With your pumped engine:

1) The high speed needle must be set as lean possible without detonation or RPM drop, and left there. DO NOT lean to peak and then richen a bit.

2) Set the idle only after the full-throttle mixture has been found. Set it wherever you have to set it to get a good idle.

3) Acceleration mixture is adjusted with the idle mixture. You may have to alter your idle RPM to help get a good acceleration.

4) Please be aware that your engine will need a few gallons' worth of running before it starts to really "come in".

5) Cooling is very important! A closely-cowled engine will need some cooling air over the crankcase, especially towards the rear. If it's not cooled well, the pump can get warm enough to encourage fuel vaporization in the pump.