DGK, The marvel carb on my 1950 IH C is the same way. I even put 2 washers between spring and jet to keep jet in place. My carb has only one adjustable jet. It works backwards from what you would think. Turn it all the way in and fuel mix goes rich. Turn it all the way out and the fuel mix goes lean. Mine works great all the way out and I'm not taking it apart. My plugs were black and tractor drank gas when jet was all the way in. Now, the plugs look line new ones, all white.
So run yours for a while, then look at plugs.
I purchased a cheap sand blaster, spark plug cleaner from HF so I cleaned them and they work great. george
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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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