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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 11-02-2012, 11:44 PM   #1 (permalink)
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Help with a gas tank fitting

I bought a Bultaco 175 tank, because I think it has the right look for my project. The vintage is ~1962. Can anyone give me a hint as to what the petcock thread might be on this tank?
The tank has a male fitting. I measure the major diameter as 0.462", which is very close to 12 mm. The threads are either 24 tpi or 1 mm. With only about five threads on the fitting, I just cannot tell which of the thread gauges matches exactly.
Can anyone tell me what thread this might be? My bargain tank will not be such a bargain if I have to pay to get a new bung welded to it.

Thanks --
-- Jim

Last edited by Magnum_J; 11-03-2012 at 12:34 AM.
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Old 11-03-2012, 04:34 AM   #2 (permalink)
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It's got to be metric.
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Old 11-03-2012, 09:00 AM   #3 (permalink)
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Go on the web and look for Hugh's Bultaco in Crarytown, NY. He owns the Bultaco name now and will have forgotten more about those bikes than anyone else probably knows. Not only can he tell you what size that is, he probably will have a petcock that will fit it.

Hugh Weaver owns the business and is a great guy.

Better than that, I did a quick search and here's the link to his site.

http://www.bultaco.com/

How's that?

regards,
Rob
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Old 11-03-2012, 10:01 AM   #4 (permalink)
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Thanks, Snakeoil. So you're helping me get back up after beating me down on the "removing chrome" thread?

I sent an email to Hugh's Bultaco, and will follow up with a phone call next week.
Thanks!
-- Jim
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Old 11-03-2012, 10:05 PM   #5 (permalink)
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What does not kill you makes you stronger.

Good luck with Hugh. The Motogiro next spring is including his museum for the first day's lunch stop. I've seen it. It's packed with bikes. Hugh own's just about every factory road racer Bultaco ever produced.

regards,
Rob
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