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At3 piston ring

This is a discussion on At3 piston ring within the Yamaha forums, part of the Manufacturers category; I have a 73, at3 125. My at3 has a piston with 1 ring.But when trying to order rings, suppliers ...


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Old 04-14-2012   #1
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Default At3 piston ring

I have a 73, at3 125. My at3 has a piston with 1 ring.But when trying to order rings, suppliers show an at3 with piston that has 2 rings.
case # AT1 227251.
What do I have?
thanks for any help.
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Old 04-21-2012   #2
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My guess is that you have a wiseco piston. Could be that some of the later YZ pistons had one ring and was substituted. What over size is it? Numbers stamped on top of the piston will tell the oversize.
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Old 04-24-2012   #3
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Hello. There are 2 sets of numbers.
1st. set nearest exaust port is 5 28.
2nd. is 56 50.
Thank you.
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Old 04-24-2012   #4
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Hello I do not know what the first set of numberws are for. However, going by memory, you can verify the 56 number, the 56 indicated 56mm bore which was for the 175c yanmaha. The top ends were interchangeable. Often times the piston had a hole drilled in the side to relieve some of the compression for the electric starter. The .50 indicates that it is on the 2nd oversize.
Hope this helps.
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