RE: Rossi engine
Airraptor,
Attached is a picture taken on Wednesday afternoon with the temperatore in the low 80's. Fuel was Omega FAI, APC 11x7, 10mm Carb. Sometime, as in the picture in post #4, the peak varies. Don't know why; phases of the moon, humidity, new haircut, etc. I have two of these engines. 24.4mm stroke, 22.7mm bore measured. The Jett Stream is theJS-90 version with 42mm spacing requiring no engine adaptor for the Rossi.
Danny