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Cub dies after 20 minutes
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Cub dies after 20 minutes
I apologize in advance that this question gets asked quite a bit. My brand new '49 Cub dies after about 20 minutes. It sounds like the gas runs out, but there is plenty of gas. Lines and carb have been cleaned. It sounds like the hot coil problem, but the case does not feel hot to the touch. Everything about the problem sounds like the overheated coil problem that so many have--is it possible for that to be the problem but not be hot to the touch? Anything else I am missing.
It sounds absolutely perfect until it stops. Takes about 5 or so minutes to be able to start again, and it starts right up.
Many thanks and glad to have my first Cub! This is a real nice one--came out of a garage of an old gentleman who passed away and took really good care of it.
It sounds absolutely perfect until it stops. Takes about 5 or so minutes to be able to start again, and it starts right up.
Many thanks and glad to have my first Cub! This is a real nice one--came out of a garage of an old gentleman who passed away and took really good care of it.
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Re: Cub dies after 20 minutes
Open gas tank when stops, if restarts then vent is obstructed.
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Re: Cub dies after 20 minutes
Yes, I tried that, and it dies with the gas cap off as well.
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Re: Cub dies after 20 minutes
Is the fuel shutoff valve fully open? When the engine stops, have you immediately opened the drain on the carb to check the fuel flow? There might be an obstruction at the tank shutoff valve or screen or even in the valve itself. Stan
Stan in LA (lower AL)
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Re: Cub dies after 20 minutes
Yes, valve fully open and brand new screen on sediment bowl. I have not checked flow out of carb yet and will give that a try. Thank you.
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Re: Cub dies after 20 minutes
Failure of a coil after running a few minutes is not necessarily a sign of coil over heating, may be a coil with winding opening or shorting to ground after it just warms a little. Check to see if you have a good strong spark from the coil when it dies. Condenser can also cause that.
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Re: Cub dies after 20 minutes
Ok, thank you!
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Re: Cub dies after 20 minutes
I would have to agree with John it is possible your coil is failing.Next time it shuts off check the temperature of the coil I would just abut guess you can't put your hand on the coil.
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Re: Cub dies after 20 minutes
There may be screen in the fuel inlet fitting/elbow where it enters the carb. Mine had the same symptoms and I found that the screen was plugged.
Mike.
Mike.
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Re: Cub dies after 20 minutes
I had a "bug" in the fuel system. Actual carcass of a beetle, in the top of the sediment bowl inlet. Flipped back and forth, stopping fuel, sometimes, and allowing flow, other times. I'm leaning to=wards coil issues, on yours, though.
Ed
Ed
- Trent M
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Re: Cub dies after 20 minutes
I'm with Ed, leaning towards coil issue. However, I've had similar symptoms with a failing condenser, like John said. So definitely keep that in mind too.
Trent McPeak
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Re: Cub dies after 20 minutes
If it's consistently stopping after roughly the same amount of run time each time, it's more likely to be ignition related than something random like a chunk of crud floating around in the fuel system. A bug would give you more random run times, while a coil overheating would take roughly the same amount of time each time.
Pull the center wire off the distributor cap and hold it near the oil filter housing while you crank the tractor over the next time it quits. That will tell you if you have spark.
Pull the center wire off the distributor cap and hold it near the oil filter housing while you crank the tractor over the next time it quits. That will tell you if you have spark.
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Re: Cub dies after 20 minutes
If you get an arc, then remove the distributor cap, rotor, and points cover.Matt Kirsch wrote:Pull the center wire off the distributor cap and hold it near the oil filter housing while you crank the tractor over the next time it quits. That will tell you if you have spark.
Observe the quality of spark from the center distributor wire and the color of the arc at the points. A yellow arc at the points indicates a bad condenser.
I have an excuse. CRS.
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Re: Cub dies after 20 minutes
As stated check fuel strainer at carb inlet
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Re: Cub dies after 20 minutes
Thanks for all the tips! Will try again as soon as the monsoon passes.
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