There was a problem with some of them Yamaha cylinders, I had a 87 and the dam cover kept comming lose?? I just refilled fluids and put back on and no problems, just keep checking from time to time!
The first few times i used a hamer and punch to get the covr tight, but after awhile i found that my 4 1/2 grinder wrench was the same as the holes in the cover, added some lock tight to the cover and was good to go for a few tears after!
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1986 V20 
Old Fishermen never die, we just SMELL that way!!
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