Engine died down at high RPM.

[steplift20]

lets not go crazy thinking the worst
it sounds like a fuel problem to me
do you have a fuel/water sepperator?
if you do change it also check the vent line on the outside of the hull make sure its clean and open
could also be an electric problem
stator/switchbox
oh wait i just remembered the switch box operates half of the plugs so went it cuts off it will shut them down causing half to get wet
while its running bad be careful and pull 1 wire off hold it to the block and see if your getting spark then the other side if no spark the switch box is the culprit
you didnt say what kind of engine you have
i had the same problem with my merc but it was sounding the oil alarm it depends on what switch box is bad it would run great then throttle would cut to half speed with the oil alarm going off

[steplift20]

a 150 evenrude i should have read to the bottom sorry but it can still be the same problem let us know there easy to change on a merc

[mushman]

Thank guys, It's a 1986 150hp 6 cyl Evinrude.I'd be happy with either the power pack (power pack looks to be just under 100)or switch(havn't looked that one up yet).
When I had the engine running at idle back at port I pulled each wire and I could hear the spark clicking and feel the engine bog.It would right itself once I plugged it back in.
I never held it to the block though.
Steplift, are you saying do them one at a time, disconnect then reconnect and move on, or disconnect one side leave it off then disconnect the other side?.
Thanks again guys.

[macojoe]

I did the same now that I remember, while running pull the wire off one plug, then again on the other side, one side makes no difference then thats the bad side. and means the switch.
I did that to find out why my motor was not shutting down after I shut it off, the yellow & Black wire on the left side was not connected, I found the break and all was well again