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Author Topic: Fuel petcock repairable?  (Read 4822 times)

Offline Noelia

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Fuel petcock repairable?
« on: September 27, 2015, 07:45:06 PM »
Hi all,

My fuel petcock is missing the long tube I don't really know what's the functionality?

Thanks!!


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Offline haynes66

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Re: Fuel petcock repairable?
« Reply #1 on: September 27, 2015, 08:02:19 PM »
the long tube is there to give you a reserve amount of fuel. you can ride without it but you no longer have any reserve.
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Offline Noelia

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Fuel petcock repairable?
« Reply #2 on: September 27, 2015, 08:26:13 PM »
I see! I need a reserve... Can't ride without it Is there anyone in the forum that have a spare one I will be interested!
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Offline AshimotoK0

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Re: Fuel petcock repairable?
« Reply #3 on: September 27, 2015, 09:06:28 PM »
In have some brass tube at work need to check the diameter though.

Ash
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Offline Noelia

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Re: Fuel petcock repairable?
« Reply #4 on: September 27, 2015, 10:03:54 PM »

Quote from: AshimotoK0 on September 27, 2015, 09:06:28 PM
In have some brass tube at work need to check the diameter though.

Ash

Hi Ash, that would be great, do you know the right diameter?

Noe


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Offline AshimotoK0

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Re: Fuel petcock repairable?
« Reply #5 on: September 27, 2015, 10:27:52 PM »
i will try & find out for you.
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Offline AshimotoK0

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Re: Fuel petcock repairable?
« Reply #6 on: September 28, 2015, 07:28:02 AM »
Quote from: AshimotoK0 on September 27, 2015, 10:27:52 PM
i will try & find out for you.

The magic of the USA Site sohc4.net forum  :)  Not sure if he didn't measure diameter  on the wrong bit of the calipers though. Comments please?

I have some 5mm dia brass, I will make you one .. may take a day or so though.

cheers ... Ash

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« Last Edit: September 28, 2015, 07:37:54 AM by AshimotoK0 »
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“Alright friends, you have seen the heavy groups, now you will see morning maniac music. Believe me, yeah. It’s a new dawn.” Grace Slick, Woodstock '69 .. In the year of the Sandcast.

Offline mike the bike

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Re: Fuel petcock repairable?
« Reply #7 on: September 28, 2015, 07:42:26 AM »
Oh dear, not the way to use calipers.
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Offline AshimotoK0

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Re: Fuel petcock repairable?
« Reply #8 on: September 28, 2015, 09:18:23 AM »
Quote from: mike the bike on September 28, 2015, 07:42:26 AM
Oh dear, not the way to use calipers.

Wonder if it's actually 5mm?
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Offline gtmdriver

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Re: Fuel petcock repairable?
« Reply #9 on: September 28, 2015, 10:19:46 AM »
When I stripped my CB350F fuel tap the reserve tube came off in my hand.

It seemed to have a taper fit so I used high strength Loctite and pushed it back in gently with my vice.

So long as the petrol doesn't dissolve the Loctite I'll be fine.
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Offline Menno

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Re: Fuel petcock repairable?
« Reply #10 on: September 28, 2015, 11:11:10 AM »
Ah, Noelia, too bad I just read this post now. Ik have buckets full of these fuelcocks. If I would have known earlier I would simply have put it in the package with the tank.
Well... if you still need one you can have it.
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Offline Noelia

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Re: Fuel petcock repairable?
« Reply #11 on: September 28, 2015, 12:24:14 PM »

Quote from: Menno on September 28, 2015, 11:11:10 AM
Ah, Noelia, too bad I just read this post now. Ik have buckets full of these fuelcocks. If I would have known earlier I would simply have put it in the package with the tank.
Well... if you still need one you can have it.

Hi Menno!

Such a shame!! I didn't know that, I do appreciate that seriously! You're great!

Thanks


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Offline Noelia

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Re: Fuel petcock repairable?
« Reply #12 on: September 28, 2015, 12:26:27 PM »

Quote from: AshimotoK0 on September 28, 2015, 07:28:02 AM
Quote from: AshimotoK0 on September 27, 2015, 10:27:52 PM
i will try & find out for you.

The magic of the USA Site sohc4.net forum  :)  Not sure if he didn't measure diameter  on the wrong bit of the calipers though. Comments please?

I have some 5mm dia brass, I will make you one .. may take a day or so though.

cheers ... Ash

(Attachment Link)

(Attachment Link)

Hi Ash!

No worries For time i still have a week or so to finish the petcock, I appreciate very much your help!

Thanks!


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Offline MCTID

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Re: Fuel petcock repairable?
« Reply #13 on: September 28, 2015, 02:06:03 PM »
Just measured the Petcock on my 1974 CB750K4 US model. I cannot see it being different from the 500/550.

The Outside Diameter (O/D) is 5.5mm.
The wall thickness is 0.6mm.
The tube protrudes into the tank for a distance of 64.6mm (at the longest point - its angled).

Cannot measure how far into the body of the Petcock it is inserted as it's brazed in - but if you allow 25mm you won't go wrong and can cut it off later to give you the 64.6mm length you need when finished.

Measured using my cheapo Digital Caliper.
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Offline Noelia

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Re: Fuel petcock repairable?
« Reply #14 on: September 30, 2015, 11:24:03 AM »

Quote from: MCTID on September 28, 2015, 02:06:03 PM
Just measured the Petcock on my 1974 CB750K4 US model. I cannot see it being different from the 500/550.

The Outside Diameter (O/D) is 5.5mm.
The wall thickness is 0.6mm.
The tube protrudes into the tank for a distance of 64.6mm (at the longest point - its angled).

Cannot measure how far into the body of the Petcock it is inserted as it's brazed in - but if you allow 25mm you won't go wrong and can cut it off later to give you the 64.6mm length you need when finished.

Measured using my cheapo Digital Caliper.

Great info!!!


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