Join Date: Apr 2009
Location: Vancouver, WA, USA
Re: how much $$$
I have a little Yamaha 650 Maxim that is a gas to ride. It is very sensitive to valve clearance and they are supposed to be checked q 6000 miles. It also uses the shim and bucket valve train. There are several members of the XJBIKES forum who have a collection of shims that they loan out in order to verify that the measured and calculated shim is correct before the new shim is ordered. The consensus on the forum is that shims are never re-used. If a shim needs to be replaced then a new one is purchased, This is due to the various wear patterns between the cam lobe and the shim. Each interface is likely to be different even from one valve to another on the same bike. This seems to make sense to me.
The other wisdom is to not use a magnetic instrument to remove a shim from the bucket as you will magnetize the shim which will collect any ferrous bits floating in the oil and place them between the shim and the cam lo9be which is one of the highest pressure points in the engine. This too makes sense even though the factory manual says to use a magnetic tool to remove the shims.
As far as grinding down a shim with a Dremel tool to the appropriate thickness? I would think this would be VERY BAD form. The shims are likely to be surface hardened to match the hardness of the cam lobes. Removing material from the shim would cause it to wear very quickly. Also, there would be no way to get a smooth surface that is consistent across the face of the shim. It would seem imprudent to put a surface that is not perfectly machined against a very expensive cam shaft.
Now then, what is the dealer price for a replacement shim?
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