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disassemble exhaust cam?

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The exhaust cam on my 03 yz450f walked over because the half moon piece fell out. Now the exhaust cam has quite more resistance than the intake cam when rolled. Is it possible to disassemble the cam and just put a new bearing on it?

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From a practical standpoint, no.  The gear is pressed on, and can be pressed off, but then should not be reused unless it gets tack welded in place.  Plus, there is no key to index the cam in its proper orientation to the gear, so re-establishing the correct timing is a matter for an advanced professional familiar with the process.  By the time all that happens, the price of a replacement isn't that bad.

Normally, it's not the ball bearing that's at fault for the cam seeming to be stiff in the torqued down caps, but the rather tight clearances they set up with.  The spec is 0.0011 - 0.0024".  If you're concerned, check it with PlastiGage.  Scoring in the saddles or caps, or on the shaft itself, needs to be addressed, and if the moved over to the point where a lobe made contact with the end of the cap, it my have created the equivalent of a roll crimp at the end of the bore.

 

 

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