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Old 02-23-2013, 07:32 PM   #74208
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Joined: Jun 2007
Location: Center of the DR650 universe
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Originally Posted by planemanx15 View Post
My theory is that since I didn't do the ring gaps, they expanded with the heat and pressure and scoured the cylinder and piston. This created some free play and the noise that was heard was the piston not seated properly.

Any other opinions would be appreciated.
I'm certain the ring gap is the cause of the problem. I just put the top end on the DR900 Stroker Motor and the top ring had about .006" gap before filing.

Performance rings are normally sized to require filing or grinding to give the desired gap. There are lots of variables that prevent the rings from being sized precisely out of the box. The ring manufacturer relies on the engine builder to adjust the gap for his specific setup.
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