Re: 39 M won't run smooth; HELP!!

Posted by Wayne Swenson on March 15, 2006 at 20:57:08 from (24.181.155.110):

In Reply to: 39 M won't run smooth; HELP!! posted by ih650 on March 15, 2006 at 20:19:21:

I think you need to check the governor-to-carburetor synchronization.
These adjustments are done with the engine off.
1. Loosen the 2 screws that are holding the governor tube to the governor housing & gently tap it so it "centers" itself then tighten the screws.
2. Remove the top cover on the governor housing (has the pipe going to the top of the engine) and check governor to carburetor synchronization. With the throttle lever set 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 may need small fingers & a right angle needle nose pliers to make the job easier. Does the governor spring need replacing?
3. 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.
4. The same procedure can be followed for idle mixture with the addition of the ldle stop screw to set the low speed RPM.
5. 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.

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