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Bikes, Hints'n'Tips => FZS600 Fazer => Topic started by: Buzz on 20 August 2018, 12:14:20 pm

Title: Mystery rear flat that magically fixed itself
Post by: Buzz on 20 August 2018, 12:14:20 pm: Morning,

I went to my sisters on Saturday, 30 Motorway miles with no problems. Came out about 5 hours later and the rear was totally flat, I had a repair kit and a pump with me so pumped it back up and threw on some some soapy water...no bubbles at all on the tyre, the bead or the valve. What's stranger is that the tyre then held 38 psi until the next morning when I left. No problems on the way home either....it's a bit of a mystery and has left me wondering if it's going to happen again.

Now I lost the dust cap a few weeks ago and haven't got round to getting another one, the bike had also been standing for a few weeks out on the street and I used the pump to add about 5psi before I left for my sisters. The problem HAS to be with the valve I guess, do you think it could have stayed slightly open when I first pumped the tyre then closed properly when I checked for a leak? I've never seen or heard of this problem before, anyone had the same?

Cheers...Buzz
Title: Re: Mystery rear flat that magically fixed itself
Post by: fazersharp on 20 August 2018, 12:26:49 pm: Quote from: Buzz on 20 August 2018, 12:14:20 pm
do you think it could have stayed slightly open when I first pumped the tyre then closed properly when I checked for a leak?
Cheers...Buzz
sounds like a perfectly plausible idea to me. i can now see why you should always use a dust cap.
Title: Re: Mystery rear flat that magically fixed itself
Post by: Buzz on 20 August 2018, 12:44:32 pm: Indeed, it never occurred to me that a bit of crap could stop the valve from closing...lesson learned.
Title: Re: Mystery rear flat that magically fixed itself
Post by: Jamieg285 on 20 August 2018, 01:23:20 pm: Some kids letting your tyres down?
Title: Re: Mystery rear flat that magically fixed itself
Post by: Bretty on 20 August 2018, 02:55:45 pm: You can get your tyres let down in London, if you park in busy residential areas with limited space for bikes. The locals try and discourage you from parking there. It's baffle me twice before.
Title: Re: Mystery rear flat that magically fixed itself
Post by: mtread on 20 August 2018, 03:07:04 pm: Some bastard with a matchstick...
Title: Re: Mystery rear flat that magically fixed itself
Post by: Trebus on 20 August 2018, 05:13:06 pm: Quote from: fazersharp on 20 August 2018, 12:26:49 pm
Quote from: Buzz on 20 August 2018, 12:14:20 pm
do you think it could have stayed slightly open when I first pumped the tyre then closed properly when I checked for a leak?
Cheers...Buzz
sounds like a perfectly plausible idea to me. i can now see why you should always use a dust cap.

Had exactly the same issue. Took the valve core out and it was slightly corroded. Changed it and all well since.
Title: Re: Mystery rear flat that magically fixed itself
Post by: daviee on 20 August 2018, 06:27:33 pm: deffo crap in the valve