Question have a 225 HPDI wanted to
change lower unit oil pulled the plug and nothing but water came out very little oil. I know I need to put new seals in the lower now! Question my motor hasn’t been turning the rpms it should and I’m sure it’s not a power head issue or prop issue. Could the lower unit cause the power loss due to friction in the gear case. It would only turn 5500 rpm with a 25p prop on a 20ft boat.