Question about 2001 KTM Exc-Racing E 520

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Fuel leaking from carburettor - 2001 KTM Exc-Racing E 520

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The most common issue with leaking fuel is the needle being stuck open. Usually this is from dirt or other foreign material getting into the fuel system.
Also, if your bike has been sitting for awhile, gas will gum up and clog the needle jet.
Your best bet is to remove and clean the carb.
Check to be sure fuel has not run into the crankcase and diluted your oil. If it has, change oil immediately. A good way to check is to open the oil fill plug and smell the opening.

Posted on Mar 11, 2009

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Posted on Jan 02, 2017

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Liberty 50 2t fuel leak when starting. a heavy fuel leak down over the flywheel and onto exhaust when standing or more extreme when starting.

Fuel float in carburettor maybe set to high! causing Needle and seat not to close! hence letting fuel flow from Over flow pipe in carburettor.

Turn fuel on then off to start engine once engine running turn fuel on again.

But best to adjust fuel float height, its just a tiny bend you have to make on a brass tab to stop fuel flow when the float gets to a certain height! in the fuel bowl of the carburetor.



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I have a 1980 Suzuki gs250t the oil smells like gas but not bad and when I start it and then shut it off and check the oil it always has a little bit more.

sounds like you have got worn piston rings/barrells the excess gap is alowing the fuel mixture in yhe bores to leak past down into the the oil- engine may need major overhaul as this will only get worse

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1 Answer

Carburettor keeps filling with petrol and wont start

Hi, Rooneys_no1f and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
For more information about your issue please visit the websites below. Good luck and have nice a day.

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1 Answer

Just replaced the top end on my kx 125 1995 and now the carburettor leaks fuel constantly??????

the floats are sticking, tap on the side if that dont do it take it off and clean it

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My 90cc quadbike started leaking petrol from the

Check you float needle is not stuck ,and is not shutting of the fuel

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I changed a couple dry roted fuel lines and now i'm getting fuel coming out of a hose that is connected behind the carb

is it a clear but maybe yellowed hose? cut at an angle where it ends? this is the overflow for the carburettors float chamber. the float is either not floating (popped) or not sealing the valve when it comes up to the top of the camber (worn/dirty needle) - it could also have been dislodged and is jammed open, you need top take the top off the carburettor and clean the float, check it is not full of petrol (the float) , clean the needle valve and refit (if the float is punctured you'll need a new float) give me the details of any numbers and words printed on the carburettor and i'll give you a link where you can buy a new float and a guide to servicing the carburettor.
I'd give you a diagram but carburettors vary so much its got about a 99% chance of being useless, get me the info and i'll get you a step-by-step guide for fixing the carburettor.

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2 Answers

2003 yamaha roadstar leak fuel sometimes after I shut it off I think the floats are sticking any solutions. Rick

Yes Rick, try a couple of tricks I know.First,open the carburettor drain screw located at the base of the carburettor,this lets fuel flow out of the carburettor drain located next to/under it.(To acces this drain screw look between the engine cylinders from the LEFT of the bike)While the fuel is draining out,tap the fuel bowl.Next re-tighten the carby drain screw and see how that goes.I would suspect your bike has a vacumatic fuel tap that has 3 positions on it.1 marked on, 1 marked res, 1 marked pri.If the fuel leaks occur when in the on or res position this means part of your problem is a leaking diaphram in the fuel tap.Replace this & when engine isn't running,no fuel can flow to the carby when it's in the on or reserve positions.After ensuring the tap is ok, and trying the first trick,if it still leaks,well then you'll have to pull off the carby and give the needle and seat a clean.
Hope this healps Regards Andy Porrelli

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95 xv750 Virago fuel leak

Probabilly a stuk carburettor float or needle.
Try to solve this problem to gently tap on the carburettor bodies. If this doesn't help you have to clean out the carburettors, and/or replace the float neeldes

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