Posted by Repairman60 on September 26, 2020 at 12:42:41 from (12.36.232.41):
Apologize for the length of this post from the get go.
First some background. 1953 MM BF my dad purchased a few years ago apparently from someone flipping "restored" tractors. When he got it would run okay 10 15 minutes then die sit a few hours same thing again. Long story short time constraints, sickness he never got around to working on it. Since he passed thought I would tackle it as I have been through a few other tractors he had getting them running. Tank had been lined but did not hold. Removed tank, carburetor, tore carb apart it had been reworked not in bad shape but dirty, rusty nothing too bad compared to other tractor carbs. Put an auxiliary tank to reinstalled carb cleaned points started right up but had a miss did not drive as aux tank was stationary.. Checked compression, new plugs, ran fairly good but had some blow by, smoke out oil filler tube. Cleaned tank extensively reinstalled. Started but still a miss. Replaced coil, wires, points, condenser, idles real smooth when first start. Give her a little throttle starts missing almost like a lope or surge. Load her a little smooths out. Took carb apart again in case something from tank had got in. Fairly clean reinstalled. Not knowing what had been done previously but assuming timing okay as it ran okay for 10 15 minutes just thinking that tank lining failure may been cutting of fuel supply causing original issue my dad had with it. At present time I think she is flooding out. I can give a little throttle drive her in 3rd gear running fairly smooth, if I shift to 2nd or changing throttle she starts sputtering and jerking. Throttle down a tad smooths out eventually. I think if load matches throttle runs fair. I put a 6ft flail mower on her mowed in 2nd gear did okay as long as all things remained constant. The carb does not have a high speed adjustment. The air mixture screw makes a tab bit of difference at higher rpm but not much. At idle it will smooth her out. I am thinking it is getting too much fuel if she is running half decent and give her a good amount of throttle at once black smoke. Pulled plugs black and sooty. She starts real easy has been converted to 12 volt. Am I barking up the wrong tree? Could it have the wrong high speed jet in carb? How do you determine that? Can a smaller jet be installed and drilled out to match the engine? She has the Hercules IXB3 engine M&S carb not sure the number need to clean the paint off tag. I would check timing but do not have a light may need to call in some help. I have double checked firing order and wires. Moved wires on distributor one space made everything worse. Thoughts and suggestions appreciated.
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