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M coughs under load

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Moses

11-28-2001 08:43:21




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My M runs fine until I put a load on the engine (plowing snow), then it coughs and sputters. The only thing I have messed with is the electrical system. Would a bad ground cause this? Or, what else should I look for?




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coolguy

07-06-2003 20:02:20




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 Re: M coughs under load in reply to Moses, 11-28-2001 08:43:21  
its not getting GAS change plug wires and plugs and clean the carbrator



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Moses

11-29-2001 09:43:07




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 Re: M coughs under load in reply to Moses, 11-28-2001 08:43:21  
I think it just isn't getting warm. I was running it last night, and after a while it started running fine. Then I noticed that the temp gage was getting near hot, so I shut it down. After refilling the antifreeze, it went back to running crappy, and it never warmed up. I didn't have any such problems this summer.

I don't have my manual handy - is there a thermostat in there somewhere? If so, where can I get one?

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Chicken George

11-29-2001 02:49:24




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 Re: M coughs under load in reply to Moses, 11-28-2001 08:43:21  
Plowing snow, burr!!!! gets me to thinking of water maybe around the plug wires, dist. cap from snow.Winter, Burrrr!! cold engine? maybe a plug fouling should think about that, wouldn't cost anything to look at the plugs, Just a "COLD" thought luck!



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Curt (WI)

11-29-2001 00:10:23




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 Re: M coughs under load in reply to Moses, 11-28-2001 08:43:21  
I had the same problem on the 340 while plowing snow. I took the sediment cup off and dumped the water and crud out and added some isopropyl to the tank. It's running much better now. Maybe your problem too, maybe not. Easy fix if it is anyway.



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Andrew

11-28-2001 21:16:52




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 Re: M coughs under load in reply to Moses, 11-28-2001 08:43:21  
I'll bet anything it's some crud(rust particles) blocking your fuel line. Something from the tank that's been stirred up.

Anyway had to add my 2cents
Sorry
Let us know how you get on



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Charlie

11-28-2001 15:06:09




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 Re: M coughs under load in reply to Moses, 11-28-2001 08:43:21  
You my want to take look at your manifold. A cracked manifold or a loose manifold could create lean mixture type symtoms since a piston would be sucking air instead of gas.



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Bob kerr

11-28-2001 14:02:28




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 Re: M coughs under load in reply to Moses, 11-28-2001 08:43:21  
If it is cold out and the carb or manifold isn't completly warmed up it could act lean because the fuel hasn't quite vaporized. The carb may be adjusted ok but the liquid fuel will not burn when it needs to and cause a sputter. If that is the case check the oil regularly . If it gets thin or smells like gas, change it.My Dads Ferguson is pretty good sputterer when it is real cold out. It helps to shield the manifold and as much of the carb as possible with tin foil if super cold out.

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Steven@nd

11-28-2001 08:51:19




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 Re: M coughs under load in reply to Moses, 11-28-2001 08:43:21  
Coughing under load I think is a sign of a lean condition. To check before adjusting anything, pull the choke a little bit when it coughs. If it runs smooth when you pull the choke, you will need to adjust the high speed jet (the one on the bottom of the float bowl). Turn the jet out (counterclockwise) to richen the mix.

Hope this helps.
Steven



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Moses

11-28-2001 08:54:21




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 Re: Re: M coughs under load in reply to Steven@nd, 11-28-2001 08:51:19  
Could that have "un-adjusted" itslf? I never had this problem before - it just popped up all the sudden.



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The Red

11-28-2001 09:08:28




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 Re: Re: Re: M coughs under load in reply to Moses, 11-28-2001 08:54:21  
Sounds like fuel flow restriction then. Shut off the gas and unhook the fuel line at the carburetor. Turn it back on and see if you are getting a good flow. If so, then remove the screen filter from the carburetor and inspect. If the flow is not good, then you will need to remove the bowl and turn the gas back on. If you have good flow, then you have a restriction in the line. If the flow is not good, then you might have a restriction in the strainer assembly inlet pipe. While you have the bowl off, inspect the bowl screen.

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Steven@nd

11-28-2001 08:58:02




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 Re: Re: Re: M coughs under load in reply to Moses, 11-28-2001 08:54:21  
Sometimes it can, the packing can deteriorate and then the screw can move, or else if it has a spring on it the spring can get weak. I usually have to adjust the screws on the carb of my Super MTA everytime I use it, not sure why but it could be temperature and the specific load I put on it.

Another thought is that maybe a rust particle or something plugged one of the passages in the carb.

Steven

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walt f

11-28-2001 15:52:40




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 Re: Re: Re: Re: M coughs under load in reply to Steven@nd, 11-28-2001 08:58:02  
i had the same problem, turned out that i had water in my fuel. the water settled in the bottom of the carb and set up rust. the rust broke loose and clogged the load jet in the bottom of the carb.



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