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I have a 1995 johnson 150 , carbed , with ops ignition that may not start at all or will just quit running down the lake . Some times but most of the time give a few min. It will fire up . I do know it loses spark on all plugs when this happens . Seems to be weak coming out of the hole with a full livewell . The boat is a 17.5 ft. Hydrasport . Boat sat for 2 years . Is there a fuel presure switch ? I have tested kill and ignition switch .
bump
When it dies does it gradually die or immediately shut down? If immed. its probably a electrical problem if slowly maybe fuel . When you go to start cold do you smell fuel or is there any in the water around the exhaust ? check fuel hose and bulb 1st.this new gas eats hose's and bulbs I'm told. Throw in some seafoam or startron from walmarts then change plugs AFTER you have ran it a little. I am definitley not a mechanic but this solved a problem similar on a friends boat. If its electrical maybe coils or ? can't help much
I suspect a bad ground wire.
It will shut down as if you pulled the kill switch . I here some clicks theN it will start .
would be better if it would just quit and not start back,the opticle eye is known to go out on those motors but with it doing that way your just lucky if you guess what part it is.very expensive swapping parts.shops have an ignition anylizer to work on them,brp shop manual for that motor would be a minimum to try and fix it.i would start chasing wires down and remove,clean grounds check for bad wires etc.could be losing power through the ignition switch,hook another control box to it if you can borrow one,i have one if your close to me.do you have a box or flush mount with the seperate key switch with the lanyard that you have to push down and snap on the switch?these are a pain,i switched mine to a seperate kill.since you say you're losing spark and it quits that quick i would doubt a fuel problem.i will be at rough river this next week not sure what days yet,tues for sure,if you want to try the control box.
Is it a extra pack ? I live on 259 s. 3 miles from harned . Scott stinnett 270-617-1010
Power pack .