My guess is that is the auction engine, Congrats on the win. Here's my set-up, it's been posted before but here it is again, probably a good starting point. Small stock venturi, Big Art tube muffler, RSM 12x5.5 prop,Powermaster 10% R/C fuel w/ 1 ounce aero oil, Merlin 2005 plug. I also installed a ST-NV, probably not necessary but since I had one, went with it. Fuel is critical, it doesn't like a lot of castor. RSM 5.5 ounce uniflow tank (no muffler pressure).