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I had noticed they were the same. I would have thought that if all the dimensions are the same then they will be fine. Are the 125 ones the same weight as the 500 ones ?
Not all the 125 pistons fit as some are higher from the gudgeon pin to dome, As to the T and R there were two manufacturers that Honda used (crazy when Sichoro started out making rings) one was Rikken and the marks go to the top, the different spacer is probably the different makers and no reason the wont both work
Very interesting about the warping. I wonder if that is caused on the outside bores because they get unevenly cooled, the inner bores are essentially surrounded by heat and so I surmise they cool/heat evenly, whereas the outside bores are getting cooled on the outside edges by the fins and so cool unevenly. It matches the warp as well as the front outside where it would get the most cooling is where the most warp occurs.Clever and very observant fellow that Hondaman
What about a single pot then Graham, like say the CB100 or CB125. All areas are cooled but the front 2 would get more cooling, would this result in a double egg shape?
Quote from: Oddjob on August 03, 2016, 02:48:37 PMWhat about a single pot then Graham, like say the CB100 or CB125. All areas are cooled but the front 2 would get more cooling, would this result in a double egg shape?All piston's are oval shape when cold, with the narrowest area in the area of the gudgeon pin as this area is the hottest and expands more during running. You will always get uneven wear with a object that is not round moving that fast and hot in a round bore. All this with outside temperatures cooling it unevenly leads to uneven shaped bores.Kawasaki got it all wrong with the KH 250 as the piston to bore clearance was the same on all three cylinders. This caused the centre pot to over heat and seize due to uneven heat displacement. Give the centre pot a tad more clearance and the problem was resolved.
I always favour the 3 piece over the 1 piece oil ring. Years ago I fitted 4 piece oil rings (Not to Honda's) but, don't see them around any more.