Hi,
(short version) -- I recently (this week) upgraded to a 1996 175 HP Black Max from a 1984 150 Black Max. I put the propeller from the 150 on the 175. I rode it for the first time today and was generally disappointed. It would not go over about 4900 RPM and it did not "raise" the boat as much as the old 150. I noticed that this new motor did not trim as high as my old one. I will be talking with my mechanic tomorrow and at the moment I would like to believe the motor is operating fine and either it needs raised/lowered and/or I need a different prop. Before I talk with him I was hoping maybe to get some different thoughts.
I know enough to be dangerous; fishing a lot, but never really spending a great deal of time learning about performance considerations. I think motor height and the prop have something to do with this. The motor is on a 1983 18.5 foot Champion. With the old 150 I ran about a 5 foot rooster tail, 54-5500 RPM, and it lifted the front end nicely, I always felt the boat was riding somewhere right behind the seats.
Today it definitely ran "flatter" (the front end did not rise as much), it felt like the boat was riding a couple of feet in front of the seats, I didn't have any rooster tail (maybe a foot, if that --- the motor would trim any higher), and I couldn't get over 4900 RPM. One thing my mechanic said when I picked it up was that he thought my prop needed "cupped" and balanced.
Thanks in advance for any feedback and thoughts,
Jeff
(short version) -- I recently (this week) upgraded to a 1996 175 HP Black Max from a 1984 150 Black Max. I put the propeller from the 150 on the 175. I rode it for the first time today and was generally disappointed. It would not go over about 4900 RPM and it did not "raise" the boat as much as the old 150. I noticed that this new motor did not trim as high as my old one. I will be talking with my mechanic tomorrow and at the moment I would like to believe the motor is operating fine and either it needs raised/lowered and/or I need a different prop. Before I talk with him I was hoping maybe to get some different thoughts.
I know enough to be dangerous; fishing a lot, but never really spending a great deal of time learning about performance considerations. I think motor height and the prop have something to do with this. The motor is on a 1983 18.5 foot Champion. With the old 150 I ran about a 5 foot rooster tail, 54-5500 RPM, and it lifted the front end nicely, I always felt the boat was riding somewhere right behind the seats.
Today it definitely ran "flatter" (the front end did not rise as much), it felt like the boat was riding a couple of feet in front of the seats, I didn't have any rooster tail (maybe a foot, if that --- the motor would trim any higher), and I couldn't get over 4900 RPM. One thing my mechanic said when I picked it up was that he thought my prop needed "cupped" and balanced.
Thanks in advance for any feedback and thoughts,
Jeff
) Tha 2.5 175 should be like day and night compared to your little 2.0 150. Find someone in your area that has some knowledge on "how to" and what to" do on your set up. 