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Re-ringing my 02 mxz 800 (just for preventative maintenance), and the previous owner didn't tell me that he put in dual ring pistons. Sled has only about 2000 miles on it. Please look at the pictures and tell me if they are Cudney, MCB, etc. Any help is appreciated. I only wanted to order rings, not the whole piston kits if possible. Not sure if you can make it out in the pictures, but stamped on the dome it says "OI" and "STD" and the arrow pointing to the front of the piston. Also, it has caged bearings and the circlip looks like the stock ski-doo circlips
 

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They look exactly like my MCB's, which I have out right now. But, I haven't seen a set of Cudney's yet, so I can't tell you for sure.
 

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my guess also, look like MCB's that I just installed
 
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