Tyre won’t take air (with inner tube)

[Chrisjlm]

Hello, I have a Yamaha XT 125 the other day I went to take the bike out but the front tyre was flat, not sure why as it was fine 2 days prior. The pin inside the valve seems to be fine but no air is escaping when pressed in (I’m not sure whether this is due to there not being any air to escape though)

I tried a hand pump for well over 5 minutes but didn’t put any air in so I tried a gas station compressed air machine, first I tried regular mode but nothing happened so I tried the “flat tyre” mode and still wasn’t taking any air in.

Apologies if I haven’t explained well enough I’m pretty new to biking and still learning. Thanks in advance.

[NJD]

Surely you're aware that you probably have a puncture on the tube itself and therefore needs replacing?

Worth checking the locknut around the valve stem is tight to the rim (loosen, pull stem by hand and then tighten locknut back up).
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[Ste]

From what you say it sounds like either the valve is faulty and no air is going into the tube or there's a puncture in the tube so air is escaping as fast as it goes in.

If no air was going in the valve then I'd expect the compressor attachment to pop off the valve when you try to inflate the tube.

Either way, I think you need to take the inner tube out to investigate further.

[dynax]

Take the valve out and see if it inflates
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Mike.
Bikes: Xena, Bridget,Florence
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[stinkwheel]

If the valve was jammed, the pump would offer a lot of resistance. If air is going out of the pump but the tyre isn't inflating, you have a puncture.

If you're getting nothing at all even with a compressor, I'd guess the valve has torn off the tube. This is a common issue if you run on an underinflated/flat tyre and the tyre itself slips round on the rim.

If this is what happened and you are running low tyre pressures for offroad grip, consider fitting a rimlock. Or if you aren't using it on the road at all, a mousse.

I run my trials bike at 6psi and the tyre can still slip, even with a rimlock. I never screw the little nut down against the rim for this reason. I put the valve cap on and screw the nut up against it, then if the tyre moves slightly, I'll notice the valve sitting at an odd angle.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Chrisjlm]

So I got the inner tube out and it had completely torn away from the valve. I guess it’s just a case of fitting a new tube then. Any advice on stopping it happening again?

https://ibb.co/wzXgcwG
https://ibb.co/1Tb0fsP

[yen_powell]

Old tubes perish so replacing them every tyre can be a good idea.

In addition if you let the tyre run soft or flat it can creep around the wheel rim pulling the valve. If you see a valve not sitting at 90 degrees to the rim then this is what is happening. On trail bikes some people leave the external locking ring or nut off completely or loosened so they can see if this is happening when they run lower pressures for mud or sand.
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Blackmail is a nasty word........but not as nasty as phlegm!
XT1200Z and a DR350 in bits

[Riejufixing]

Security bolts?

[stinkwheel]

In addition to my previous about running soft tyres etc, you also need to ensure the tyre is properly seated onthe rim when you fit it. There is a thin line on the outside of the tyre sidewall all the way around. You need to make sure you can see this an equal distance from the rim all the way round on both sides.

It can take a lot of pressure to achieve this. I had to put 90psi into the roadrider front tyre on my Enfield with the valve core out to get it fully seated. Once seated, I let the air out again, re-fitted the valve core and inflated it to the correct pressure.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Riejufixing]

[quote="stinkwheel"I had to put 90psi into the roadrider front tyre on my Enfield with the valve core out to get it fully seated.[/quote]
That's dangerous. You should use tyre paste.

[stinkwheel]

[Jozzer]

Replace the tube, they're cheap and inexpensive so far easier (and far cheaper) than getting the old one repaired...

Could be one of two or three issues, perished tube (old age) tube has rubbed through inside somewhere (usually caused by under inflation) or proper punctured nail/thorn etc...

[blurredman]

Some tyres indeed can be pigs to re-install, esspecially if they're more inclined for tubeless applications.
____________________
CBT: 12/06/10, Theory: 22/09/10, Module 1: 09/11/10, Module 2: 19/01/11
Past: 1991 Honda CG125BR-J, 1992 (1980) Honda XL125S, 1996 Kawasaki GPZ500S, 1979 MZ TS150.
Current: 1973 MZ ES250/2 - 18k, 1979 Suzuki TS185ER - 10k, 1981 Honda CX500B - 91k, 1987 MZ ETZ250 (295cc) - 40k, 1989 MZ ETZ251 - 51k.

[redeem ouzzer]

I think the Michelin Pilot Sporty on the back of my X5 took 80 PSI to seat. Some beads are just bastards to pop.
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Be a REAL MAN!

[steve the grease]

[Jozzer]

[Polarbear]

[Ste]

[Johnnythefox]

Just had my Harley Sportster MOT and asked them to check front tyre as not holding pressure overnight, new valve fitted (for free) bike passed all done £29.65 - i gave them some money for the workshop tea bag supply.

[Jozzer]

[oilyrag]

PSI means Pounds divided by Square Inches. Pressure = Force/Area

Volume only depends on the dimensions. Cubic Inches.

[Evil Hans]

[Polarbear]

[Riejufixing]