Just got my new motor (Yamy F150) and mounted it on my newly redone 1974 20ft classic. Lookin for info on the right prop? At full throtle only gettin 5500 rpm and doin 35mph with to guys and a lite boat. Any body runnin a four stroke 150 or similar on a twenty foot seacraft? I am not a speed demon but I thought I maght be able to slide along at 3500-4000rpm atnear 30 mph but only doin 20 at 3500 and 25mph at 4000rpm. Thanks
Capt Russ
