Author Topic: Brass nipple pulled out of petcock - repairable or new petcock?  (Read 368 times)

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Offline TinDog

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Brass nipple pulled out of petcock - repairable or new petcock?
« on: September 08, 2017, 06:33:11 pm »
Valve adjust time and I've been pulling everything off to get there.  When i removed the tank, I didn't notice anything amiss, but when I started tucking fuel and vacuum lines out of the way to get to work, I saw my fuel line had a brass fitting hanging out that could only have come from one place. 

Is it repairable?  It's the original vacuum petcock on a 2006 model.  Is it time to replace it regardless just due to age.  The Murph's stock replacement runs about $80.  Is that the preferred way to go or is a manual superior?  Sorry - lots of questions.

Offline works4me

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Re: Brass nipple pulled out of petcock - repairable or new petcock?
« Reply #1 on: September 08, 2017, 06:39:24 pm »
By the time you get done repairing it,
and subsequently rebuilding it since you
have it out and disassembled anyway,
you would be ahead by just replacing it.
If only for peace of mind. JMHO

Offline Rev Ryder

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Re: Brass nipple pulled out of petcock - repairable or new petcock?
« Reply #2 on: September 08, 2017, 06:39:53 pm »
John Dawg, I just got one word fer it.

FARHAZURD

I reckon it could be epoxied or such, but I'm thinking it's gonna leak or worse, fall out when the engine's running and for those few seconds afterward there will be a nice rush of fuel onto the engine and yer leg.  Not the stuff sweet dreams are made of.  Maybe a new or gently used one is in the cards fer ya.  I like the new ones in two days (2 days to Texas, might be faster everywhere else) from Murphskits.com
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Offline Bud

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Re: Brass nipple pulled out of petcock - repairable or new petcock?
« Reply #3 on: September 08, 2017, 07:29:09 pm »
John Dawg, I just got one word fer it.

FARHAZURD

I reckon it could be epoxied or such, but I'm thinking it's gonna leak or worse, fall out when the engine's running and for those few seconds afterward there will be a nice rush of fuel onto the engine and yer leg.  Not the stuff sweet dreams are made of.  Maybe a new or gently used one is in the cards fer ya.  I like the new ones in two days (2 days to Texas, might be faster everywhere else) from Murphskits.com

What Rev said!  Just buy the new one and be done with it.  Not only is it a potential  FARHARZARD (Love that Rev  :rotflmao:), a new petcock will help prevent a future hydrolock event.  No hydrolock means not having to decide whether to buy another engine and swap it out or junk your bike.

Offline MAN OF BLUES

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Re: Brass nipple pulled out of petcock - repairable or new petcock?
« Reply #4 on: September 08, 2017, 07:50:47 pm »
If you buy a new one, please send me your old one, and the nipple.... id be glad to have it, and would pay the mail fee...
Just blow it off well, and set it out in the sun for a day, before double bagging it in ziploc bags when sending it...

I say this because every japanese bike I have owned since 1974 has at one time or another, popped that brass fitting out...
It sits in a tapered hole, and usually there is room at the bottom for it to be pressed further in... I have just inserted them back into place, with no adhesives, and tapped them lightly with hammer while supporting the valve on a hard surface, and reinstalled them, and have tyhem work forever after that without incident.
If this sounds worrysome, and some folks may or may not think I'm nuts, you can also VERY GENTLY re flare that end by using a pin punch or a nail set punch that fits thru the tube.
The tapered surface where the pin punch meets the shank is perfect for this, and with the tube supported a single tap on the hammer will swell that end that inserts back enough to make a tight press fit again...   use caution, don't bash on it, just a tap will reflare it perfectly... once pressed back in, its the same as it came from the factory... seriously.

Something like this will flare it back to size...
« Last Edit: September 08, 2017, 07:56:08 pm by MAN OF BLUES »

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Offline DC Concours

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Re: Brass nipple pulled out of petcock - repairable or new petcock?
« Reply #5 on: September 08, 2017, 08:17:48 pm »
This happened to me and I just shoved it back in with hand. It's pressed in there and held by friction.

I didn't even tap it back in. But I recommend you tap it in there gently and see what happens.

Offline dboogie2288

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Re: Brass nipple pulled out of petcock - repairable or new petcock?
« Reply #6 on: September 08, 2017, 08:21:41 pm »
As for the manual versus factory petcock...if you have SISF carb job, with the overflow tubes, get the factory.

I had it done on the 02, and have the factory petcock, and Ooooo the convenience. I never knew how much a pita messing with the manual petcock is, because my 06 has one - but no carb job yet.
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Offline m in sc

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Re: Brass nipple pulled out of petcock - repairable or new petcock?
« Reply #7 on: September 08, 2017, 11:38:48 pm »
this happens, especially on really old bikes. use sleeving loctite on it (the green stuff) and press back in. it will never come out again. just reference for all brass fittings. 

Offline cra-z1000

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Re: Brass nipple pulled out of petcock - repairable or new petcock?
« Reply #8 on: September 08, 2017, 11:45:28 pm »
You should change that old one out anyway.  They go bad eventually .
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Offline MAN OF BLUES

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Re: Brass nipple pulled out of petcock - repairable or new petcock?
« Reply #9 on: September 08, 2017, 11:47:10 pm »
I've never, ever, put any credence in any adhesive, to repair this.. it wasn't done when manufactured, and is a possible failure point and false indicator that the press fit itself, is what seals.. if it leaks when flared and press fit back in, buy a new one..

That said, I have two of the many bikes I owned, that I repaired as noted, and neither has me foncerned as far as a leaker.. over a period of between 39 years and 12 years on respective repairs..

Jmho.

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Offline m in sc

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Re: Brass nipple pulled out of petcock - repairable or new petcock?
« Reply #10 on: September 09, 2017, 12:57:48 am »
ok....thats cool, do it your way, i'm sure it works fine. However, green sleeving loctite has never failed me yet. we used it to secure the main spindle drive on my okuma mc-4va mill.. per factory spec. seems to be doing just fine.  :-X  sleeving loctite is a completely different animal as 'adhesive'. ive use this on petcocks that are 50 years old. you can poo poo the idea all you want, i didn't bash your spreading the brass, don't crap on my method please, especially if you haven't tried it. the sleeving loctite bonds across the whole surface, not just a single flare point. permatex makes this stuff for a reason, and 30 yrs experience tells me it works quite well. look up the properties of loctite 640, and try it.

Offline connie_rider

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Re: Brass nipple pulled out of petcock - repairable or new petcock?
« Reply #11 on: September 09, 2017, 01:03:10 am »
I've had the brass nipple pull out on several bikes over the years.
Just shoved em' back in and tapped em' with a little bitty Harley Davidson fine tuning tool. (err hammer)

Ride safe, Ted
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Offline connieklr

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Re: Brass nipple pulled out of petcock - repairable or new petcock?
« Reply #12 on: September 09, 2017, 10:29:39 am »
I've had the brass nipple pull out on several bikes over the years.
Just shoved em' back in and tapped em' with a little bitty Harley Davidson fine tuning tool. (err hammer)

Ride safe, Ted

Ditto that...... numerous times.
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Offline ErikB_76

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Re: Brass nipple pulled out of petcock - repairable or new petcock?
« Reply #13 on: September 09, 2017, 12:19:04 pm »
If you do repair it, be sure to PRESS it in. Do not twist it. 
Twisting will enlarge the hole in the valve and you'll end up with a loose fit.

Ususally, you're more tempted to twist something like this to remove it, but the same applies for installation.

You can definitely repair this.
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Offline LeeM

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Re: Brass nipple pulled out of petcock - repairable or new petcock?
« Reply #14 on: September 15, 2017, 12:05:52 pm »
Domestic and Asian fuel line tubing fits onto the petcock differently.

My bike seems to have the original fuel line hose and it is a reasonable push fit into the petcock. 

A long time ago I stopped using automobile parts store fuel hose because inch-dimension tubing doesn't fit the same as Asian fuel line.