Jim, the Saitos come from the factory with very rich needle settings. They recommend using the glow igniter hooked up and running the engine at no more that 4000 rpm for the first few minutes of break in time. If you have 4 tanks of fuel through the engine then you are ready to set the needles and start flying to finish the break in process. Go to full throttle setting and lean the high speed needle until the rpm peaks, it helps to have a tach for this. After the peak is reached then back the needle off 200-300 rpm and that is a good setting. Now go to the low speed needle and start leaning it out until you get a good transition from low throttle to high throttle. You want the low speed needle as lean as you can set it but still get a good transition, then go fly the thing and after a few flights you will likely be able to lean the high speed needle a bit more and maybe the low speed too if the transition gets a bit slow. Saitos are great engines!