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pokey1

YZ Cam Swap - Won't Start

5 posts in this topic

I put a YZ 450 exhaust cam in my WR 450.

Now the bike won't start.

When I was disassembling, I lined the crank up on the "H" mark, and the cam marks were pretty close to the top of the head. When I went to reassemble, I found the "I" mark, and timed the cams to it, the way the manual shows. The manual also shows 14 chain pins between the upper cam marks, but I have 13 with the YZ cam. :cry:

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I have the YZ cam in my '01 WR426, and it needs 14 pins between the punch marks.

I think your timing is off.

Sorry dude.

:cry:

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Well, I had 14 pins the first time, but the intake cam mark was below the top of the head when the exhaust mark was even. It wouldn't start then either. :cry:

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Hummm....?

Check out this thread. It has pictures of the cams, from both sides. This is how it should look.

Keep working, as the end result is WELL WORTH THE EFFORT!

:cry:

CLICK HERE!

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Tried it again. Didn't look right. Mark on exhaust cam is one tooth below top of head, but 14 pins between top marks.

It started though. :cry:

Thanks for your reply, Brandon. I saw that thread when I did a search a coupla days ago, but I thought maybe the 450 was different.

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