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 Topic: Cylinder Repair Help 







kan3

 
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Cylinder Repair Help

kan3 » Wed Apr 23, 2014 12:29 am

Finished taking the cylinder off of my new bike to install a fresh top end and I noticed that the gasket surface of the front cylinder was really bad. It looked like someone peened the surface in a bunch of different places. There were at least 5 different groups of little dimples on the surface. I assumed that it wouldn't seal probably but I put it together anyway. I leak tested it and of course it wasn't sealing so I took it back apart.

I tried lapping it but it wasn't getting anywhere near getting them out so I took the cylinder to someone local that was recommended. He cleaned up the surface and mentioned that he had to go down about .004" to get it all out. During the process though he chipped the nikasil on the top edge of the barrel. Turns out he really only works on older air cooled motors.

I attached some pictures of the chip. My thought process now would be to put it back together and measure the squish then tear it back down to have it re-coated. Anyone see any issue with this and using 2 gaskets to try and get the squish back up to around 1mm? I won't pretend to know a lot about tuning of heads or barrels.

Thanks



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