Question about 2003 Yamaha YZ 250

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2003 yz 250 will not idle rattling noise in 1st gear

The bike seems to run strong when throttled up, but when its in 1st gear and im slowly strolling along theres a rattling noise somewhere down below me. It seemed to happen when i had it opened up, and stopped quikly by using the back break, after that is when it started happening.

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  • akelly000 Jul 31, 2009

    It was slack in chain. Thanks

  • ZXP14X May 11, 2010

    need more info. Can you reproduce this with the bike secured & running on a stand? Check for anything loose, clips, clamps, fasteners, levers. but since you say it wont idle, Check your YPVS (power valves). make sure everything is tight, the little bracket screws are all in, and the side cam's can move free. also go back to basics, check compression. When was the last rebuild? Note: no timing chain on a 2-stroke! :)

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Check if timing chain is not loose. If u found the timing chain is loose check your timing if might jumped one tooth of the gear.

Posted on Jul 26, 2009

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My yz 250 1994 wornt pull in 1st gear it just makes a crunching noise and the chain will vibrate but the bike wornt go but it works in 2nd gear anyone got any solutions for this


Two possible causes, 1. First gear has been stripped and will need replacing, or two the selector is not engaging the gear. Get yourself a manual, I can't help you but you can have a look any way:

http://www.carlsalter.com/motorcycle-manuals.asp ,

After assessing the situation you have to make a decision as to your approach. With a manual, sometimes it is good just to inspect the problem area, but i feel you might need professional help.

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2 Answers

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I am a bit removed from the cost of todays repairs so I suggest you give a call to your local dealer. If I had to guess, I would say about $600.00. Sorry for the bad news.

Top rating for this answer? Thanks!

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1 Answer

Yz 250 2008 possible 5th gear stripped?


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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