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drifting piston ring?

1548 Views 14 Replies 9 Participants Last post by  jbranson, 
M
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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if the pin is there in the piston, the ring will usually have a 'bevel' which slips under the pin...it is highly unlikly that the ring would rotate on the piston, really bad things happen when a ring finds a port edge..I have seen it, but in motors with really, really big ports (big single 2-strokes) and really, really worn rings, the rings expand (kind of buldge out) over the port and clip the top edge...very messy, very noisy, very expensive.

d.
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