headed South fast you might want to spend a bit more time on that main adjust than "1-1/2 turns and LEAVITT!!!" Or is it 1-1/4-turn? Typo? Anyway, too rich screws up the lube, cylinder wall especially, allowing a lot of unnecessary wear, and wastes a lot of fuel doing it, while lean runs hot hot hot increasing wear and tear and both take hours and hours and hours off the life of the engine. Back it out 1/4-turn at a time until the engine picks up without hesitation rolling in high gear when you apply some brake (load the engine) as you give it 1/2-throttle. If it puffs smoke when you do that then turn it in 1/8-turn should clear that puff and leave you within 1/16-turn of exactly right. Adjust the carb only after the engine warms to operating temp. But who knows the difference between an engine that goes 4,000 hours between rebuilds and one that goes 5,000 hours? Maybe that could be the difference between a "good enough" main adjustment and a more precise main adjustment. But then the difference could be the motor oil a guy uses; or other stuff like air cleaner maintenance. But if it is all wrong then the engine will cost more to operate and it will not last near the hours as an engine that has had attention paid to all the small stuff. 200-hours here, 500-hours there, 300-hours because of that, and 15% or 20% less gas mileage then before long you are talking real time and money.
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