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Makotosun

Yamaha CT1 Honda MR175 cylinder image piston swap

  • coxey2
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Yamaha CT1 Honda MR175 cylinder image piston swap was created by coxey2

Here are the MR and CT1 pistons at TDC. What can one expect with the larger opening in the side ports with the CT1 piston?
26 Oct 2019 06:19 #1

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Replied by MarkT on topic Yamaha CT1 Honda MR175 cylinder image piston swap

No problem or effect at all.

The thing that's going to make a difference is intake port is going to open earlier and close later due to the shorter skirt on the CT piston.
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
26 Oct 2019 08:14 #2

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Replied by MarkT on topic Yamaha CT1 Honda MR175 cylinder image piston swap

Also make sure the skirt of the CT1 piston covers the intake port width-wise when the piston is down. It look like it will be close.
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
26 Oct 2019 13:30 #3

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