"I have a 17'whaler with 1
"I have a 17'whaler with 1994 88 hp Johnson Spl. I can only get 4600 rpms and 35.8mph out of it with a 13x17 stainless steel prop.It seems most other whalers with this motor ( or 90 hp) are running the 17 inch pitch or even 19 inch pitch and getting 5300 or 5400 rpms at wot.I so far have motor cavatation plate raised 1 1/2 inches above bottom of boat, confirmed that throttle plates in carb are opening completly, motor otherwise starts and runs great.Also checked compression it is 106,106,110,115. Could my timing be off, would it still run good if it was? I bought boat last Oct. just now finished painting and fixing it up, I didn't run it prior to buying it. Thanks for any suggestions on why I can't get more rpms."
"I have a 17'whaler with 1994 88 hp Johnson Spl. I can only get 4600 rpms and 35.8mph out of it with a 13x17 stainless steel prop.It seems most other whalers with this motor ( or 90 hp) are running the 17 inch pitch or even 19 inch pitch and getting 5300 or 5400 rpms at wot.I so far have motor cavatation plate raised 1 1/2 inches above bottom of boat, confirmed that throttle plates in carb are opening completly, motor otherwise starts and runs great.Also checked compression it is 106,106,110,115. Could my timing be off, would it still run good if it was? I bought boat last Oct. just now finished painting and fixing it up, I didn't run it prior to buying it. Thanks for any suggestions on why I can't get more rpms."