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ChadS
08-29-2007 08:57:01
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Re: Farmall M 100HP...carb problems in reply to masseyman30, 08-22-2007 20:57:53
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Ok, what I would do, is get a stock metering stem. If the holes in the stem are too large, it will flood from allowing too much fuel to exit the main jet. See, how these carbs work is,, They have more than one fuel port. Used to be, the M style carb had just an idle circuit, and the main load jet. The newer carbs, have 2 main fuel delvery locations, (idle not included) to deliver fuel into the manifold. Now, if the main jet and stem is too large, it will overflow the already flowing fuel entering the manifold. Hence, when you try to lean out the main jet, you get a hesitation and idles better. I do belive the .104 bit is small, and you can step up to a .120 bit for the main jet,,,, but the metering stem is too big, flowing way too much fuel. It takes the fine tunability out of the carb when its either lean, or way to rich, nothing inbetween. A stock stem will cut back on the fuel flow out of the main jet. After the main jet is enlarged, try it with the stock metering stem, see if any improvments show up. The idle should clear up, but will possibly have a stutter, but hopefully you can richen it up from the jet increase to compensate, but not overfeed. Now, if you do need a little more fuel, than what you are getting,,, you can enlarge the BOTTOM TWO HOLES in the metering stem a few sizes larger. This will let more fuel in, but not too much. Blow the carb out really good, (wear glasses) Make sure each and every passage is clear and open. What size was the venturi???? measure the narrow part of the venturi and report back. Now, have tou done any upgrades to the IGN? ChadS www.thetractorshop.com
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