oldfarmall
Seaman
- Joined
- Jun 18, 2009
- Messages
- 63
Hello-
Can anyone tell me an aproximate speed I should be reaching at wide open throttle with a 1964 Johnson 18hp? I am running it on a 1960 starcraft 14' v-hull aluminum boat. Had it out on the lake today with me and a buddy. Our GPS said 13-13.5 mph and WOT. Tried adjusting tilt of motor, didn't make much of a difference. I have replaced points, coils, plug wires, plugs. I rebuilt carb last year, soaked, blew out with compreesed air. I drain float bowl at end of season also. Compression is over 100 on both cyclinders. I am running 50:1 oil mix fresh gas today. The prop on the motor is a 9X10, part# 592959. PArts book says it should be 9.25X11. Would this make a difference? Took motor cover off and had my buddy at WOT pull link from cam to make sure carb butterfly was open all the way, no change in motor speed when he did this, so carb open completely. I am kind of lost, seems like boat should go faster than 13 MPH. Any thought would be great. Thanks!
Jesse
Can anyone tell me an aproximate speed I should be reaching at wide open throttle with a 1964 Johnson 18hp? I am running it on a 1960 starcraft 14' v-hull aluminum boat. Had it out on the lake today with me and a buddy. Our GPS said 13-13.5 mph and WOT. Tried adjusting tilt of motor, didn't make much of a difference. I have replaced points, coils, plug wires, plugs. I rebuilt carb last year, soaked, blew out with compreesed air. I drain float bowl at end of season also. Compression is over 100 on both cyclinders. I am running 50:1 oil mix fresh gas today. The prop on the motor is a 9X10, part# 592959. PArts book says it should be 9.25X11. Would this make a difference? Took motor cover off and had my buddy at WOT pull link from cam to make sure carb butterfly was open all the way, no change in motor speed when he did this, so carb open completely. I am kind of lost, seems like boat should go faster than 13 MPH. Any thought would be great. Thanks!
Jesse