engine trouble

[mjd400ex]

so the 2004 450r i just got has no exhaust valve shims. they had the decompression tighten as far as it would go and their was no clearance. my question is what size shim do i start with to adjust the valves? it also has a crf stage 1 hot cam in it,and i have a shim kit that came with it.

[eastside 400]

just try them out until you get it right, its hard to give a starting point because they are all different depending on seat and valve condition and installation, you can compress the spring enough on the exhaust with a screwdriver so you dont need to take the cam carrier out each time

[DnB_racing]

ya just put something to start then use this formula

A=(B-C)+D

A=New Shim Thickness

B=Recorded Valve Clearance

C=Specified Clearance

D=Old shim Thickness

[desratt]

start low

[mjd400ex]

i ended up with a 2.30 shim on both exhaust valves, is that good or bad?

[DnB_racing]

as long as your in spec and under 3.00mm you good any more then 3 and resurface and re seat