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drifting piston ring?

1546 Views 14 Replies 9 Participants Last post by  jbranson
What can cause a piston ring to drift off the key? A friend of mine has an old kawi 350 triple, and he's running suzuki pistons, with the barrels bored out to match. Not sure what size the pistons are. His bike developed a "ticking" nose last night with only 80 something miles on the new top end. We found the the right piston had drifted off the key. We put it all back together again making sure everything was were it should be. When we kicked it over the nose was gone. But as soon as we started the bike it came back right away. Any thoughts???
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Two stroke pistons have an index pin in each ring land to keep the ring ends properly aligned. Without the pins the rings could rotate, thus allowing a ring end to snag a transfer port as the piston passed by. The index pin and ring end gap are positioned in the cylinder where the end gap's path is solid cylinder wall from top to bottom.

Cheers, Bret @ Glass from the Past

Edited by - bret on Apr 24 2007 10:10:04 PM
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