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Makotosun

1972 Yamaha ct2 175

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1972 Yamaha ct2 175 was created by Dugadie9

Hi guys,
which piston ring goes on top the green one ?
which one goes on bottom ?

please help Frank 
14 Sep 2023 18:19 #1

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Replied by yam-fan on topic 1972 Yamaha ct2 175

Keystone ring goes on top. Wont fit in the lower groove.
15 Sep 2023 01:30 #2

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Replied by Dugadie9 on topic 1972 Yamaha ct2 175

Keystone is the green one 
15 Sep 2023 04:46 #3

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Replied by Dugadie9 on topic 1972 Yamaha ct2 175

 
15 Sep 2023 05:33 #4

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Replied by Dugadie9 on topic 1972 Yamaha ct2 175

Gray ring 
green ring 
which goes where ?
15 Sep 2023 06:02 #5

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Replied by MarkT on topic 1972 Yamaha ct2 175

A Yamaha Keystone piston normally (always?) has a "K" stamped into it.    You don't want to put a keystone ring into a standard groove piston.

Yamaha rings normally (Exception: Dykes top ring) have a tiny "1" (top) and "2" (second) stamped into the top edge near the ring gap if they are different.  Check for that.  You'll likely need a magnifying glass.  

There are so many mixed up ring sets and piston/ring parts changes over the years, it pays to be careful. 



 
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
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15 Sep 2023 06:03 #6

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Replied by Dugadie9 on topic 1972 Yamaha ct2 175

Thanks you are awesome!!
15 Sep 2023 06:03 #7

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Replied by Dugadie9 on topic 1972 Yamaha ct2 175

Do I use the expander rings ?
how do they go on underneath the main rings ?
15 Sep 2023 06:15 #8

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Replied by MarkT on topic 1972 Yamaha ct2 175

Here's a quote from the (piston and) ring master, Enduronut:

"The CT2 & CT3's models use expander rings underneath both top and bottom rings.

The yellow marked one goes in the top groove.
You'll also notice that it's a bit narrower then the bottom expander."


 
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
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15 Sep 2023 07:46 #9

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Replied by Yamfan on topic 1972 Yamaha ct2 175

Keystone rings wont fit into the wrong piston groove.
15 Sep 2023 09:28 #10

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