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 - Bad Vibes - by Curtis Von Fange. One of the strangest ways to communicate with our tractor is to ask it how it feels. "Ask it how it feels," you say? Yup, ask it how it feels. Now, as with the other articles in this series one has to be able to hear what 'ole blue' is trying to say in response. The nice thing about our old iron friends is that they are usually quite consistent in their response, rather unlike some people I know who might change what they say due to the weather or other mitigating circumstances. But since t
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