Recent content by 88xr4merc

  1. 8

    lower units

    I have an 88 xr4 blackmax 150 the lower unit gear ratio is 1.78 can I put a 1.87 gear ratio on it or will it mess up my motor
  2. 8

    prop pitch

    If I change my xr4 150 lower unit to a 2 to 1 gear ratio what prop pitch do I need to maintain 5700 rpm
See more
Top