Super M won't take throttle

[RickW]

i have a Super M puller with around 400 cubes. I have pulled it for 2 years and never had a problem. Now it sputters when you give it the gas quickly or when the govenors kick in. I have replace the plugs, the spark plug wires, the coil and have put another carb off of a 450 on it and nothing has changed. if you give it the gas slowly, it will run wide open perfectly. I also put a new distributer cap on it. It has an electronic ignition, no points. I have missed most of the season and need to get to pulling again.

 

[Super Trucker]

Check for fuel flow. Sounds like there is a blockage somewhere. Look inside the tank make sure it's clean. I once found a clear plastic wrap off a cigg pack in one,talk about a sob to find!

 

[MKA]

is the float stuck in the down position I had a similar issue and the float was hitting the bowl causing that exact same thing to happen

 

[rustyfarmall]

(quoted from post at 16:00:52 07/24/11) i have a Super M puller with around 400 cubes. I have pulled it for 2 years and never had a problem. Now it sputters when you give it the gas quickly or when the govenors kick in. I have replace the plugs, the spark plug wires, the coil and have put another carb off of a 450 on it and nothing has changed. if you give it the gas slowly, it will run wide open perfectly. I also put a new distributer cap on it. It has an electronic ignition, no points. I have missed most of the season and need to get to pulling again.

Have you checked for vacuum leaks? Could be time to replace that manifold gasket.

 

[Bryce]

water?

 

[mEl]

(quoted from post at 18:20:53 07/26/11) water?

While I do not claim any degree of knowledge about Farmall I do know that the main fuel passages have to be increased in the carb to handle that much bore. I can see how a stock carb off another tractor would not have enough fuel flow through the main metering circuit and would give the same symptoms. If I recall correctly there was a procedure which was done to the carb when even a simple M&W overbore was done let alone a major increase like you are talking. There are good IH builders on this forum who can help you, keep asking. mEl

 

[RickW]

Someone sent me an e-mail advising me to close the gap on my plugs and it cured the problem for now. I plan to install a MSD box today to help correct the problem so that i can open the gap back up on my plugs. Thanks to all for the great suggestions and your assistance in this. I really do appreciate all of the serious replies that i recieved.