1983 Johnson 15 Hp

[SNOOK115]

Motor Starts Easily.. When Motor Warms Up, Will Not Run At A High Speed, Bogs Down, Will Only Run At A Idle Speed., Have Rebuilt Carb And Changed Fuel Line. Went Back Out And Tried It Again.... Motor Ran Great; Until It Warmed Up, Had Same Problem, Bogged Down And Ran It A Idle Speed To Get Back In. This Has Got Me Snookered....... Help:::::

 

[Joe Reeves]

Re: 1983 Johnson 15 Hp

It' possible that the engine is overheating to a point where it's starting to seize. S/plugs should be Champion QL77JC4 plugs gapped at .040 .

Check the continuity of the coils as follows.

(Magneto Capacitance Discharge Coils)
Check the continuity of the ignition coils. Remove the primary orange wire from whatever it's connected to. It may be connected to a powerpack screw type terminal, a rubber plug connector, or it may simply plug onto a small boss terminal of the coil itself.

Connect the black lead of a ohm meter to the spark plug boot terminal, then with the red ohm meter lead, touch the ground of the coil or the powerhead itself if the coil is still installed.

Then touch (still with the red lead) the orange wire if it's attached to the coil, or if it's not attached, touch the primary stud of the coil. You should get a reading on both touches (contacts). If not, check the spring terminal inside the rubber boots of the spark plug wire. Poor or no continuity of a coil is one reason for s/plug fouling.