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Turn both low and high adjustment screws carefully clockwise all the way in - do not overtighten.. Then back out each two full turns. Set the idle speed control for highest setting. Prime and start and let it run and warm up for about 15 seconds - then lower the rpms a tad and then adjust the low end screw for highest rpm. Then reset the idle to lower reasonable level. You may have to go back and forth with those two adjustments till it runs fine at low idle speed..
Then accelerate to highest speed and set the high adjustment for highest rpm. Then go from idle to high speed. If not smooth a small adjustment on the high speed screw is in order. Keep doing that until you get a nice smooth transition form low speed to high speed.
The idle air screw is on the side of carb. the high speed requires a special 90 degree screwdriver. This allows access to the high speed jet which is on the bottom of carb...Adjust idle screw till smooth idle is obtained. Adjust high speed while running to obtain the highest RPM.
The idle is set too high. Check on the left side of the engine, about mid point of the jugs "V", you should see a knob near the middle. Turn it R/L until the idle lowers. (slowly!) (only AFTER it has warmed up.
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