Tim Murphy
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To re shim the valves requires the head be removed and reinstalled. That is a lot of work, sometimes has to be done two times to get clearances right Also requires a new head gasket which is a $100 part. Two things surprise me. One, in California, a written estimate is required before the work is done. Two, I have read or was told that you are not suppose to grind shims down as that weakens them. Not sure about that. Also, I think I suggested doing a compression check when you were having problems. That would have indicated some info on valve condition and valve clearances. The valve clearances can be checked at home, requires removing the valve covers and can be checked cold. JH repair manual gives the specs. In any case, the $2,700 seems high to me (all mechanic work seems high to me) but not terribly excessive. I have ZS's but the cost for replacing chokes in carbs seems high as I have read many post here where guys have done it themselves. Hopefully others here will have more experience with this type of thing. Good luck and take care.
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