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Discussion Forum

WC Carb Problems

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07-11-2000 06:52:59

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After 8 months I finally have has a few minutes to work on my hard starting, backfiring WC. Restarted after setting many years, the tractor allegedly ran good then started missing. I rebuilt the carb finding worn needle and sunken float. When I put it back on it still backfired and would not run at all. I cleaned and rest the points, installed new condensor, retimed the mag - that made it worse. I then retarded the spark as far as possible. It then started puffing through the muffler not the carb so I suspect the timing has jumped a gear. I did get it to run for 10 seconds (twice).

Now, as soon as the carb gets full of gas, gas runs into the throttle opening and out the drain hole. While this seems to have helped with the starting thing (I had to turn the idle jet way in and the high speed jet way out to get it to run), raw gas dripping out of the carb is not right. I pulled the bowl, the float is dry and known to work (came from another of my tractors that actually ran), it has a new needle, seat, and gasket.

What have I missed?

Oh, it does this no matter how little gas is in the tank, or how much the fuel feed is cracked open. If it sits more than 30 seconds fuel starts running out (and I'm not talking a drop or two).

When my wife has a minute, and it stops raining, I'm going to use pipe dope on the needle seat threads, reinstall it, seat the needle by hand, and have her turn on the fuel. If that stops the gas flow I'm going to lower the float and hope for the best. Any other suggestions? Thanks guys.

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Gordon Chance

07-16-2000 07:19:39

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 Re: WC Carb Problems in reply to D13, 07-11-2000 06:52:59  

I don't know if this is your problem or not, but it acts just like a carburetor that was on a tractor in the shop that I worked at about 18 years ago. One of the young mechanics working at the shop at the time had just rebuilt this carburetor and when he turned the gas on it would run out of the carburetor after a short amount of time. After he had the carburetor off a few times to check the float, float level and needle valve and seat, he came to me for help. What I found was that the new bowl gasket did not have a vent hole to vent the air from the bowl. Without the vent hole, the air in the bowl was trapped and when the gas started to flow into the bowl the trapped air would force the gas to go up the main tube and out before the gas level could rise high enough to shut off the needle valve. This may or may not be your problem as I have not seen this again, but it is something to check for. Good luck.


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Mike (MI)

07-11-2000 10:11:41

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 Re: WC Carb Problems in reply to D13, 07-11-2000 06:52:59  
It is possible that the gasket between the two halves is keeping the float from moving up as far as it needs to. If the float does in fact float, and nothing is keeping it from moving when it's installed,(and the float lever is set), then the needle won't seal in the seat. The needle should seal the fuel no matter how far the valve is on or how full the tank is. If the seat went in and bottomed good , I can't see fuel leaking past the threads. Is the seat square in the bore? Hope you find the problem.

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07-11-2000 10:10:52

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 Re: WC Carb Problems in reply to D13, 07-11-2000 06:52:59  
I had the same problem with my Zenith carb. Gas leaked. The needle isn't seating properly. I had mine apart more times than I want to remember. I checked for dirt, proper float height, rough edges in the seat, etc. Finally it sealed.
I had to take it apart again for a different problem and I saw that gas residue had built up on the needle and a little wearing occured around the tip of the needle, and I think these two things created it's own seal.
Good luck

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