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mjd400ex
03-04-2011, 08:43 PM
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
03-05-2011, 01:59 AM
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
03-05-2011, 07:04 AM
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
03-05-2011, 04:36 PM
start low

mjd400ex
03-05-2011, 07:08 PM
i ended up with a 2.30 shim on both exhaust valves, is that good or bad?

DnB_racing
03-05-2011, 07:57 PM
as long as your in spec and under 3.00mm you good any more then 3 and resurface and re seat