Posted by Wayne in MN on December 03, 2007 at 19:18:50 from (66.188.158.31):
In Reply to: H questions posted by Lee Cramsey on December 03, 2007 at 18:55:57:
These adjustments are done with the engine not running when the carburetor has been removed & replaced. 1. Loosen the 2 screws that are holding the governor tube to the governor housing. Tighten the tube-to-carb screws; gently tap the tube so it "centers" itself, & then tighten the tube-to-governor 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 operator's 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. Return throttle lever to idle.
3. Idle air screw is set at 1˝ turn out to start with; high speed mixture screw is 2˝ or 3 turns out. 4. With the engine warm & running at wide open throttle (WOT), turn high speed mixture screw (on the bottom facing down to the rear) 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 ˝ turn or more beyond the "sweet spot" to be sure the engine isn't starving for fuel and can develop its rated power.
5. The same procedure can be followed for idle mixture with the addition of setting the idle stop screw (just to the rear of the governor shaft tube) to adjust the low speed RPM. On the "H"& “M” carb, the idle mixture screw (faces to the front just below the idle stop screw) is an air adjusting screw so turning in will richen the mixture and out will lean the mixture. Repeat the procedure again to make sure “all is well”.
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