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Makotosun

Piston size

  • yamahahaha
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Piston size was created by yamahahaha

Seller states piston is from a 1969 AT1........What size is this piston in picture??? 
Last edit: 29 Jun 2022 08:47 by yamahahaha.
29 Jun 2022 08:43 #1

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Replied by MarkT on topic Piston size

Impossible to tell.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
29 Jun 2022 09:33 #2

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Replied by MarkT on topic Piston size

To clarify, it sounds like you want to confirm it's for a  69 125?  Can't tell from just that picture.

If you're certain it's a 69 125 piston...  remembering that a swap to 175 top end was common even back when these bikes were new...  then it's a standard size.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
29 Jun 2022 09:37 #3

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Replied by Swoop56 on topic Piston size

It might pay to verify if the piston is for piston port or reed valve engine .
 
29 Jun 2022 14:19 #4

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Replied by RT325 on topic Piston size

If it's 56mm its a 125. If its has 'No Holes' [windows] its an AT1. Markings on top mean Std size. K means keystone taper top ring [or is it both rings]. Piston doesn't look to be stepped at the top for a Dykes L shape top ring so yep it's an early piston. But as said--squeeze seller for a bit more info or pics from all sides.
29 Jun 2022 16:11 #5

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