Quote Originally Posted by Roflhat View Post
Alright, I've never tried shimming the gearbox but heard you can shim it tighter to gain some rpm. Not sure if there's much to be gained by balancing the gears seen as the diameter is relatively small but any gain is of course welcome
Did you do any back to back tests with the different gear oils? I looked into it a while back and it looked like Amsoil 75w90 or Castrol hypoy 80w90 looked like decent candidates
Shimming it looser, may increase your RPM til it blows up. Raise the motor 1" and get a new propeller. This will do more than all the blue printing a gearcase can ever gain. Get the gearcase out of the water. (Less drag)... Sharpen the skeg...