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Farmall M Stalls Under a Load

D

DieselDale

New User
I. just resurrected a very nice barn find. 50 M with all the options. Sheet metal and factory paint in great shape. Engine was seized from 12 years storage in the barn. (It's a little humid in Texas)Did complete In-Frame Pistons,sleeves,valve-grind, the works! Starts and runs great EXCEPT under @ load. Ex; 5th gear start-offs.I tanked and overhauled the carb. I have the main jet needle backed out to the last thread for best results. It works better with some choke? Could the dome top piston require a fatter fuel mixture? Should I explore upsizing the main to compensate for modern fuel? or might it be an advance problem? The original pistons wre pop-ups.The engine runs and sounds great until you ask for power. Points are set @.020 (It's a non-magneto) The carb is getting adequate fuel to the bowl.
Any suggestions?
 
sounds like a fuel problem, but eliminate the distributor first. pull the cap and see if the rotor snaps back a little if you turn it. timing is set static, motor off on tdc, if you have a timing lite toss it on there and see if the timing advances when speed is increased. if all good, go back to the carb. there must be a restriction somewhere. the carm on the m will put a lot of fuel through it when the tractor is working hard. with your main load jet all the way out, that thing should be smoking like a detroit deisel.
 
Thanks Glennster I will put the strobe on it but I am starting to think I must have missed something in the carb Main jet passage.
 
That tractor should run and have plenty of power with carburetor main fuel adjustment screw set at just 3 turns out. Yes, you missed some crud in the carb, or the float is not set correctly.
 
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