float valves

mansong001 · Borekit Bruiser Joined: 11 Apr 2005 Karma :

does anyone know what float valves are on the nsr 125

THe reoson i ask this is because there is either oil/petrol leaking from one of the overflow pipesnear the side stand.someone told me if its petrol it could be a float valve problem.
can someone please help me on this leakage problem???
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dave madden

tatters · Exxon Valdez Joined: 05 Jan 2004 Karma :

the float is in the bottom of the carb, and its sounds like yours is sticking. undo the nut (which holds the main jet) at the bottom of the float bowl and the bowl should come off and you will see the white plastic float.
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Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV

mansong001 · Borekit Bruiser Joined: 11 Apr 2005 Karma :

thanks for that but i dont even know where the carburetor on the bike is.im not great at things like this.would this cause the spillage of petrol/oil from the pipe.
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dave madden

tatters · Exxon Valdez Joined: 05 Jan 2004 Karma :

yes it would if the float is stuck.

getting at the carb and be found here.

https://www.nsr125.com/derestrict.htm
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Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV

Git · Brolly Dolly Joined: 17 Dec 2003 Karma :

Just made myself some tea before bed and found my camera and a tzr carburettor in the kitchen.

Although the carb isn't an nsr's the layout should be very similar.
Hope it helps somewhat.

mansong001 · Borekit Bruiser Joined: 11 Apr 2005 Karma :

thanks for that.well il give it my best shot.
i have 1 more question.filling up transmission oil
do i need to drain the gear oil first or can i just top it up.i cant seem to see the level on the indicator,can you help please??
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dave madden

Git · Brolly Dolly Joined: 17 Dec 2003 Karma :

I may be inclined to drain all the old stuff and fill with fresh.
You could top it up by all means but if you do not know when it was last changed or what oil it has in there I would go the fresh oil route.

Scotsman37 · World Chat Champion Joined: 17 Aug 2004 Karma :

Here's the service manual for the NSR125 which will show you everything about the bike. Also, if you don't already own a impact driver to begin the untightening of screws and allan bolts then definitely buy one from Halfords for £16 it's must have tool for working on a bike along with a tub of copper grease for screw/bolt threads to prevent future rusting!

Also you will need a spray can of carb cleaner i.e. Motul and a spray can of compressed air called Aero Duster from Maplins to blast the jets and all other holes in/out of the carbs clean after spraying the carb cleaner and remember to press the little push button on the float valve to make sure it moves freely once again.

Also remove the float itself to test it in a glass of water to make sure it actually does float and if it doesn't then you'll need to repair it or better still replace it.

https://www.geneva-racing.com/~alains/NSRmanualDOC.zip

Scotsman37 · World Chat Champion Joined: 17 Aug 2004 Karma :

Hey Git!

That carb is crying out for carb cleaner to be used on it, as it looks like it has a layer of crap/rust on it because it should be gleaming ! Smile

Git · Brolly Dolly Joined: 17 Dec 2003 Karma :

Top eyes that man Smile

The carb has had a float bowl of water for a year or two and was a complete mess when I pulled it to bits, totally full to the top with a salad cream substance. The needles pitted, the needle valves dead, bit of a state really.

Just awaiting a few jets and things to come in from yamaha then the cleaning and putting back together begins.

Then onto tackle the ignition problem, old abused strokers, love it Laughing

Scotsman37 · World Chat Champion Joined: 17 Aug 2004 Karma :

Have you tried carb cleaner like Motul's because it's amazing how crap/rust just disappears in front of your eyes ! Surprised

I did a test on the outside of my carbs for a comparison between WD40 and actual carb cleaner. The WD40 did not dissipate the dried in oil but carb cleaner just simply washed it away instantly!

It's not an RD is it you've got ?

Git · Brolly Dolly Joined: 17 Dec 2003 Karma :

Haven't tried the motul one I don't think but have a box of silkolenes version, pretty good stuff hey Thumbs Up

The carb came off an f plate tzr125.

alains · World Chat Champion Joined: 08 Jul 2004 Karma :

the hight in the float chamber is 24mm +- 1 (nearly 1 inch) here is the picture of your carb
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the worst day fishing is better than the best day working