Valve shim help

[guccimanescarwash]

I started to shim my valves on my yz and when I tighten down the end bolts to exhaust cam does not want to spin

[DC_Excitement]

Either the valve bucket to cam lobe clearance it too tight, or there is an issue with the cam or the bore where the cam rides on

[grayracer513]

Be sure that the cam caps are seated by hand all the way down; never pull them down with the bolts.  Be certain to tighten them in 3 or so steps, in the sequence shown in the manual, and not one tick tighter than spec.  In fact, tighten them to 75 inch pounds instead of 86.

 

Check clearances with plasti-gage as shown in the manual.  Not too unusual for the intake cam to feel a bit tight in a cold head.

[guccimanescarwash]

It was a burr that was holding it . I sanded it and it is fine