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Old 06-06-2016, 08:50 PM   #1
willy_the_pirate
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Default replacement panhead petcock

I've got a set of OE pan tanks and I need a petcock, I've searched around and couldn't find anything. So what size petcock do I need? Is the petcock thread the same on all early bikes? And where do I find the cap for the fuel shutoff?
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Old 06-07-2016, 08:30 AM   #2
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Default Re: replacement panhead petcock

I think Colony still sells the whole kit.
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Old 06-07-2016, 08:56 AM   #3
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Do you have the crossover fuel line? I put a pingle petcock on mine, you can get the adaptors for panhead tanks. Then you just block off the original top part with a bolt.
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Old 06-07-2016, 01:22 PM   #4
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Default Re: replacement panhead petcock

So do you have the front petcock with the long rod that goes though the tank or do you have the 3/8 pipe style. I have both styles.
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Old 06-07-2016, 07:31 PM   #5
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Default Re: replacement panhead petcock

I have the style that uses the top mounted fuel shutoff. I'd like to run a standard style petcock. I've seen caps for the fuel shutoff rod but never seem to find out where they came from.
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Old 06-07-2016, 09:19 PM   #6
Larry T
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Default Re: replacement panhead petcock

If you want to run a standard style petcock, why not swap the Pan tanks for a set of tanks that are set up for the standard style petcock?

A little trivia - 1965 was the only year for 5 gallon tanks with early style shutoff.
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Old 06-07-2016, 09:57 PM   #7
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Default Re: replacement panhead petcock

willy,
You might check with VTwin; they used to sell the whole conversion petcock/cross over line assembly for around $55 bucks. It has a hex head cap for the top hole, the bottom cross-over line with fittings, and a petcock with the correct threads to screw in the bottom hole, and seal washers.
I bought a set of old Pan tanks that had that conversion petcock setup. I ran them that way for a while and it worked O.K.

Don't know if you are aware of it, but Carl's Cycle Supply sells a "improved" version of the original thru-rod shut off. Instead of a metal-to-metal seal using a metal rod tip and a metal seat like the o.e.m., Carl is using a PEEK tip on his rods. Should work good.

Geo.
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Old 06-07-2016, 10:10 PM   #8
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Default Re: replacement panhead petcock

Forgot to mention -
the bottom hole for the thru-rod shut off seat is threaded 3/4"-18.
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Old 06-08-2016, 12:00 AM   #9
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Default Re: replacement panhead petcock

Quote:
Originally Posted by Larry T View Post
If you want to run a standard style petcock, why not swap the Pan tanks for a set of tanks that are set up for the standard style petcock?

A little trivia - 1965 was the only year for 5 gallon tanks with early style shutoff.
Because I spent a lot of money to find the proper tanks and have them painted. I've heard nothing but bad reviews on the repop shut offs
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Old 06-08-2016, 12:02 AM   #10
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Default Re: replacement panhead petcock

Quote:
Originally Posted by old.wrench View Post
willy,
You might check with VTwin; they used to sell the whole conversion petcock/cross over line assembly for around $55 bucks. It has a hex head cap for the top hole, the bottom cross-over line with fittings, and a petcock with the correct threads to screw in the bottom hole, and seal washers.
I bought a set of old Pan tanks that had that conversion petcock setup. I ran them that way for a while and it worked O.K.

Don't know if you are aware of it, but Carl's Cycle Supply sells a "improved" version of the original thru-rod shut off. Instead of a metal-to-metal seal using a metal rod tip and a metal seat like the o.e.m., Carl is using a PEEK tip on his rods. Should work good.

Geo.
I checked Vtwin but I'll double check. And I'll look at what ol' Carl has too
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Old 06-08-2016, 12:39 PM   #11
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Default Re: replacement panhead petcock

Carl's do work quite well. The OEM ones i've had luck sweating the threaded portion off the rod itself and lapping it against the seat then sweating it back on. Aligning the rod with the tool helps greatly too.
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Old 06-08-2016, 12:46 PM   #12
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Default Re: replacement panhead petcock

Aligning rod with tool. Ah yes for some reason I have the tool [ never used it welded plug into tank top and faked it.] So if you want to borrow the tool and are reliable enough to sent it back to me ,give the word.
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Old 06-08-2016, 01:24 PM   #13
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Default Re: replacement panhead petcock

You mentioned bad news with repops. I will say I have had a few but the number of bad to good that I have sold hasn't made me quit selling repop parts when the OEM ones are no longer around.
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Old 06-08-2016, 03:40 PM   #14
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Default Re: replacement panhead petcock

willy,
The part number on that conversion petcock setup from VT is 38-0202. I've still got the one that was on the set of 1959-1960 tanks I got from Russ, another JJ forum member. The petcock is a real simple affair that works by pull out to open, push in to close. The in-out stroke is real short - about 3/8".

As far as the repops of the original thru-rod shut off goes, I've seen some pretty crummy ones. Some of them are inconsistent in length, which causes problems with either fully closing or fully opening.
There is a pretty specific spacing between the thru-rod fitting on the tank's top and the face of the seat bung on the tank's bottom. That spacing was set at Factory with special tool that Dave mentions in the post above. The Factory setting can get knocked out of whack easier than you might think; it's pretty easy to knock the bottom seat bung out of alignment when tightening it up with that 1" wrench if ya'all aren't careful to put a nice straight pull on it! That same factory tool not only sets the spacing, it also aligns the top and bottom fittings and squares up their faces so the fuel rod doesn't bind as you rotate it open or closed. So . . . , sometimes problems with the "fuel rod shut off rod" are "fixed" by correcting the spacing distance or alignment.

I'm sure that the reason the PEEK tipped rods work well is because the PEEK is forgiving and slightly compressible, and then it returns back to it's original shape. Magic!

Geo.
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Old 06-08-2016, 08:22 PM   #15
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Default Re: replacement panhead petcock

Quote:
Originally Posted by JAWS View Post
I think Colony still sells the whole kit.
Can confirm, they still sell it...
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Old 06-09-2016, 08:53 PM   #16
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Default Re: replacement panhead petcock

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Originally Posted by PhilipRides View Post
Can confirm, they still sell it...
Do you have the Colony part number?
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Old 06-09-2016, 11:02 PM   #17
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Default Re: replacement panhead petcock

If you are still stuck

Try these guys - FWIW best panhead help I've found in one place

https://www.facebook.com/groups/140053306131150/

Maybe someone like Old Dude has what you need?
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Last edited by panhead_pete; 06-09-2016 at 11:26 PM.
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