2N adjustments ??

Paul has good instructions but he comes at the settings different then some. He starts out rich and leans it. I start out lean (one-turn) and enrich it; end up the same place. But you can not set the main until the idle and throttle are set.

You get it adjusted right the engine smooth will take care of itself. Adjust the idle and throttle by rpm according to the instructions. Adjust the main according to throttle response and smoke.

Adjust max rpm at the governor by ear. You adjust it so the engine is very fast but not screaming. You adjust it to scream and then back off till it does not scream and even burbles some. "Smooth" will take care of itself.

Make all adjustments at operating temperature.

Adjusting the main that way will result in the engine stumbling when you open the throttle. The main should be set to the initial 2 turns and left there while you adjust the idle mixture. To do that you turn the idle speed down as low as you can get it to keep running and then adjust the idle mixture to get the highest RPMs, not the smoothest run. When you get the highest RPM out of it then crank the idle speed down again. Go back and forth until you get it as low as you can. Should be able to get about 400 RPM. Remember the idle jet is backwards. In makes it richer and out leans it out.

Now you can check the main jet by quickly opening the throttle. If it stumbles turn it out a quarter turn and try it again. If it does not stumble when you quickly open the throttle try leaning it out some by turning it in a quarter turn. If you get black smoke you are way rich and can turn it in a half turn. You want it to accelerate smoothly but not blow black smoke which is unburned(wasted)fuel.

From reading many of your posts I think you are a little too hung up on the idea of smooth. These things are not Rolls Royces. Their design is a compromise and they will pop once in a while while they idle but they were not made to idle they were made to run all day at 1500 RPM pulling a plow very economically.

Just MHO.

Paul K.

" Normally start with the main needle and the idle adj(on the outside)2 turns out..Crank and let it warm up. I turn the main needle in till it stumbles then back out till it is smooth. I adjust the idle screw at low speed till it runs the best/smoothest then adjsut the screw on the back of the carb for lowest speed...This afternoon is the first time I have had time to play with it a little..I even put my Zenith carb back on it and have the same results..Zenith is adjsuted as follows: T-shaped screw on bottom out 2 1/2 turns and idle screw out 3/4 turn..warm it up then at 3/4 throttle turn in the T-shaped screw till it stumbles then back it out till it smooths out. Then adjsut idle screw till smooth slow idle(This is per salesman/owner at Farmer"s service where I bought it..."

That procedure will not do.