No power when in the water when put under power but out of water with the flush system with the hose starts right away and loads up,perfect no issues
Sounds to me you have a bad cyl or a dead hole run comp. test on it see what it reads each hole should be no more than 5 to 10 lbs different if you find one that's way lower then the rest there is ya problem
SOURCE: Free wiring diagram for 1978 Mercury Outboard 115 HP boat motor
I have a maintainance manual for this engine (I have the same one) with pages of wiring diagrams. What specific system/area are you interested in, I could scan in the page(s) and email them to you.
Mark
SOURCE: I have a 1990 90 HP mercury outboard. It is rough idling and surg
I have a 90 hp force ob. when i run it with the ears she runs fine lets me bring the throttle all the way up. when i but it in the water thru the wake area i can do 4 mph once i'am out of the wake area and give it the gas she dies, any ideas
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