Schrader Valve Question


Information and questions on GL1100 Goldwings (1980-1983)
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mytown
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Schrader Valve Question

Post by mytown » Tue Nov 28, 2017 4:04 am



My front tire takes forever to go flat but flat it does go, in about 4-6 weeks time if not a bit longer. I find no sign of puncture so I'm guessing schrader valve. Is there any great mystery about changing the valve core or is it just take out the old one and screw in the new? Any other ideas as to what could cause a slow, slow leak?



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RBGERSON
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Re: Schrader Valve Question

Post by RBGERSON » Tue Nov 28, 2017 8:04 am

Bad seat of tire, nail/screw/metal in the tire..as to changing the schrader nope that's it unscrew and screw in new one. puncture can be hard to find.
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

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mytown
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Re: Schrader Valve Question

Post by mytown » Tue Nov 28, 2017 4:52 pm

RBGERSON wrote:
Tue Nov 28, 2017 8:04 am
Bad seat of tire, nail/screw/metal in the tire..as to changing the schrader nope that's it unscrew and screw in new one. puncture can be hard to find.
I see what you mean about finding a puncture, that it can be hard to find. Lots of small crevasses in a tire for a tiny bit to hide. I changed the valve core and will monitor it regularly. Any sign of a problem the tire comes off for an in depth inspection.

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Re: Schrader Valve Question

Post by WingAdmin » Wed Nov 29, 2017 7:03 pm

Pump it up all the way, then take a spray bottle, put a squirt of dish soap in it, and spray it around the tire and the valve. You will likely find bubbles appearing wherever the leak is.

I have the same thing on my front tire, and it is the bead seat. I'll be sealing my rim this winter when I put new tires on.

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mytown
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Re: Schrader Valve Question

Post by mytown » Thu Dec 07, 2017 6:29 pm

WingAdmin wrote:
Wed Nov 29, 2017 7:03 pm
Pump it up all the way, then take a spray bottle, put a squirt of dish soap in it, and spray it around the tire and the valve. You will likely find bubbles appearing wherever the leak is.

I have the same thing on my front tire, and it is the bead seat. I'll be sealing my rim this winter when I put new tires on.
Thanks for the tip WingAdmin. I sprayed around the tire and rim several times and was unable to locate the leak which is still present after changing the valve core.
Will be removing the tire for further inspection. I'm wondering what you mean when you say you will be sealing the rim.

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AZgl1800
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Re: Schrader Valve Question

Post by AZgl1800 » Thu Dec 07, 2017 7:09 pm

Take the wheel off the bike.

get one of those big plastic tubs from the dollar store, 48 qt size or bigger.

fill it with water and lower the wheel down to just below the bearings.

watch it for a while, if there is a leak, you will see some small bubbles.
add some Dawn dish washing soap to the water, makes those bubbles really show up good.
John
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Re: Schrader Valve Question

Post by WingAdmin » Thu Dec 07, 2017 9:26 pm

mytown wrote:
Thu Dec 07, 2017 6:29 pm
WingAdmin wrote:
Wed Nov 29, 2017 7:03 pm
Pump it up all the way, then take a spray bottle, put a squirt of dish soap in it, and spray it around the tire and the valve. You will likely find bubbles appearing wherever the leak is.

I have the same thing on my front tire, and it is the bead seat. I'll be sealing my rim this winter when I put new tires on.
Thanks for the tip WingAdmin. I sprayed around the tire and rim several times and was unable to locate the leak which is still present after changing the valve core.
Will be removing the tire for further inspection. I'm wondering what you mean when you say you will be sealing the rim.
A bead sealer is a sealant you paint on the rim (after cleaning it) that levels out scratches and imperfections, and presents a good, sealable surface to the bead on the tire, to prevent the slow leaks:

https://www.amazon.com/Slime-10137-Bead ... UTF8&psc=1

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mytown
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Re: Schrader Valve Question

Post by mytown » Wed Dec 13, 2017 1:41 am

AZgl1800 wrote:
Thu Dec 07, 2017 7:09 pm
Take the wheel off the bike.

get one of those big plastic tubs from the dollar store, 48 qt size or bigger.

fill it with water and lower the wheel down to just below the bearings.

watch it for a while, if there is a leak, you will see some small bubbles.
add some Dawn dish washing soap to the water, makes those bubbles really show up good.
Got it. You can see a line of small bubbles around the bottom of the rim:


There were several such spots. The bubbles were small and slow to rise. I brushed them away a number of times and they came back.
After the last time it went flat, I rode on the tire about 1/2 mile to an air pump. The tire inflated and the bead set, but I don't know if I damaged the tire or rim.

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Re: Schrader Valve Question

Post by WingAdmin » Wed Dec 13, 2017 8:46 am

Well it's one of two things then: a damaged bead on the tire (and yes, could be damaged by riding on when flat), or corrosion on the rim. Rim damage from riding on a flat tire would be plainly evident - scuffs, denting and/or cracks in the rim itself.

Either way, the tire is going to have to come off to fix. If there's corrosion you will have to remove the corrosion and seal the rim up before the bead will seal properly.



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