Honda CG125 removing air valve

[astroscope]

Hi Guys,
I was just going to install this "Dr Sludge" in my tubed tyres but this task seemed easy until i got round to doing it.
The instructions say to "remove the valve core" in order to install/instill this "sludge" stuff. I removed the valve cap and realised that i needed to also remove the air and then valve.
I just didn't know how to do it.
Anyway, installed this sludge stuff and how?
Many thanks
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2010 Honda FES S Wing 125

[tutton]

To get the core out, you need a special core removal tool,
will be loads of on ebay or go ask any shop that does tyres.
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Past: '05 Peugeot XPS '99 Aprillia RS125 '94 FZR600R
Current: '02 ZX636 A1P '51 CCM R30

[astroscope]

Thanks for the prompt reply:
Anyone recommend this sludge stuff? Lot's of people reckon it's a bad idea and can also be dangerous. Causes problems when pumping up a tyre and also dangerous on the road as it casues imbalance whilst riding.
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2010 Honda FES S Wing 125

[Finglonga]

[metal ken]

And when you change a tyre with it in it it can go everywhere, to get the core out the special tool is not expensive, or you could use a fine set of needle nose pliers or circlip pliers sometimes works
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My motorbike breakers metalken.co.uk

Current bikes, GSXR750 Fighter, GSXR7/12, RD350 race rep, KH400