cam adjustment

How do I adjust the cams on a 2003 Wr 450 (or YZ 450) ?

There is no E and I like in the 1998 - 2002 models, so am I supposed to use the 0900 and 0300 dots for alignment ?

That's what I am doing, but it's not working (not enough compression).


If the intake has no I or E stampings, then yes, arrange the marks at 9:00, 12:00, and 3:00, and use the 3:00 mark to time the intake. The exhaust has only two marks. Arrange them at 9:00 and 12:00, and use the 9:00.

DO NOT attempt to set a WR450's cam timing to YZ specs, or vice-versa, as you were able to do with the 400/426 because to do so will throw off the timing of the decompression mechanism to the point that the engine won't develop enough compression to start.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now