My A10 build from a pile of unrelated parts has been on the road for a few months. It has a persistent rocker box oil leak, later alloy head. Rocker boxes have been on an off many times. Two different heads and two rocker boxes.All parts have been checked for fit using machinist straight edge and .001 feeler gauge between the joints. Paper type gaskets, sealer only and .028 thick soft copper gaskets...All leaked from the same areas. Then on the A10 website a few suggested the top mount secured to the rocker hold down bolts can cause fretting between the head and box causing leaks. I leave off the top mount, annealed copper gaskets....No Leaks!!..... But....this is a smooth running engine for a 650 twin.... leaving off the mount has made a noticeable increase in engine vibration.... So...any suggestions on how to fix this problem..?
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