Farmall Cub stalling out

JacobMo · Oct 11, 2011

Hey Guys, my 48 cub starts right up and runs ok in first gear but in 2nd and 3rd the engine stalls out when you release the clutch. It will also stall if you advance the engine speed control lever to quickly. I can get it to move in 2nd gear but its sluggish. Do I have a timing problem. Thks Jack

Anonymous-0 · Oct 11, 2011

If you haven't done anything to change the timing, I would doubt that's a problem. It sounds more like a fuel problem to me. First check to see if the sediment bowl is clean and good flow from tank to it. Check fuel line from bowl to carb., Then maybe the carb. needs cleaning. Good Luck

JRSutton · Oct 12, 2011

Quick check - see if it stalls with the carb choked (half way or so). My first guess is that the governor's opening the carb up more, since more power is needed for the higher gears, and it's starving for gas.

If the problem goes away while choked, then you're not getting enough gas THROUGH the carb (clean it).

(If choking it doesn't change anything, it doesn't mean your carb IS ok though.)

You might not be getting enough gas INTO the carb in the first place, less likely (since it runs in low gear), but worth checking. Check your fuel line.

I'd also check for a weak spark, and clean points. Very possible it's an ignition problem.

I'm also a big fan of adjusting the valves anytime you have any kind of engine trouble. Just because.

While it's running ok in low gear, what happens if you go up a steep hill? Does the govenor maintain a steady ground speed (increasing the rpms)?

JacobMo · Oct 13, 2011

Thanks Guys, I'm going check it out today. Ive got a mag on this tractor. I'm thinking its a fuel problem also. In first going up hill it maintains power but overall seems week. Jack

Farmall Cub stalling out

JacobMo

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Anonymous-0

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JRSutton

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JacobMo

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