Honda CBR Shims

[Iceman]

Fair point there nickw. Thanks for the vote of confidence!

[jonnydangerous]

right then, valve clearances can tighten, by the valve regressing/wearing into the seat ( this happens when gears are missed) or they can open up due to wear in components.
the buckets that contain the shims, or cover the shims are ofset from the centre of the camshaft and rotate, although sometimes they get a bit stuck and wear in a funny pattern, causing noise, when the bucket rotates the clearance is not so large and the noise is not apparent.
only way to check is to lift the rocker cover and check clearances.
take the cams out, and check if the tops of the buckets are square. measure the shims and minus this from the clearance. then work out the correct size you will require for the correct clearance.....simple :-)

ive done loads before, if you get stuck gizza shout.

jd.

[Bladepc]

Burger , its not so much the shims wearing , its the valve seats in the head m8 as mentioned above , , hence the valve moves closer to the cam , making the gap tighter ,

also , the shims are not adjustable , if the gap is incorrect , you will need to remove old and order the correct sizes from honda , but keep the old ones you remove,

Finally if you do this check , ensure the engine is cold !!!!

Oh and wind the CCT in , this will enable easier removal of the cams !!

[hotdog]

That all makes sense... thanks for clearing up my confusion