1990 johnson 120

[eric1980]

I have an 1990 Ranger 370v bass boat 18ft with a johnson 120 what rpms should boat run and what pitch prop should I run. I also took the oil injection pump off and put a electric fuel pump on it that comes on when key is on but now have a problem with motor loading up at idle but runs fine going across lake. Any suggestion would be great...Thanks

M-j120tlasb
S-g2495140
120 hp Johnson outboard<br /><br />
Modified by eric1980 at 5:23 PM 7/2/2011


Modified by eric1980 at 5:34 PM 7/2/2011

[SEAHORSE]

get rid of the electric pump, those can give problems plus be very dangerous. You can always use your old pump as a fuel pump and just block off the oil pump part of it.

[mtbdsavage]

rpm range is 5000-6000...I'd prop it to turn 5300-5700