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Makotosun

AT1 piston

  • yamahahaha
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AT1 piston was created by yamahahaha

Bike is AT1E....What do these numbers denote?  I measured the cylinder approx  56.2 mm
Last edit: 19 Apr 2022 14:13 by yamahahaha.
19 Apr 2022 13:30 #1

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Replied by RT325 on topic AT1 piston

Yep she's still std after 50 years. If its at 56.2 its close to first over .25 so might need to go to second in one hit to be sure of cleaning up 56.50. Just my thoughts.
19 Apr 2022 14:43 #2

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Replied by RT325 on topic AT1 piston

Be careful buying a piston kit just incase people advertise them as AT1 & turn out to be AT2 with reed holes.
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19 Apr 2022 14:45 #3

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Replied by Pete-RT1 on topic AT1 piston

If you think it's likely you need a rebore then it's best to take it to the machine shop and get them to check the bore size and confirm whether you need first or second over or if you actually need a rebore in the first place.
Once you have that information you can source what you need and go from there.
How did you measure your bore?
Yamaha CT1 007
Yamaha CT1-B The Greenie
Yamaha CT1-B The Doppelgänger
Yamaha CT1-C
Yamaha AT1-C
2020 Honda CB500X
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19 Apr 2022 15:18 #4

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