Question about 1982 Honda CX 500 B

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Persistant problem of one carb flooding carb cleaned several times new needle valve fitted what now?

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Drain your tank and take off the fuel tank petcock. Look to see if the fuel filter is still intact/there. If it is damaged or missing replace it. The problem is rust in your tank. It causes the needle to stick open. You can turn your gas off and run your carburetor dry while riding to wash the rust past the needle to stop it from dripping while you ride. But the problem will persist until you fix the filter or add an additional inline filter to kill the problem at the source. I was having this problem 15 years ago with my CX500. To help stop tank rust always store your motorcycle with a full tank of stabilized fuel or for long storage (years)drain and coat the inside with storage oil.

Posted on Oct 03, 2010


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4 Answers

Why does the carb keep flooding?

In the absence of something like a faulty or porous casting of the carb allowing fuel to bypass the float valves then sticking or leaky float valves, sticking or punctured floats or an excessive fuel line pressure must be the problem.

Where no isolating tap is fitted to a gravity feed system the float valves must be virtually perfect and the only way to ensure perfect seating is to examine the surfaces under a strong magnification and then verify correct seating by using a vacuum pump and gauge.

An excessive line pressure can be caused by a blocked fuel tank breather.

Apr 19, 2015 | ATVs

1 Answer

I have a ccm 644,ever since I bought it,its leaked fuel from carbs,ive had carbs off 2 or 3 times,cleaned them,but every time I get it stop leaking and I put the bike away for a couple of weeks,next time I...

Flooding carbs often means that the needle valve that the float is supposed to close is leaking, causing the float chamber to overflow. replace needle valves.

May 06, 2014 | CCM Motorcycles

1 Answer

Carb set up

more information. was the carb removed from the car, when you say clean, was it taken apart. float/needle valves/etc. flooding is usually caused by the needle valve not properly reseating when the bowl is filled. how do you know that the carb is flooding.

Nov 17, 2013 | Chrysler Fifth Avenue Cars & Trucks

1 Answer

Gas floods into carburetor even with a new carburetor

The only thing that stops gas going into the carb is the needle valve and seat in the bowl of the carb.
Doing the same thing with 2 different carbs sounds like trash in the gas tank flowed into the carb and is holding the needle valve off the seat allowing gas to flow all the time.
Clean the tank. Clean the trash out of the needle valve/seat. Add a small engine fuel filter between the tank and carb.
You should be good to go.

Oct 07, 2017 | Troy-Bilt Troy Bilt Bronco CRT Garden...

1 Answer

HUSQI 22R TRIMMER, WALBRO WY CARB. Before and after a new kit too much fuel causing immediate flood out. This happened suddenly during use. As said, a new kit did not resolve the problem.

Hi and wlecome to FixYa, I am Kelly,
A couple of things cause this:
1. Damaged Float valve / needle tip (rubber missing or torn)
2. Debris uner the float valve needle not allowing the rubber of the needle to contact the seat.

Remove the lower diaphragm again... unscrew the float needle hinge pin and drop the needle out of place. Look for a damaged needle tip or damaged needle seat in the body of the carb. Clean out any debris and the mainifold to where the main fuel line connects from the tank. If the needle or seat is damaged replace them.

Before you re-install the diaphragm hook up the main fuel line, turn on the fuel to the carb. The needle and seat should prevent fuel flow until the float valve needle lever is gently depressed.
The float valve lever should NOT extend beyond the base of the carb. If it does it will overflow. Any adjustments to the float valve actuation lever are done in thousandths of an inch. Most of the time to get it right you may have to install the carb base and test fuel flow a few times.

This should resolve the problem. If not...Download the carb service manual / repair manual for your carb here:
Thanks for choosing Fixya,

Jul 16, 2011 | Garden

1 Answer

I have the 16 inch Husqvarna. Think its the 137. It will crank and then stop and when i pull the plug out it is bad flooded with fuel. Its like the fuel tank is building up pressure and flooding it. Does...

There tank vent is in the top of the fuel tank, you would have to remove the tank to get to it, it is a small plug and a duck bill valve, as this system only allows air into the tank and not out, there will always be a pressure in the tank, if the carb is flooding it is due to the rubber tipped needle under the metering diaphram leaking, not an issue with the breather, you realy need a small bulb pressure tester to test the needle seating, apply 2/3 psi into the fuel inlet conection on the carb, the needle should hold this with no like on the tester dial, if you do not have a tester all you can do is replace the needle and hope you have cured it, do remember that when re fitting the diaphram and gasget back on the carb, the gasket must go on first, and the diaphram last, it acts as a spacer, if you fit the other way round it will flodd because the diaphram is too close to the needle, the metering lever should be set level with the sides of the carb.

Apr 17, 2011 | Husqvarna "Chain Saw - 16" Bar, 3 Hp

4 Answers

1975 yamaha DT 175 it floods when the gas tank

I had the same problem - actually more than one problem:
1) Floats in the carburetor bowl (at the bottom of the carb) are getting stuck. Remove the carb; carefully disassemble the bowl & float assembly (pay attention to gasket orientation and don't lose the needle valve that the float-tab presses on!); use a carb cleaner from AutoZone or similar, and a toothbrush to clean all the parts. If carb is not too dirty, leave the jets and mixture-adjust screws alone (otherwise will have to re-adjust later).

2) Overflow tube is plugged (hence fuel in the cylinder instead of on the ground). Clean both ends of the brass-looking tube from inside and outside the carb bowl. Make sure you can blow through it or it is still plugged. Toothbrush and carb cleaner should do the trick. Replace the short flexible tubing that connects to the overflow on the outside of the bowl - transparent polyurethane tubing is less than $1 per foot at your local ATV/motorcycle shop.

3) Air Vent tube is plugged. Same thing as the Overflow tube but mounted higher up in the carb (not in the bowl). Clean it the same way and replace the flex tubing with another short piece of polyurethane.

4) Make sure the float-tab and needle-valve move smoothly. Mine was catching and getting stuck so I carefully "polished" the face of the tab with 400-grit emery paper, and then made sure to clean the area from grit. Smooth as a hot knife through butter now.

5) Set the float level by CAREFULLY bending the tab that pushes on the needle valve. On my 1981 175MX, float height spec is 21mm when just making contact with the needle. Yours may be different though.

6) Reassemble the carb after making sure all dirt and debris are gone. Use a new bowl gasket or at least put a good gasket-sealer compound on the old gasket. Attach the short lengths of transparent polyurethane tubing to the Overflow and Air Vent. When installing the carb, the Air Vent tube should just be 2" long and point out to the side; the Overflow tube should route through the frame near the swing-arm and point down to the ground.

7) MAKE SURE the Oil Feed tube coming from the AutoLube oil pump is connected to the carb (brass-looking fitting toward the cylinder-end). I replaced mine with transparent polyurethane tubing (different size than the Air Vent and Overflow), so now I can see that oil is being presented to the carb!

8) If the carb was nasty-dirty, you may need a new air filter. Mine was disintegrating. I recommend also putting an in-line fuel filter between the petcock and the carb, again using short lengths of TRANSPARENT polyurethane tubing (so you can see that fuel is flowing). You may also need to adjust & prime the AutoLube oil pump.

I highly recommend getting a Clymer manual (check eBay) which shows all these procedures and gives you the right specs for float height, etc. based on your model / year.

Aug 11, 2009 | 1974 Yamaha DT 360

1 Answer

Gas out of muffer.

Could be the needle valve in the carb is sticking open and flooding the mower. I would take carb apart and clean it. I use a fine wire to clean out any little ports and wipe the needle valve clean of dirt.

Apr 26, 2009 | FixYa Computers & Internet

1 Answer

Toyota 22r carb leaks and floods

sounds like trash between needle valve and seat try tapping on side of float bowl, if not take off air horn ( top ) remove float clean needle valve and seat and bowl keep a eye out for trash

Mar 31, 2009 | 1984 Toyota Pickup Deluxe

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