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I just got a project bike that I've been working on fixing up and I need some advice with. The inside of the tank was very rusty but after some vigorous aquarium rock shaking and a couple coats of redkote that part is taken care of.

Thing is there is no petcock that came with it and I'm kinda new to motorcycle repair so I wanted to ask how to know what kind and what size to get? I can't find alot of info online about it.

It is not the screw in kind its the bolt on kind with two bolt holes on the ends of a oval shaped hole. Are these all the same size or are there different sizes like this?

The bike itself runs great and the bike is actually three bikes, the front is off a 71 shovelhead, the engine and frame is off a 81 yamaha xs1100h, and the rear is off a shaft drive honda. I don't believe this is the original tank because it looks like the guy I bought it from welded some stuff on there for the bolts to go through. He just let the tank sit for too long in his garage in the open humidity and it rusted inside. Any advice is appreciated.
 

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As far as I know there's different sizes, so I think I would measure the distance between the holes, the diameter of the holes themselves and call a company like Pingel or Hylo-Mar.
 

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When i told joe that my petcock was broken of course his dirty mind went you wanna pet my what? They need a better name for this to clean up my dirty mind. I have enough trouble seeing the inside of the gutter...
 

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The term probably comes from some archaic old English usage which has been perverted by our modern dirty minds.

But at least it's more fun to use the term "petcock" then something like, "fuel tank selector valve." Boring.
 

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Any chance you can post a few pics of the tank? Good chance I can ID the tank and then tell you what you need. The term "petcock" originated in England many moons ago. It was a slang term that was used because the Brits call gas "petro", and they referred to many types of valves as "cocks"..."petrocock" got shortened to petcock. Some manuals refer to them as fuel valves or as Eye pointed out, "fuel selector valve". There are many japanese bikes that use what you are describing. A pic of the area where it attaches that also has a ruler along side the holes would also be very helpful.
 

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Glad I'm not the only one that had to do a double take on the title. :D :D
Actually Moni... when it comes to motorcycle mechanic's shop talk, there are lots of terms we use that we don't even think of as "naughty". For instance, when we talk about electrical connectors, we refer to them as mates. One is female, the other is male. I guess cuz I deal with bike repairs 6 days a week I don't think anything about the word petcock. I need to get out more!!! lol
 

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Yep, I know all about the male/female terminology...but when you put 3 (1 has to be separated) of the title words together in the same sentence it tends to "stand out". LOL!!! Anyway, I better stop before this thread has to be moved to the Bar. :D :D
 

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The term "petcock" originated in England many moons ago. It was a slang term that was used because the Brits call gas "petro", and they referred to many types of valves as "cocks"..."petrocock" got shortened to petcock.
That explains it, and thanks for posting. I never made the connection between "petrol" and "pet." Very cool!

And not worth much, but in German a petcock is called a Benzinhahn. Benzin = gas, and Hahn = Rooster, or, "****."
 

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Actually Moni... when it comes to motorcycle mechanic's shop talk, there are lots of terms we use that we don't even think of as "naughty". For instance, when we talk about electrical connectors, we refer to them as mates. One is female, the other is male. I guess cuz I deal with bike repairs 6 days a week I don't think anything about the word petcock. I need to get out more!!! lol
True that.

Once I had a female customer question, and get a little offended, because I had listed a "1/8" NPT NIPPLE" on her invoice after an oil pump repair or some such. I do have a dirty mind, but it never occurred to me that such a trade-specific term would be offensive.
 

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Actually it's those that "claim" to be offended that have the dirty mind.
 

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Discussion Starter #15
Yeah looking at the title I guess I should have caught that, oh well a dirty mind is a terrible thing to waste. :)

Here is a pic of where the petcock goes.
 

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Thanks for the pic Dragoon.... I'll post some answers for ya tonite after work. Based on that pic, you have plenty of choices.
 

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Yep, I know all about the male/female terminology...but when you put 3 (1 has to be separated) of the title words together in the same sentence it tends to "stand out". LOL!!! Anyway, I better stop before this thread has to be moved to the Bar. :D :D
Please continue Moni.... The forum has been slow lately. We need the entertainment!!!! lol :biggrin:
 

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My first thought was that your petcock had to match the size of your pet hen ....

And not worth much, but in German a petcock is called a Benzinhahn. Benzin = gas, and Hahn = Rooster, or, "****."
You know why petrol, or gas, is called Benzine in Germany? Benz's first car ran on the aromatic hydrocarbon benzene, C6H6. So petrol, or gas, is still generically referred to as benzine to this day.

When Mrs Benz took it for a ride one day to see a friend in a nearby town, she set a couple of firsts:

First person to take a car without the owner's permission
First service station - she had to buy benzene at the local pharmacy

I can remember when Shell introduced their Formula 7 petrol in New Zealand around 1960, they promoted that it contained Methyl Benzene! That is the organic compound also known as toluene. They tied their promotion to the release of the film "The Magnificent Seven" starring Yul Brynner, Steve McQueen, Charles Bronson, Robert Vaughn, James Coburn, Brad Dexter, and Horst Buchholz. Quite a marketing coup. These days no-one mentions that petrol, or gas, contains aromatic hydrocarbons because of their association with cancer.
 

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Dragoon.... Sorry for the delay getting back to you. Great pic of the tank!! It helps a lot. Based on the pic, you actually have many petcocks to choose from. Kawi, Yamaha & Suzuki all have used that same layout. But here's where things get complicated. The original 1981 XS1100H had a complicated fuel delivery system. That bike originally had 2 petcocks, 1 on each side, and then a vacuum controlled fuel valve in between the tank and carbs.

First question: Does your bike have an inline electric fuel pump?
2nd question: Does your tank show evidence that it used to have 2 petcocks?

Here's why I ask these 2 questions:
A bike that uses an inline electric fuel pump does not need a vacuum controlled petcock. The fuel pump itself IS the valve.

If your tank was an original XS1100H tank, you'll have a problem if someone welded a plate over one of the petcock mounting areas. That tank can't distribute fuel from 1 side to the other. That's why they used 2 petcocks.


Here's the good news...

You have a multitude of petcocks that will fit that layout. If your bike has an inline electric fuel pump, you'll want to use a petcock from maybe a mid 90's Suzuki Intruder (not the 1400) VS700, VS750, VS800. If your bike has no inline electric fuel pump, then Yamaha is your answer. Any 1992 thru 1998 Yamaha XS750 or 1100 will fit.

Dragoon... That is one helluva Frankenteined bike... would love to see pics of her!! Please keep us updated of her progress, sounds like a really cool project!!
 
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