MF35 Fuel Problems

I have a 1961 MF35 project tractor that starts up great with no choke ever needed. It will idle fine as long as you want. The problem is that as soon as I put it in gear and put any load on the engine it wants to die. I have to pull the choke to keep it running sometimes, other times it still dies. Any help would be appreciated.
 
I would bet it's not getting enough fuel. Verify that there is a steady stream of fuel coming from the tank. Could be a restriction inside the carburetor. I had something similar with my TO35 even after soaking and rebuilding the carb. Seems there was still some dirt in the high speed circuit. Took it off again and went over it with a fine tooth comb (almost literally). After that, when you increased the throttle it would bark instead of sputter.
Actually I've gone through that on numerous occasions with my 202 as well, same story.
When you put load on the engine the governor's job is to quickly open up the throttle to compensate and bring it back up to the set RPM as quickly as possible. Without sufficient fuel, it will just sputter. Governor problems usually result in uneven RPM, surging or no throttle response at all, generally not sputtering.
 
I would say the mixture is too weak. This could be merely adustment at the main jet but more likely, especially if you have been disturbing things, dirt is in one or more jets. Before fiddling with the settings try cleaning the jets in the carburator or better still give the whole thing a though cleaning.
Sometimes, as a quick cure, a hand clapped over the intake suddenly when at full thottle will enable the engine to pull any blockage through, but it only works sometimes.
I wouldn"t touch the timing before I knew the fuel side of things was clean.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top