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Vintage Yamaha Enduro Technical Forums
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Yamaha rt3 idle question
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TOPIC: Yamaha rt3 idle question

Yamaha rt3 idle question 23 Sep 2018 12:24 #11

  • RT360Fan
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OK, that tells me that the oring is old, dried, and/or shrunken. I'd get a new oring on there and try it, you shouldn't have or need a gasket there. Also, check the phenolic spacer for damage, that could cause the oring not to seal.

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Yamaha rt3 idle question 23 Sep 2018 15:01 #12

  • MarkT
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Early bikes had just a gasket... even though there was an o-ring groove.

If it seals good with both, nothing wrong with that IMHO... even though it might be "wrong".

Here's a post from one of the experts on the topic:

yamaha-enduros.com/index.php/forums/part...1-dt1?start=10#47483

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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

Yamaha rt3 idle question 23 Sep 2018 17:58 #13

  • Lamakina
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RT3Fan : you are probably right as the actual (old) O ring has seen better days !! I had ordered an Oring for the carb but the one I received doesn’t fit so I decided to leave the old one... and it leaked air..
I’ll get the right one and fix this at some point :)

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Yamaha rt3 idle question