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Old 02-23-2013, 08:54 PM   #93
Mr. Canoehead
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Joined: Apr 2007
Location: Calgary, Too far to the mountains and too cold
Oddometer: 1,823
Is the damage on the piston on both faces or only one? I can't tell from your photos. Assuming it is on both faces:

I didn't see this kind of damage occurring unless the ring broke and ended up between the piston and cylinder wall.

So, I did some research and here is what I found (this from

Initially, it looks like this:

But in these cases, damage above the skirt should be minimal. So, I did some more research and found this:

It definitely sounds like no end gap could cause this, although it is not identified specifically in the article. Your piston looks like image #4.

However, those who believe in the Motoman break-in strategy might want to take a good look at this....

If anyone wants a little light reading on this:
2006 FJR1300A, 2005 GS1150 Adventure, 2002 DR650 SE, a fortune in Farkles.

"No matter how many [internet] opinions you line up, you can't vote nonsense into truth"- Kevin Cameron
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