I agree with RaceCity and disagree with Dave (only about the nitro content- Sorry, Dave!)

My Saito 82 idles reliably @ 1900 RPM all day on Wildcat Jet A (10% nitro, 23% synth/castor blend). When warmed up, I can idle this motor for 2+ minutes, and it will still "snap to" when I hit the throttle, even agressively!

I'm swinging an APC 13x4W prop.

I'm using the Saito "SS" plug that came with the engine.

I actually get compliments on how nicely this motor runs.

This should show you that the fuel that you choose (although it should definitely be of high quality ) is actually not the primary factor in the performance of your engine. True, higher nitro content will give you a smoother, more reliable idle... and for inverted applications, you could benefit from onboard glow... but tuning is most important. Get with someone who really knows what they're doing, and you will be pleasantly surprised. [8D]

Just a side note- don't expect the motor to be fully tunable until it is completely broken in. And check your valve lash as per the manual. And troll the engine forums here, they are full of good info. Good luck!