Question about 2003 Honda CB 750 Nighthawk

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Carberator gas bowl drain tube leaks gas. Screw is tight. Sorry I couldn't find an atv category.

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The float is stuck open. Remove the carb, remove the bowl then clean the carb with spray carb cleaner.

Posted on Sep 30, 2009

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Sounds like float is sticking in carb,could be a stuck needle or a bad float

Posted on Sep 30, 2009


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Posted on Jan 02, 2017

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Cheapy 4 wheeler is leaking gas bottom tube of carb.. took apart and cleaned float is working put back together still leaks???

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Float height of carberator please

you adjust it by bendng the small tab on the float that presses on the end of the float needle,to check it is right find a length of clear tubing and put it on the small pipe bit that is on the bottom of the float bowl ,then bend it around the carb and point it upward s,then undo the drain screw on the float bowl and the fuel will come up the pipe and when it stops that is the same level as the fuel in the float bowl.its usually about 2/3 of the way up the float low and it can starve it of fuel and too high it will flood and leak out.

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I have a 2005 honda rancher and when i give it gas i chookes out,but will sit and idel

On the bottom of your carbeurator (very bottom of the bowl) there should be a drain screw/plug. Turn the fuel petcock off, then loosen the screw to drain the sediment bowl. When it is done draining, turn the fuel back on and let it drain through for a second, before tightening the drain screw. The bike might take an extra few seconds to start, just needs to refill itself with fuel. This usually resolves that problem, i've had it happen on many ATVs/Motorcycles in the past. Could be water or sediment in the bowl, or a sticky needle valve. Good luck.
NOTE: use care when draining, about a cup of gasoline will be lost; use a container to catch fuel.

Oct 23, 2011 | Husqvarna , No.455 Rancher, 20" Gas -...

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1982 yamaha yz490, I checked the fuel flow and all is good? It has 120 psi compression? And I put a new plug in but still wants to run for a few seconds then die? When it's not running It also leaks...

If it's leaking from the bowl drain, the drain screw isn't seating in the drain hole. Shut the gas off, pull it out and clean the tapered seat it seals in. I know you said you cleaned the carb, but if the float needle isn't seating, it would leak out the overflow and flood out the carb as well. Check out the float-if it's brass, shake it and listen for gas inside. If it's plastic, put it in a cup of gas and see if it floats. They do get saturated over time and need to be replaced. Good luck!

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1985 yamaha virago carberator problems... gas leaking out of the carberator ..took it off ,cleaned diaphram . still leaks gas after we shut if off, also sprays gas out of exhaust when throttled

Hi, Carol 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 and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
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Dan Motorcycle
Yamaha XV 535 DX Virago Service Manual
OEM parts for Yamaha

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Carburators leaking gas leaking from carb bowl overflow tube

Tap the bowls with a screw driver handle while the gas is turned on. Your floats are sticking. If that doesnt work then you have to take the bowl off and make sure your floats are not bent.

Jan 10, 2010 | 1981 Honda CBX

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Help 07 polaris 500 sportsman 500ho cranks but will not start backfires only. changed gas cleaned carb cleaned fuelpump new filter 80 lbs compression new plug.points under thottle leaver has gap can not...

All most positive it is in your carb take the bowl off it as you take it off there is a small tube that hangs down that all most reaches the bottom of the bowl need to take a small wire and push through it it is blocked .symptoms backfiring no idle coughing and sputtering if it does start

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3 Answers


Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. Any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the two screws on the outside throat of the carb and spray into the screw holes as well.
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. Set the idle speed with the idle screw. This process should get you back on the road.

Since you mentioned uneven idle revs, be sure the carb and manifold are on tight and also tighten the cylinder and head. Air leaks can screw up the idle.

Please rate this solution. Thanks speedfreak41

Apr 04, 2009 | Yamaha SR 125 Motorcycles

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