in countershaft. Either way, the transmission could be damaged.

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