Re: 1947 M Carb help

Posted by shannon on August 24, 2001 at 10:19:27 from (146.186.40.20):

In Reply to: 1947 M Carb help posted by Alabama on August 24, 2001 at 06:16:06:

hello,
i am 99% shure about the following, i would have t refer to my i&t manual to verify it. i have a 450 and the carburator is for the most part identical to the m's, it may very in venturi and fuel jet, but the adjustments are the same. if it has been sitting for a while you may want to check your needle and seat to make sure it is still good. if this is bad then the fuel will not stop flowing into the carburator when your float floats. the previous would be more than likely true if it burns black smoke constant, that is at idle and at wot (wide open throttle). if it only smokes at idle then your idle mixture is too rich. or if it only smokes at wot then your main adjust screw is set to rich. the book explains about how to set it (idle mixture) according to how it sounds ( turn it left until it sounds rough, turn it right untill it sounds rough, then set it between those two points where it sounds the best) but the best way is to find someone who has a pto dynometer and set it that way. as for the adjustment locations: the main adjustment screw, which should be set at wot under a load, is the screw directly below the shaft that runs from the governer to the carburator this should be factory calibrated with a set number of turns (i think it is 5 for a 450 but that is probably different from the m due to the afforementioned differences but if you cant find the factory setting cou can guestimate how rich it is by the color of the exhaust (black rich clear good) and the sound the engine makes lean makes it "pop" this is bad, but for better acuracy you should do it on a dynometer since you should set it under a load anyway) from when it is seated (fuel shut off; clockwise) if it is only running rich at wot then this is your culprit. counter clockwise(screw gets screwed out from the carburator) richens clockwise(screw gets screwed into the carburator) leans.
the idle speed adjustment is located in line with the shaft that connects the governer and carburator this just sets your idle rpm. the idle adjustment screw is located near the idle speed screw i am pretty sure it is clockwise for leaning it out and counter clockwise for a more rich mixxture. this adjustment had absolutely no effect on the wot mixture, but the main adjust screw can affect the idle mixture. this would be what you have to adjust if it is smoking at idle.

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