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Discussion Forum

Carb woes

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08-20-2002 06:29:21

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hey everybody. i just rebuilt the carb on my '52 cub with a kit that did not contain the float. got that sucker good and clean with some napa carb solvent, cleaned out the tubes, replaced the parts with what was in the kit, then put it all back together. ok, i thought everything was done until i got her started. she will only run when she is choked. once i start letting even a little air in, it dies. im not that good with these things and would appreciate some thoughts on what could be wrong. i used an old float i had, which looked pretty good, however i did notice that the new needle that came with the kit, seems to almost stick when i lift the float up all the way. i tinkered with the sediment bowl also. it was leaking gas really bad. i put a new screen in it and a new washer. it seemed to seal very well. once i turned on the gas, then bowl didnt fill up until i hit the starter. is this the way it is suppose to be? any thought you all might have would really be appreciated.

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Bus Driver

08-21-2002 05:07:02

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 Re: carb woes in reply to wvhogleg, 08-20-2002 06:29:21  
Just read the other posts and found a goodly amount of really bad information in some of them while others offered real help. The choke does not do anything to help fuel get TO the carburetor. If choking makes an engine run reasonably well, the fuel flow TO the carburetor is probably OK. A leaking float (from a pinhole in the float) will result in a flooded engine. The choke controls AIR FLOW, which when restricted at the choke location, indirectly causes fuel flow into the engine to increase. That flow is fuel that is already in the carburetor. Cub carburetors do not have to be disassembled to clean the main jet. Using a 3/8 hex or open end wrench, remove the brass "nut" in the side of the carburetor. Using SMOOTH wire, clean the tiny hole in the end near the threads. Do this several times and blow out with compressed air each time. Do not alter the size of the hole. Reinstall-careful with the gasket-the carburetor can leak here too. See if this 5 minute procedure helps.

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08-20-2002 17:39:35

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 Re: carb woes in reply to wvhogleg, 08-20-2002 06:29:21  
wvhogleg, I would check a couple things first before ripping the carb apart again.1)make sure the vent in the gas cap is clear and not plugged,2) make sure your getting fuel flow out of the strainer assembly alot of time they will plug where they go up into the gas tank.if you are getting suffient fuel to the carb then something is wrong in the carb or adjustments obviously,I highly doubt there is a problem with the float itself because if there was a hole in it the tractor would flood not starve for gas.There is a measurement for the float in the instruction pack I can't remember what it is off the top of my head,make sure you check that,as long as everything is clean and all gaskets are in there it is most likely something simple.Good luck Justin

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08-20-2002 15:15:46

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 Re: carb woes in reply to wvhogleg, 08-20-2002 06:29:21  
I bought a '57 Cub lo-boy 2 years ago, and used it approx. 6 weeks mowing, then it started to act as you describe.I did the fuel strainer routine, I did the basic carb rebuild, seemed to be fine for about 2 cuttings, then same business, after 1 too many cups of coffee one saturday night I decided to end the mystery, armed with another carb rebuild kit, I went at it.I had been told that the carb was a new rebuild installed only as a last resort to make my delivery. I had faith., Well, as fate would have it,the person who rebuilt it was a butcher(HACK). I had found that the reason it would only run choked was because of an internal leak in the gasket between the upper and lower halves.I cleaned the two pcs well and checked for flatness,I had a 1/16 inch rock in the lower(float) section. After alittle tapping with a plastic hammer and some filing, with a fine cut file I was able to mate the two pcs, however, I used a liquid sealer on both sides of the bowl gasket, let it set up for about 15 min., then assembled, put the rest of the unit back together and let it set and cure overnight.I haven't had a problem since.There are other things not correct with the carb (a IH dealer rebuild )that I won't mention, but she runs well and I learned a few things. Hope this helps and sorry it's so long. Good luck-TractorChuck-

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08-20-2002 09:58:28

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 Re: carb woes in reply to wvhogleg, 08-20-2002 06:29:21  
It sounds like your float is to low and won`t let gas in the bowl. Adjust the float, with the carb upside down and the bowl off the float should be level with the carb, make sure that the wire keeper that goes between the needle valve and the float is hooked up. You should be able to blow thru the gas line and see if it`s working. I know what I mean but it`s hard to tell somebody else. lol kevin

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08-20-2002 09:53:46

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 Re: carb woes in reply to wvhogleg, 08-20-2002 06:29:21  
Since it will only run with it choked I disagree that you may have a hole in your float, if you did gas would be pouring out once the float filled and sunk. Your problem is lack of gas, check that you have good flow to the carb from the sediment bowl, either by removeing the line from the carb or by pulling the plug on the bottom of the carb. You should have a good stream coming out with the fuel shut off open. If you have good flow into the carb then the only thing left is that the main jet passage is blocked preventing the fuel to flow thru the carb. If that's the case then you will need to take it apart and clean it again.

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08-20-2002 07:10:39

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 Re: carb woes in reply to wvhogleg, 08-20-2002 06:29:21  
You will most likly need to take the carb apart again. Check the float for pin holes (submerge it in a can of gas). Make sure that you adjust the float correctly. Also, I have had carb kits come where the needle valve was rubber tipped, I have not had good luck with those; they seem to stick.

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08-20-2002 07:07:19

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 Re: carb woes in reply to wvhogleg, 08-20-2002 06:29:21  
A good tip I learned from someone on this site is to remove the plug that drains the carb, screw in a barbed hose connector and slip on a piece of clear tubing, turn it up and you will be able to see where the fuel level is in the bowl, kinda like those coffee pots with the glass tube on the side.

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08-20-2002 06:50:17

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 Re: carb woes in reply to wvhogleg, 08-20-2002 06:29:21  
Sounds like to me you have a couple of problems. First, you may have a hole in your old float. If a float has a hole in it, gas is able to seep in and keep the float from allowing enough gas into the carb. This would require you to choke the tractor for it to get enough gas.

Second, your sediment bowl should fill as soon as you open the valve. Sounds like you have an obstruction somewhere.

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08-20-2002 09:52:36

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 Re: Re: carb woes in reply to farmalittle, 08-20-2002 06:50:17  
Sediment trap should not fill fast if Carburetor has not been drained as there is an air lock if all is sealed up properly. The fact that his filled when he engaged starter is some indication that the needle is seating and bowl gasket not leaking

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