1986 Evinrude losing power at full throttle

Slow1

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Apr 2, 2012
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5
I have a 1986 Evinrude 150 Ser.# 150STLCDC. I have a problem when I go from 3500 rpm to full throttle the motor cuts out like I have let off the accelerator. I have cleaned and rebuilt all three carburetors. I have cleaned all of the electrical connections. I have checked the compression on all six cylinders. I checked for spark and found today at low speed all cylinders have spark but when I go to WOT I lose spark on one bank. I have checked the fuel system completely by the advice of many other posts here, including hitting the choke and spraying fuel into the carburetors when it starts to cut out. Neither the choke or fuel helped. I saw large amounts of fuel entering the carburetors at full throttle. I believe that I have a power pack failing. I went to try and swap the power packs today at the lake but found out the prior owner had hard wired one to the motor making that not possible. I live 30 minutes from the nearest lake and have made countless trips trying to figure this out and any help would be greatly appreciated.
 

Slow1

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Apr 2, 2012
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Re: 1986 Evinrude losing power at full throttle

I really need somebodies help, PLEASE!
 

Lil' Johnson

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Jul 13, 2008
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36
Re: 1986 Evinrude losing power at full throttle

I would say you are barking up the right tree. What else besides a power pack would kill only one bank? Just to be thorough check the connections to the pack and especially the ground wire. If they are good, I would spend the money on a new power pack. Too bad one is hard wired because switching them would definitely tell you.
 

Slow1

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Apr 2, 2012
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Re: 1986 Evinrude losing power at full throttle

Thanks Lil' Johnson for replying. I have redone the ground and I guess I will be buying a power pack and a new wiring harness so if it fails again I will be able to swamp them out. Thanks again for replying!
 

Slow1

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Apr 2, 2012
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Re: 1986 Evinrude losing power at full throttle

Has gone from bad to worse. Replaced one bad coil on bank that had spark and one power pack on side with no spark and out over 200.00.
Now I have no spark anywhere. Any Ideas?
 
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