One recommendation. Place the motor on the bench with a 15-8 for 30-45 minutes running time a full throttle. The first thing the YS sport motors need (the FZ series and any earlier non-DZ/L) is a good break-in. Do as the manual suggests, rich for a bit, and turn the needle in a few clicks each tank full. Starting at aroud two out and finish at about 1.5-1.25 out is in the ball park for this motor. 30 minutes on the bench will NOT fully break in the motor, but you will be way ahead of the game when you go to fly.

Here is the thing. YS have lots of power. Flying around at 1/4 throttle will cause the break-in period to last for 50 flights or more. Many YS sport motors will react poorly at times during that period and frustrate the user. The 30-45 minutes at full throttle on the ground will get the break-in well underway and save stress on the airplane. The mid-range response will change considerably in that time and when you mount and fly, the motor will be a jewel. After you intitial 30 minutes of high speed running, allow the motor to run at 1/4-1/3 throttle and listen. If it loads up, turn in the regulator about 1/4 turn. Try again. Still loads, another 1/4 turn in. Do this until you have reached one turn or the motor no longer loads up. If you have gone in one turn on the regulator and it still loads, run the motor another tank or two at full throttle. The break-in is most important in getting this critical transition phase evened out and it does even out.

Mark