Posted November 15, 200519 yr Hi, i was just hoping someone might have an opinion on how my piston rings should sit on my piston. Bike is a TY250 mono about 84. Last bike i changed a piston on the rings where both the same but on this one they are two different shapes. One is your traditional ring and the other has an L shaped lip. Just to make it trickier their is nothing stamped on either ring, they are genuine yamaha rings and there is nothing in the manual. Just wondering what anybody thought about which ring should go at the top and which way round the ring with the L shaped lip should go? My thanks. J.
December 12, 200519 yr sounds like you have a dykes ring in there the L fits in the top groove of the piston and makes it so the ring forms part of the piston crown for a higher compression the dykes ring has a lower friction contact with the bore as it relies upon gas pressure to force it out
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