Shim stock is very thin metal sheet. It can be bought in varied thicknesses like .003 or .010. We use brass shim stock when needed. The idea in the Clymer manual is to wrap a piece around the bottom of the exhaust valve so that you can grab it with a pair of pliers and tug. The shim stock prevents damage to the surface and is flexible enough to wrap around the valve. Just keep working at it and be patient. They will come out.
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2000 KX 250 Excel hoops, Pro Circuit exhaust, Factory Connection suspension.
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