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Author Topic: Petcock options  (Read 1433 times)

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Offline Scott S

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Petcock options
« on: January 21, 2015, 06:54:29 AM »
 I'm building another "Sweep The Floor" bike and I have parts from multiple years, multiple bikes.
 I'm not sure what year the tank is but I believe it's a '75 or '76, which means it most likely has that one-year-only petcock.  ::)

 Maybe someone can tell by the original paint what year it is?



 The carbs I have use a dual fuel inlet. The petcock that came with that tank has a single out. I could use a "T"....done it before....but I was wondering if there was a dual outlet petcock that would fit the tank?
 I'll need a new in-tank filter anyway, and the petcock needs cleaning, to say the least.


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'17 Triumph Street Scrambler
'81 Yamaha XS650

Offline Scott S

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Re: Petcock options
« Reply #1 on: January 21, 2015, 07:06:03 AM »
 And FWIW, the nut on the petcock takes a 22mm wrench. The threads on the bung on the tank have a 19.5mm O.D. The I'D. of the nut on the petcock that threads it on to the tank is ~18.5 mm (kinda hard to get an accurate measurement on that one).
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'71 CB500 K0
'17 Triumph Street Scrambler
'81 Yamaha XS650

Offline rocs

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Re: Petcock options
« Reply #2 on: January 21, 2015, 07:26:17 AM »
Hi Scott,

I purchased a dual petcock off eBay. I believe this was the one.
http://www.ebay.com/itm/HONDA-69-74-CB750-71-73-CB500-74-CB550-PETCOCK-NEW-/361185551022?pt=Motorcycles_Parts_Accessories&hash=item54185622ae&vxp=mtr

Depending on the carbs you have will decide which petcock you will need (I believe. I am an amateur).

I have a spare tank hanging in my shop. I am not sure if it has a petcock or not because its mainly a display piece, The tank is in bad bad shape. If the petcock is dual and functional, Ill send it to you for free in hopes you can use it.

Also, I am almost positive that is a 1976 Candy Garnet Brown tank. I am 99% sure. the 1% lies within some pretty crazy fades I have come across. I have seen Candy Jade Green tanks faded so bad with sunlight and gas that they appear to be Garnet Browns :o
« Last Edit: January 21, 2015, 07:27:56 AM by rocs »
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Offline Scott S

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Re: Petcock options
« Reply #3 on: January 21, 2015, 09:00:15 AM »
 That's the petcock for the earlier style tanks. If you notice, mine has the thread on style petcock.  Oh, we're it so simple that I could use that style!
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Offline Ravie

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Re: Petcock options
« Reply #4 on: January 21, 2015, 10:35:27 AM »
Now you're making me wonder!  I've got a K3 (I think) tank that I traded for and am putting it on my K5.. Now I have to go look and see what kind of outlet it has and what kind of inlet my carbs have...

edit: 2 out of the petcock and 2 inlets to the carbs. Yay!
« Last Edit: January 21, 2015, 10:47:38 AM by Ravie »
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Offline Scott S

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Re: Petcock options
« Reply #5 on: January 22, 2015, 04:11:32 AM »
 Any other ideas? Or a way to identify the thread on the petcock so I can cross shop?
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'81 Yamaha XS650

Offline Garage_guy_chris

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Re: Petcock options
« Reply #6 on: January 22, 2015, 06:23:57 AM »
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Offline 01Thomas

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Re: Petcock options
« Reply #7 on: January 22, 2015, 01:06:58 PM »
A semi decent machinist could fit a second outlet to this existing fuel tap of yours? The casting seems designed for that 2nd outlet.


Quote from: Scott S on January 21, 2015, 06:54:29 AM
I'm building another "Sweep The Floor" bike and I have parts from multiple years, multiple bikes.
 I'm not sure what year the tank is but I believe it's a '75 or '76, which means it most likely has that one-year-only petcock.  ::)
SNIP
 The carbs I have use a dual fuel inlet. The petcock that came with that tank has a single out. I could use a "T"....done it before....but I was wondering if there was a dual outlet petcock that would fit the tank?
 I'll need a new in-tank filter anyway, and the petcock needs cleaning, to say the least.



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1971 Honda CB750 Four K1 [Engine: CB750E-1113521 / Frame: CB750-1113838]
1977 Seeley Honda CB750F (F1) [Engine: CB750E-2551214 / Frame No: SH7-655F]

'96 Yamaha YZF750SP & '81 Moto Guzzi SP1000 & '80 Moto Guzzi 850 LeMans II & '82 Bimota KB-3 [Frame No 49] & '66 Ducati 50 SL/1 & '53 Miele K-50 & '38 Miele 98
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