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 - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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