A small turn of the Pump lean 1/8th (OUT) can help to smooth the idle. You don't want it to idle really low when you first start it up. It will be cold and can beat and bang around. Once it gets to operating temp up in the air it smooths out and the idle speeds up slightly....

I set my idle on the ground just on the verge of quiting...In fact it is so low that if let to idle at that rpm it will die....Once you make a procedure turn and then another turn at the end of the box it will be up to operating temp and will be just fine.

In fact when it comes to landing I will decrease my idle about a click or two when I'm on final. This is the sign the idle is a little rich....As the motor heats up it will lean out. So you want the idle to be a little on the rough side at the 2000rpm idle. It will smooth out when the temps increase.

If you have it too lean on the ground...It will go lean in the transition and bark a little as you throttle up fast. Another sign is while you are pulling the power for a downline or back into an idle the motor will not drop right into the low idle...it will be say 2800 and then start slowing down from there to you low idle...This is not good as the downlines get fast....Richer is better. Another lean sign is it surges at idle....

You don't want to beat the plane up either...so just give a couple clicks of throttle stick until is smooths out. When you come back to absolute idle in the air it will be perfect.

This takes a little time...as the engine breaks in the rich setting at idle will eventually go too rich as the motor is breaking in and not making the heat like it was the first 3-5 flights....So the setting will change a little until you get about 20-30 flights on the motor. A common thing on a new motor is about flight 5-6 the motor will be too rich and will die at idle entering a spin or on a stall turn....Usually a couple clicks leaner on the HS needle will solve it or in the extremely rich case and rougher idle case an 1/8th or so on the pump....remember this is a pump and not a regulator like pressurized YS engines. OUT is lean...Once you adjust the pump leaner you will need to open the HS a little to now accommodate the new pump pressure. So reset the top end..HIGHER pressure(richer pump) means close the needle more to get the right flow for HS mixture. Lower pressure means open the HS needle to get the right flow for HS mixture.

Enjoy

Troy Newman