I have a 1968 mercury 500 serial number 2408927 with a couple questions. First this myself a very little weight in the boat the motor tops out at 4200 RPM at around 20 MPH. the motor is on a 1968 Star craft Polaris 16 foot runabout. Everything i have read says the motor should run at WOT 5500-5700 is this correct? It seems the timing is fine and all four cylinders are firing. Compression on all four is between 135-138 pounds. Could it be the throttle cable needs adjusted? I did notice the lower unit prop shaft has a very slight bend to it but is not severe.
Any help is appreciated.
Thank you Nick