The needle valve problem you are experiencing isn't uncommon. Buy a CIH needle valve & seat seems to help but still isn't a cure-all. I've had brand new ones cause problems. If you get one that works for very long feel fortunate. I think it is a combination of the vicon used on the tip & today's unlead / ethanol gas.You might try adding some lead substitute to your gas, may or maynot help. We've just gotten to the point where we shut the gas off at the sediment bulb housing whenever we shut the engine off. PIA if your using your tractor much but it works.
As for the plugs, I gave up on Champions about 5 years ago and switched to Autolite after running Champions for over 50 yrs. 386s seem to be the most recomended but I still had some fouling issues with them so called Autolite. The tech I talked to recomended 3116s for the IH 4 cylinder engines, said 386s were for the 6 cylindwer engines. Since switching to the 3116s we have had any problems with plug fouling. I have an M, 2 SMs & a SMTA. The tractors are "toys, don't use them to farm with other than on augers unloading corn & beans from bins
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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