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pablo83

How to fix a slipped cam

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I was riding the WR426 when it made an odd engine noise and lost power and compression. I had a look and found this:

Cam gear timing is set right:

3477369424_b586d8d881_o.jpg

But the intake cam is off:

3476561983_f34434b1b1_o.jpg

Turns out a lack of oil to the cam bushings caused it to seize and spun the cam gear. I had checked the head recently so it must have taken too long to refill the head with oil. I had reassembled the head with assembly lube, but I did not pour oil directly into the head.

I'm taking this bike to Moab in less than a week so I don't have time to order parts. The head is fine, but upper cam bushings were overheated and the cam would not spin freely in it. I sanded the bushing down by hand with emery cloth until the cam spun smoothly in it. Then I welded the cam gear in place and put a new timing mark on it (two teeth clockwise of the original mark):

3476562171_d40e3aa480_o.jpg

The gear metal is VERY hard. This is what it did to my favorite punch when I made the new mark:

3477369922_7c69776f29_o.jpg

The bike rips again. We'll see if it holds up or if the engine grenades in the middle of the White Rim Trail.

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