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Makotosun

Leaking petcock question RT2

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Leaking petcock question RT2 was created by Grumman41

I’ve got a leak from my petcock and removed it for inspection. The o ring looks serviceable so I’m thinking it must be the screws. I don’t understand how they could seal with them being inside the wet fuel area and nothing to seal them?
 
08 Apr 2023 06:25 #1

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Replied by nhsteve on topic Leaking petcock question RT2

Are the sealing washers for the screws still intact?
The following user(s) Liked this Post: MarkT
08 Apr 2023 06:36 #2

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Replied by Grumman41 on topic Leaking petcock question RT2

Hhhmmm, there is only metal washers on the screws. 
08 Apr 2023 06:51 #3

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Replied by Gr8uncleal on topic Leaking petcock question RT2

They should be a fibre type material - see link below. I would imagine that they are still available from Yamaha.

WASHER, PLATE(3MB) for RT2 1972 USA - order at CMSNL
08 Apr 2023 07:34 #4

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Replied by MarkT on topic Leaking petcock question RT2

Washers are the same as even a modern YZ85 and Yamaha does have them still.

I've also used the K&L petcock washers that have a rubber seal bonded to it on one side.  They stopped a leak the new Yamaha ones wouldn't.  (I might be wrong, but I thought the original Yamaha petcock washers when these bikes were new had a rubber seal?)

Link to K&L petcock washers on ebay
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 Apr 2023 08:10 #5

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Replied by SKYDANCER46 on topic Leaking petcock question RT2

Just install the correct Yamaha sealing washers and i also use a small amount of permatex no-2 non hardening form-a-gasket sealant on the threads to help seal the screws. let it dry good. Never had one leak. 
1983 XT200, 1983 XT250
08 Apr 2023 09:12 #6

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Replied by Grumman41 on topic Leaking petcock question RT2

Thanks gentlemen! Just wanted some input, didn’t want to be doing this twice.
08 Apr 2023 11:01 #7

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