needle valve thread size

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needle valve thread size

Postby opel » Sat Jan 02, 2010 1:43 pm

QUESTION!! Anyone know the thread size of Super tigre and fox needle valves? I think they are the same.. THANKS!!!!!PHIL
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Postby loucrane » Sat Jan 02, 2010 3:44 pm

Opel,

Which needles are you discussing?

FOX has different needles in various displacement "standard" (CL/FF)engines, and the carb needles have varied over the years with the different types of carbs. All I'm fairly certain of is the Fox Stunt 35 needle being 3-48 USF thread... Duke Fox used some very unusual thread specs for the various adjustment screws and fuel nipples on carbs over the years...

I think SuperTiger uses the same needle spec (pitch and diameter) for the "standard" NVA and in the carbs, or at least used to. It is about a 2.5mm thread - I don't recall the pitch, but it may be a fraction of a mm.

ST NVA are being replaced by similar NVA produced in the USA, for CL Stunt use, at least, by a few people.

Anyone got better info for us?
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needle valve thread size

Postby Ken McClenahan » Mon Jan 04, 2010 8:32 pm

The needle for the old Fox 35 has a 3-48 UNC thread (Lou was right).

The needle for my one and only ST G21 35 measures as a 2-64 UNF thread, but that may not be right. Alright, it measures as 0.0885" diameter, which is a little oversize for a number 2 screw thread. Also, it appears to be a perfect match for my 64 threads per inch thread guage, but it is really hard to tell with such a fine thread.

You might expect that ST used metric threads but the head and backplate screws have 5-40 UNC threads so it looks like they used US Customary inch sizes for the US market.
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ST & Fox 35 needle valve thread size

Postby opel » Tue Jan 05, 2010 8:28 am

Yes THANKS Ken,,
I found i can buy a tap and a die from MSC 2-64 ST AND 3-48 FOX 35
PHIL
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Re: ST & Fox 35 needle valve thread size

Postby Frank Klenk » Thu Jan 21, 2010 7:33 pm

opel wrote:Yes THANKS Ken,,
I found i can buy a tap and a die from MSC 2-64 ST AND 3-48 FOX 35
PHIL


What or who is MSC?
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Who is MSC

Postby opel » Thu Jan 21, 2010 8:55 pm

MSC is Manhaten supply co. It is a national industral supply house. There website is WWW.MSCDIRECT.COM. YES 2-64 IS RIGHT FOR SUPER TIGRE AND FOX 19 C\L NEW STYLE. phil (opel)
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