Farmall Cub - Carb tuning? after recent upgrades

Posted by dave in york haven pa on October 11, 2006 at 04:38:22 from (12.108.117.125):

I have a 1949 Farmall Cub which I recently replaced dist cap and wiring between dist cap and plugs, and replaced condensor and points and figured out how to re-gap the points. She's purring now. The only problem I'm having right now is what seems to be a fuel flow problem or a too-lean condition-I'm not sure, which is why I'm posting here, for expert opinions. I have a 5' mower deck which I use to cut field grass for years(always in 1st gear). The problem I'm having with the Cub now is when going up a hill, or on a level and engaging the PTO for the mower, the engine will sputter and die. It will restart just fine. My father-in-law says the carb is probably running too lean. I see the adjustment screw on the top backside of the carb which I'm assuming adjusts the air/unleaded gas mixture ratio. How EXACTLY do I adjust this to know when it is running at a more optimum setting? When running in neutral on a flat, I can turn it a couple of full rotations in one direction or the other, with no discernable difference in engine sound. Is the fine tuning also performed while running it in neutral and playing with the choke?
I also have noted on serveral occasions that sometimes the carb picks up a fine coating of gasoline, especially after I open the gas line prior to starting the tractor, and it leaks then. It 'dries up' after the tractor is running. I also noted that when the tractor is running, sometimes when it is sputtering around, if I gently tap the bottom or side of the carb where the float is, the engine seems to pick up power, as if it is getting more gas. What is my next logical step-replace the float? I'd appreciate detailed instructions here or a link to them on troubleshooting/fine tuning a carb, if that's what you think is the problem. I do NOT have the owner's manual, but I have a service manual on the Cub, but the procedure is not there-go figure.
Sincerely and with much thanks,
Dave Rhan

Replies:

• Re: Farmall Cub - Carb tuning? after recent upgrad John M 15:55:24 10/11/06 (0)
• Re: Farmall Cub - Carb tuning? after recent upgrad glennster 06:02:35 10/11/06 (1)
  • Re: Farmall Cub - Carb tuning? after recent upgrad Larry in WNY 09:36:49 10/11/06 (0)

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