JUST FINISHED CONVERTING A POULAN 69 cc ENGINE AND AM SPINNING A 20X10 PROP AT 10600 RPM IS THIS TO HIGH.WHAT IS THE BEST RPM TO PROP FOR?IT SEEMS MOST ARE RUNNING THERE ENGINES 7 TO 8K.IS THIS THE BEST RANGE FOR ENGINE LIFE?
I DONT WONT TO BLOW UP THIS ENGINE BUT IT REALY STARTS TO PULL AT 9K PLUS.
WHAT DROP IN RPM IS NORMAL PER EACH ONE INCH INCREASE IN DIA?I AM ORDERING A 22X10 TO SEE HOW IT WILL TURN.
THANKS FOR YOUR INPUT