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Discussion Starter #1
I HAVE A MERCURY 90 HP OUTBOARD 4 STROKE. IT STARTS GOOD COLD, RUNS GOOD. IF I STOP AFTER AWHILE IT WILL SHUT OFF WHEN GOING SLOW AND WON'T START UP.
IT WILL START UP AGAIN AFTER ABOUT 5 MINUTES.
 

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I had a 140 with a brainbox issue.
Cold it would start up no problem.
Hot it'd crank but not spark.
Tap the brainbox with the butt end of a screwdriver
it'd wake up and fire on the first crank.
Lived with the problem until I could afford a new controller.
Pop the cowling, rap the brainbox, start the outboard,
put the cowling back on and head to the next spot.
Lived with it for almost 6 months.
Not a cheap part.
 

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Discussion Starter #13
I had a 140 with a brainbox issue.
Cold it would start up no problem.
Hot it'd crank but not spark.
Tap the brainbox with the butt end of a screwdriver
it'd wake up and fire on the first crank.
Lived with the problem until I could afford a new controller.
Pop the cowling, rap the brainbox, start the outboard,
put the cowling back on and head to the next spot.
Lived with it for almost 6 months.
Not a cheap part.
thanks for the help, i'm not real good with the motor, where is the "brain box" ?
 

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Also known as the CDI unit
Check the Merc parts diagram for your outboard.
YouTube has some vids for checking the electrical system for function.
 
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Ha, I said heat soak... pretty sure it’s not the cap and rotor;)
Heat soak is basically where the fuel is boiled out of carb bowl or the vst tank. @Brett ‘s suggestion about the cdi/power pack/switch box is also a pretty solid area to be inspecting. Easy way to check for heat soak...
After shutting down, before you try to start just pump the primer until it is firm. Turn key on, wait 2-3 seconds and try to start. If it starts right up the it is probably a heat soak issue. If it still fails to fire right up then it is not.
 

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Discussion Starter #20
Ha, I said heat soak... pretty sure it’s not the cap and rotor;)
Heat soak is basically where the fuel is boiled out of carb bowl or the vst tank. @Brett ‘s suggestion about the cdi/power pack/switch box is also a pretty solid area to be inspecting. Easy way to check for heat soak...
After shutting down, before you try to start just pump the primer until it is firm. Turn key on, wait 2-3 seconds and try to start. If it starts right up the it is probably a heat soak issue. If it still fails to fire right up then it is not.
all right , thanks i'll give it a try
 
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