I am rebuilding a 1996 honda foreman 400 and am putting top end together and installing new pistons and rings. I have oil ring installed and cannot determine difference between top and middle ring, they both have a "T" marking on them. One ring is rectangular in shape (cross section) and the other looks to have a rounded edge on it. Need to know which is top ring?? any help or suggestions would be greatly appreciated..................
I thinking the rectangle shape ring would be your top ring but I am not sure.
Is this a stock piston or aftermarket? I know Wiseco uses a rectangle shape ring in the top grove and the ring for the second grove has a bevel cut on the inside of it.
If one of the rings has a bevel on it, or is "L" shaped, that's proibably your top ring. The bevel goes towards the top. I just check a Rubicon, and it has a beveled top ring.
I thinking the rectangle shape ring would be your top ring but I am not sure. 
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