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Dirt Bike Brands - Other
2004 YZ450 Cam Seize
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[QUOTE="Rich Rohrich, post: 1163312, member: 16241"] It's unfortunately fairly common for the cam caps to be incorrectly torqued after a valve shim change followed shortly thereafter by a seizure. You need to use an accurate low range torque wrench (usually 1/4 drive) and tighten the caps in stages to limit the chances of this happening. Depending on the extent of the damage I have fixed a lot of YZF heads by cleaning up the bearing surface of the head with a 22mm 320 or 240 grit ball hone and using 320 followed by 600 and finally 1000 grit paper on the cam journal. If it's too far gone Mike at Engine Dynamics does an amazing job of repairing these failures. I've seen him fix heads I was sure were junk. [url]http://enginedynamics.com/[/url] [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
2004 YZ450 Cam Seize
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