Posts: 208
Location: Sun Prairie, WI | Thinking about upping the hp on my boat from a 75 to a 90. Same era motor. 2 stroke mariner. Getting a decent deal on the motor. What can I expect to see for performance gains. Should I start with the same prop as the 75? 17p aluminum. Also as long as the motor is off im thinkin about raising the motor 1 hole. Its about 1/2 inch above the bottom of the boat at the cavitaion plate. With the current setup im getting about 32mph at wot. still have alittle room to trim but starts to porpoise if i trim any higher. Boat is a 1988 yarcraft 1678 max hp is 90. any input would be great. thanks |
