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Yamaha MX250A 1974 OEM Petcock AD Logo Fuel Cock Assey Valve

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Yamaha MX250A 1974 OEM Petcock AD Logo Fuel Cock Assey Valve was created by Cookymunster

Hi All

Petcock Fuel Cock Assey Valve Confusion
The Yamaha MX250A 1974 Petcock AD Logo Fuel Cock Assey Valve is attached to the bike I bought, as featured in the photos attached. There's no feature of Off / On / Reserve etc. So I ask...
• Is this original?
• Does it have Reserve Fuel function?
• Left is OFF
• What is down? (is it fully on?)
• What is right? (Is it reserve?)

In the photo it is Left/OFF, I assume the long arm lever hanging over is the indicator (Not the sharp point)
Is the long arm lever hanging over, the indicator?
03 Jun 2021 14:36 #1

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Replied by MarkT on topic Yamaha MX250A 1974 OEM Petcock AD Logo Fuel Cock Assey Valve

Looks original to me. 

The pure race models don't have "reserve", just on-off.  Or if you'd prefer, off-on-off.
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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03 Jun 2021 16:12 #2

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Replied by Gr8uncleal on topic Yamaha MX250A 1974 OEM Petcock AD Logo Fuel Cock Assey Valve

AD is an abbreviation for Asahi Denso and they supplied loads of original parts for Yamahas.

I have never raced bikes, but what Mark says makes sense and the single photo of a new part on the CMSNL website shows no sign of having a reserve feed.
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04 Jun 2021 00:22 #3

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Replied by Cookymunster on topic Yamaha MX250A 1974 OEM Petcock AD Logo Fuel Cock Assey Valve

Thank You !!!
04 Jun 2021 03:35 #4

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