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M not running right

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bm3501466

02-02-2006 16:13:18

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What is wrong with my M farmall? When you rev the engine up by turning the throttle screw on the carb it runs just fine. If you pull back to throttle it up with the throttle handle, it pops and dies. Is this the governor doing this or what?

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MagMan

02-02-2006 18:08:54

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Re: M not running right in reply to bm3501466, 02-02-2006 16:13:18

sounds to me like an adjustment or rebuild of the carb. Try turning the screw on the bottom out a turn at a time and see if it works better the air adjust one on the side front you turn in to get more fuel but you adjust that at an idle and watch for black smoke then turn it out about 1/2 turn or so. JON

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Wayne Swenson

02-02-2006 17:42:03

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Re: M not running right in reply to bm3501466, 02-02-2006 16:13:18

#1. Loosen the 2 screws that are holding the governor tube & gently tap it so it "centers" itself then tighten the screws. Remove the top cover on the governor (has the pipe going to the top of the engine) and check governor to carburetor synchronization. With the throttle wide open, the clevis pin should just slip into the governor connecting rod that is in the tube. Adjust the clevis height if needed & lock the nut. You will need small fingers & a right angle needle nose pliers to make the job easier.

#2. With the engine warm & running at wide open throttle (WOT), turn high speed mixture screw in until the engine begins to starve for fuel. Then turn the screw out until the engine begins to blubber. Now find the "sweet spot" in between the two settings. If you are working the engine (plowing, etc.), then the high speed screw needs to be turned out 1 turn or more beyond the "sweet spot" to be sure the engine isn"t starving for fuel and can develop its rated power.

The same procedure can be followed for idle mixture with the addition of the ldle stop screw to set the low speed RPM.
On the "M" carb, the idle mixture screw is an air adjusting screw so turning in will richen the mixture and out will lean the mixture.
Aren"t carbs fun!!

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old

02-02-2006 16:52:20

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Re: M not running right in reply to bm3501466, 02-02-2006 16:13:18

Most likely a carb problem. May need to rebuild the carb and or check that its adjusted right.

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