Carb Problem

Phil.S · Nitrous Nuisance Joined: 04 Feb 2002 Karma :

my M8 has an Nsr125r 2001 uk model, problem is when you wind the throttle on quickly it revs up and then dies, i have tried adjusting float height no difference, tried different settings on the mixture screw still no different and cleaned whole thing a few times now and again no difference.
any suggestions ?
could it be the regulator/rectifier unit or CDI?
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one1895 · Posted: 17:53 - 13 Jan 2004 Post subject:

Have you checked for blockages in the fuel lines?
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Phil.S · Nitrous Nuisance Joined: 04 Feb 2002 Karma :

yep cleaned everything completely.
bloody ball ache it is, its only just started doing it, if you rev it slowly its fine but if you really give it some it goes up and then dies.
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McJamweasel · BCF Junkie Joined: 22 Mar 2002 Karma :

Spark plug?
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Ste · Not Work Safe Joined: 01 Sep 2002 Karma :

Is it warmed up correctly? Any aftermarket parts on it?

Kickstart@Work · Scooby Slapper Joined: 26 Sep 2003 Karma :

Hi

It is probably running lean in the mid range. Check the position of the needle jet, or maybe just drop the clip on it down one notch.

All the best

Keith
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Phil.S · Nitrous Nuisance Joined: 04 Feb 2002 Karma :

how do i do that ?
ie drop the clip any diagrams ?
n e help much appreciated.
new spark spark plug already in - no difference
no aftermarket parts, as such.
full uk bike 2001 model, de-restricted, no other mods.
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Opinions are like assholes,
Everyone has got one.
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Ian (GPX) · Brolly Dolly Joined: 05 Aug 2003 Karma :

Was it running fine when he got it ?

Did he make any adjustments to anything ?

As for the needle jet, you need to undo the top of the carb were the throttle cable goes into the carb and pull it all the way out, this will have a piston connected to it with a needle (long) on the bottom, this needle has groves with a circlip in one of them, move the circlip to another grove, moving the circlip up makes the needle longer, moving the circlip down makes the needle shorter.

If the bike was working fine before, and this needle has not been tampered with, then this is not the fault.

Scooby · Scrappy Doo Joined: 26 Mar 2002 Karma :

I suspect Keith is right. Check your fuel lines for any blockages though, clean out the filter as well in case its that.
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