I have a Yamaha 60,4 stroke on my new Scout 160 C.C.
It came with an alum.12" prop.All the performance charts I veiwed prior to purchase have top speed on this set up at 38 mph/6100 rpm(tested with 13")
My boat tops out at 34 mph/6000 rpm.The motor is smoth up until full trottle,it then sounds...