Switching brands of plugs will do little , it is all about type and heat range of plugs. I always use champion, have for 55 years. A little lube on the tip of that needle valve may well solve your problem. A viton tip will always hold better than steel with less pressure from float. That is why they changed to them. IH 4 and 560's with their larger fuel tanks put a little more pressure on the needle valve than previous models and all the carbs leaked brand new so IH went to viton tip. Problem with the new one is quality control. The hole in seat is often times oblong and needs to be coined to work well. Does ethanol affect them,possibly as I have found that it will harden the rubber hoses used on fuel lines in a year or two of use.
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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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