It must be adjusted at very low RPM, down around 400 or so, about as slow as it will idle without dying. Be sure the engine is up to operating temperature.
The larger screw is the main jet adjust.
Turning it in leans, out richens.
Start by turning it in 1/4 turn, then open the throttle suddenly.
If it stumbles, back the screw out 1/4 turn try again.
Keep adjusting the screw until it will just take sudden throttle from idle, a single puff of black smoke is the goal.
You may have to fine tune the main setting under real load conditions.
Of course, the carb can only work as well as the rest of the engine. Good compression, spark, timing, plugs, all are necessary to run properly. There is a wire mesh filter inside the air cleaner canister, often overlooked. If it is clogged the engine can't breathe. If the gas tank is dirty, water contaminated, the carb will be also.
Many an innocent carb has been blamed for other engine problems!
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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