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Dirt Bike Mods & Maintenance
Bearing Squeal
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[QUOTE="IndyMX, post: 1218203, member: 71057"] My nephews bike (2007 KX85) started making a really nasty squeal when we were riding weekend before last. It's quite loud and sounds like it's coming from the crank on the ignition side. I took the ignition cover off and gave the flywheel a good shake, no noticeable movement. I took the clutch side cover off and inspected everything. I found that the KIPS valve regulator bearings were bad, and replaced them. I thought this might solve the problem, but after I put it all back together tonight and ran it, it still has the noise. I also took the cylinder off and checked the rod & wrist pin bearings, they are fine. No movement up and down that I can feel. I almost lifted the bike off the stand with the rod.. No movement detected. Cylinder and piston looked fine. KIPS valve looked good with the exception of a little bit of carbon buildup. Cleaned it off. I am almost certain that either bearing on the clutch or the crank shaft bearings. It stays the same with the clutch pulled. But, I was under the impression that if the crank bearings started to go, it would have some movement up and down? Am I wrong about that? Should I just go ahead and do a complete bottom end on it and also replace the bearing on the clutch? Has anyone ever had something like this happen? After it started making the noise, he rode 3 or 4 laps before I heard it and made him stop. Oh.. Yeah, the bike still has plenty of power, it seems fine except for that extra loud bearing noise. Almost sounds like a bearing running dry. TIA [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Bearing Squeal
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