Broke the valve on XR125!!

[whitechameleo...]

Hi Guys,

While blowing up the tyres on my XR125, i broke the rear inner tube valve trying to get the inflator off it.

I've ordered a new tube, but am a complete novice when it comes to removing the rear (drum brake) wheel to replace the tube.

Any tips guys?

I am experienced at changing mountain bike tyres, so know how to do it, but not on these size wheels.
I am also an ex car mechanic so am not a complete mechanical fool, just looking for advice.

Thanks.

[Philious]

I had the rear wheel off my xr before it went to the scrap heaven in the sky..

Very easy to work on, and being relatively new they tend to have less corrosion.

You shouldnt have any problems really, just make sure the slot on the drum brake assembly is slotted into position on the stud inside the swingarm before you do your chain adjustment and tighten everything back up.
____________________
Previously; Honda XR125 - Yamaha DT125r - Aprilia Rs125 - Suzuki GS500e, Currently; Kawasaki ZX6R + ZX10R
Theory : Passed 28/7/09 Module 1: Passed 21/09/09 Module 2: Passed 23/09/09

[.]

Whitechameleon,

When you say you have broken the valve, do you mean you have torn the valve from the tube, or just damaged the valve core and it now leaks ?

If it's just the core that's damaged you can unscrew the centre and replace it with a new one

All the best.

[whitechameleo...]

No, it's not the valve core. It's the top of the valve itself, about 1/4 just snapped off and left it leaking air.

It's not like a car or pushbike where the valve will wiggle around in the hole in the rim, it's screwed in tight and as i was trying to remove the petrol station airline in a hurry it just snapped (with surprisingly little pressure)

Cheers.

[.]

Never heard of that before,

Only general advice I can offer is that you mark one side of the tyre in relation to its position on the the rim so it goes back in exactly the same place and maintains the same direction of rotation, then if the wheel had been fitted and balanced correctly originally it won't need doing again afterwards.

[Cigaro]

Not sure about the XR specifically, but it's normally just a case of:

- Undo the brake lever (the bit that makes the brake come on when you push the pedal)
- Undo the nut holding the brake torque arm to the back of the brake assembly.
- Remove the spindle nut and pull the spindle out.

You should then be able to get the wheel free (it can be fiddly sometimes).

As for the inner tube, you will need some tyre levers (2 should do but get 3 just in case).

Unscrew the retaining bolt on the valve stem. Put one tyre lever under the bead of the tyre, prise it outwards and hook it behind one of the spokes. Get another lever and use it to pry the rest of the bead off the rim. Otherwise it's the same as an MTB tyre.

[whitechameleo...]

Thanks for the responses guys.

Got wheel off a piece of pi$$ tonight, then..... tried to remove the tyre!!

Holy $hit!! That mutha isn't coming off there with some tyre levers easily. I'm a pushbike mechanic part time and have changed 100's of tyres and yes, i know these are much bigger, but jesus wasn't expecting that!

Now the wheel's out i'll take it to the bike shop tomorrow!