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Everything Dirt Bike
Make / Model Specific
Yamaha
2008 yz250f weird problem need help
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<blockquote data-quote="SRAD97750" data-source="post: 232620" data-attributes="member: 425"><p>Howdy.</p><p>I suspect the bottom end/crank bearings are the problem.</p><p>-The condition and quantitiy of oil has varied wildly while in use.</p><p>-Broken engine parts in the oil.</p><p>-The engine locking up and unlocking.</p><p></p><p>These signs following an oil issue is usually not good.</p><p><strong>Some bearing is giving you trouble and it'll probably be discolored</strong>.</p><p></p><p>I'd take the top end off, and get the crank spinning freely from the clutch and see if it binds at all.</p><p>Does the clutch shaft spin freely?</p><p>Main clutch shaft bearing also would be good to inspect.</p><p>-BIG DAN<img src="https://www.dirtbikeaddicts.com/static/images/smilies/thumb.gif" class="smilie" loading="lazy" alt=":thumb:" title="Thumb :thumb:" data-shortname=":thumb:" /></p></blockquote><p></p>
[QUOTE="SRAD97750, post: 232620, member: 425"] Howdy. I suspect the bottom end/crank bearings are the problem. -The condition and quantitiy of oil has varied wildly while in use. -Broken engine parts in the oil. -The engine locking up and unlocking. These signs following an oil issue is usually not good. [B]Some bearing is giving you trouble and it'll probably be discolored[/B]. I'd take the top end off, and get the crank spinning freely from the clutch and see if it binds at all. Does the clutch shaft spin freely? Main clutch shaft bearing also would be good to inspect. -BIG DAN:thumb: [/QUOTE]
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Everything Dirt Bike
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Yamaha
2008 yz250f weird problem need help
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