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62125-50 Gas valve / petcock

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44dwarf

Posts: 318

Joined: Mon Feb 06, 2006 1:22 pm

Location: north central Ma.

Post Sun Mar 15, 2009 5:12 pm

62125-50 Gas valve / petcock

Hi Gang.

End of last season my 52K's petcock started messing up it runs out of fuel at 1/2 tank switching to the reserve side and you get nothing out. It will pass compressed air and you can hear it bubble the fuel but you get only a drip then nothing out after that.....
Anyone ever strip one down?
I thought there was a re-pro out there for it but can't find it now.

Weathers warming up and it's time to start working on it.

Thanks for help.

44Dwarf
"Smok'in the competition NOT Tobacco"
"Transplant organs, Don't bury them!"
Why dwarf? 5/8 scale race cars! http://www.dwarfcarracing.com
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Chris Haynes

Posts: 2627

Joined: Wed Jul 05, 2000 12:01 am

Location: Los Angeles, CA

Post Mon Mar 16, 2009 12:52 am

Re: 62125-50 Gas valve / petcock

Try running a pipe cleaner through both on and reserve tubes.
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44dwarf

Posts: 318

Joined: Mon Feb 06, 2006 1:22 pm

Location: north central Ma.

Post Mon Mar 16, 2009 7:02 pm

Re: 62125-50 Gas valve / petcock

Colony does make one.
Colony C9662-1. :D

hold it i just looked it up and that not the petcock thats a filter... Errrr.
"Smok'in the competition NOT Tobacco"
"Transplant organs, Don't bury them!"
Why dwarf? 5/8 scale race cars! http://www.dwarfcarracing.com
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k56

User avatar

Posts: 57

Joined: Tue Apr 22, 2008 9:01 pm

Post Mon Mar 30, 2009 9:24 pm

Re: 62125-50 Gas valve / petcock

dwarf,

there's one on ebay right now...don't know how much it will go for, but here it is:

Harley Shovelhead Ironhead Servi-Car K-Model Petcock / Item number: 190296250674

good luck,
k56
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44dwarf

Posts: 318

Joined: Mon Feb 06, 2006 1:22 pm

Location: north central Ma.

Post Wed Apr 01, 2009 7:03 am

Re: 62125-50 Gas valve / petcock

Thanks for the number I got out bid in the end.

Ted's has a repo but i don't trust T.T. with a gas valve.

I'll clean up what i got and if i can't get the res side to work i'll cut down the primary side some.

44
"Smok'in the competition NOT Tobacco"
"Transplant organs, Don't bury them!"
Why dwarf? 5/8 scale race cars! http://www.dwarfcarracing.com
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FlatHeadSix

Posts: 49

Joined: Tue Mar 03, 2009 9:45 am

Post Wed Apr 01, 2009 9:01 am

Re: 62125-50 Gas valve / petcock

dwarf
The Harley Hummers use the same petcock and, like yours, they eventually all go bad. I have stripped several of them just to see what makes 'em tick. You can tear them apart by filing and messaging the pot-metal casting where it has been crimped to hold the outer face on either side. They have a circular rubber flap peened to the end of the shaft, when you turn the wing it "cams" the shaft outward which pulls the flap away from the inner concentric circle of the valve casting. What makes them go bad is either the flap gets deteriorted or swollen by modern fuel or it comes loose from where it has been peened to the shaft, or both. Putting one back together would require some way of evenly crimping the outer valve body back against the steel face which holds the stem. You can't use any heat or solder because it would melt the rubber flap. Bottom line is that they were not made to be repaired.

There are currently NO good repops available from any source, all the ones you see from the various resellers apparantly came from the same source (Tedd's?) and they are all junk, they either leak or don't pass gas (which in this case is a desirable thing).

I got one of my bikes back on the road by drilling up through the bottom (outfeed) end of the petcock into the central cavity of the valve. This will allow the valve to flow freely and use all the original fuel lines and connections. The downside is that you will not be able to shut the fuel off and you have no reserve, and you have to have a good needle and seat in the carb. But, it will get you down the road if you want to ride the bike. I can post a few pics of the whole mess if anyone is interested.

If anyone learns of new production petcocks which actually work PLEASE let us know!

mike
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44dwarf

Posts: 318

Joined: Mon Feb 06, 2006 1:22 pm

Location: north central Ma.

Post Wed Apr 01, 2009 9:26 am

Re: 62125-50 Gas valve / petcock

Thanks Mike.

I was afraid it was a flap type.
I have a shut off below it anyway as i hate gas stains on the primary cover.. :oops:

It's a rider not a trailer queen so i don't mind the extra cut off. Might even look in to canabiliving the old unit to adapt to a modern unit for now.

44
"Smok'in the competition NOT Tobacco"
"Transplant organs, Don't bury them!"
Why dwarf? 5/8 scale race cars! http://www.dwarfcarracing.com
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suicideshovel65

Posts: 217

Joined: Thu Feb 10, 2005 1:01 am

Location: Palo Alto, CA

Post Wed Apr 01, 2009 9:04 pm

Re: 62125-50 Gas valve / petcock

Some of the petocks I've seen at auction as "K model" petcocks have been kind of weird though, with a threaded part protruding below the petcock? The ones I've seen on the Ks and sporties just have a tube like the one it that auction you referenced. Does anyone know what these threaded versions fit?
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suicideshovel65

Posts: 217

Joined: Thu Feb 10, 2005 1:01 am

Location: Palo Alto, CA

Post Wed Apr 01, 2009 10:06 pm

Re: 62125-50 Gas valve / petcock

44Dwarf - here's another I stumbled across: 170317327989
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RUBONE

Posts: 380

Joined: Fri Nov 30, 2007 7:24 pm

Post Wed Apr 01, 2009 10:21 pm

Re: 62125-50 Gas valve / petcock

Those threaded petcocks are indeed K-model. The early Ks used a steel gas line that threaded on, so did some of the early lightweights.
Robbie
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FlatHeadSix

Posts: 49

Joined: Tue Mar 03, 2009 9:45 am

Post Wed Apr 01, 2009 10:24 pm

Re: 62125-50 Gas valve / petcock

The petcocks with the bottoms threaded for a flared fitting are Harley Hummer petcocks, they used a solid fuel line from the petcock to the fitting on the top of the float bowl of the baby Linkert used on the 165cc lightweights.

I would stear clear of any of those petcocks you find on ePay unless you get an absolute guarantee that they are good. More than likely they are just another one that went bad and somebody is just trying to unload their junk. They probably leak, or won't deliver fuel, or both.

Most of the reputable vendors that were selling the repops have pulled their listings for them and no longer offer them for sale, I would bet that 99% of the ones that were sold were returned for refund.

As I said above, if anyone hears about a decent new production petcock, PLEASE let us all know.

mike
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44dwarf

Posts: 318

Joined: Mon Feb 06, 2006 1:22 pm

Location: north central Ma.

Post Thu Apr 02, 2009 4:59 am

Re: 62125-50 Gas valve / petcock

Yes mine is a threaded type, but like i said i ride it so i don't care what goes on right now.
I'll keep hunting for a good one for when i retire it or sell it.
"Smok'in the competition NOT Tobacco"
"Transplant organs, Don't bury them!"
Why dwarf? 5/8 scale race cars! http://www.dwarfcarracing.com

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