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Question on Rocky Piston/Rings 69 DT1

  • pabdt
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Question on Rocky Piston/Rings 69 DT1 was created by pabdt

Ordered rings for a Rocky piston and got what is in the pic.   They are both imprinted T 25. Does anybody know if both rings are the same for the 
DT1 piston? Thank you. 


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1969 Yamaha CT1 175
1969 Yamaha DT1S 250
1974 Yamaha DT125A
1974 Yamaha DT360A with SP96 Exhaust
Next…196x-197x Yamaha something.
Last edit: 07 Aug 2026 21:30 by pabdt.
07 Aug 2026 21:26 #1

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Replied by MarkT on topic Question on Rocky Piston/Rings 69 DT1

Do you have a Rocky piston you are using with those rings?  Or is your piston Yamaha OEM?  What markings are on the piston crown?  
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
08 Aug 2026 14:45 #2

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Replied by pabdt on topic Question on Rocky Piston/Rings 69 DT1

Yes, ROCKY PISTON, new in the box.

One in engine

looks like a Hap Jones piston, but thought I saw a few MC pistons w/same markings.

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════════════════════════════
1969 Yamaha CT1 175
1969 Yamaha DT1S 250
1974 Yamaha DT125A
1974 Yamaha DT360A with SP96 Exhaust
Next…196x-197x Yamaha something.
Last edit: 08 Aug 2026 17:03 by pabdt.
08 Aug 2026 16:16 #3

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