New Johnson 130 HP - Mid Range RPM Problem

[wothersr1]

130 HP JOhnson Motor was purchased new April 2002. Model # is J130PLSS and has 40 hrs running so far.<br /><br />Motor will not hold the RPM between 3100 & 3900 RPM. Push the throttle 1 notch up from 3100 and motor automatically goes to 3900 RPM. Push 1 notch down from 3900 and back to 3100. Speed difference is 23mph to 29mph. Motor operates properly at all other RPMS.<br /><br />Additional information. The prop is an SST 14.75 X 21. The motor is mounted on the bottom hole ie as high as it can go. Top RPM is 5,500 at 47 mph. Boat is a Doral Spirit, 17'4" and weighs approx 1,100 lbs.<br /><br />Thanks to All

 

[clanton]

Re: New Johnson 130 HP - Mid Range RPM Problem

What kind of throttle control do you have that has notches, throttle should be smooth from idle to full throttle. Very small movement of throttle for 800 rpms increase.

 

[wothersr1]

Re: New Johnson 130 HP - Mid Range RPM Problem

Thanks for your help Clanton. I used "notch" in a figurative sense. The throttle is stabilized at 3100 rpm. As soon as I move the throttle forward for a fractional increase in gas the motor accelerates and until it hits 3900 rpm and then stabilizes. If I throttle back a fraction, the decelerates until 3100 rpm and then stabilizes.<br /><br />Thanks for your help Clanton