Posted by 44thomas44 on 10/10/17 - 7:08 AM
#4
I have a 1970 Katama 17 with powertech 13.25 x 14 on a brand new 70 hp Yamaha 4 stroke . I also have a 1988 Custom 17 with a Yamaha 90 hp 2 stroke . The 70 hp 4s performs almost identically as the 90 hp 2 s. Hole shot very close , but from 5000 to 6100 rpms , the 70 hits a passing gear and really takes off . The only real difference I see between the 2 engines is the 4 stroke gets incredible fuel economy .