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Author	Topic:   Johnson 90 hp outboard engines
mabarrow	posted 07-28-2006 09:36 AM ET (US)         I have a 1982 Johnson 90 hp outboard with a bad powerhead. What series of year powerheads is compatable with my powerhead? A friend has a 1969 Evenrude 85 hp with very low hours he could supply me. Will this powerhead work on my engine? Thanks in advance for your help.
BOB KEMMLER JR	posted 07-28-2006 10:50 AM ET (US)          I think any of the 85/88/90/100/115 V4 powerheads should work,but make sure the ignition sytems and carbs can be swapped between years.
mabarrow	posted 07-28-2006 11:29 AM ET (US)             Thanks Bob, I was thinking the same thing, however I just wanted to make sure. Thanks again, Mike
The Judge	posted 07-28-2006 01:09 PM ET (US)             Before you get into it...look at the base gaskets for both engines and make sure they are the same. These are the gaskets used to mount the head to the mid section. If they are not identical...no fit!
Whaler_bob	posted 07-28-2006 02:10 PM ET (US)          Even if the base gasket was the same (which they are not), you'd have to use the powerhead intact with 1960's electronics and fuel systems. The mounting holes/locations are totally from 1969 to 1982 for the carbs, stator, timing base, powerpack, coils, diode, wire harness, shift linkage, control cables, etc- so you'd be stuck with all the old parts and their problems. Better off getting something much closer to your old block. And, a 37 year old engine may not have a lot more to give.
Whaler_bob	posted 07-28-2006 02:15 PM ET (US)          Oops.... Meant to say: The mounting holes/locations are totally DIFFERENT from 1969 to 1982 for the carbs, stator, timing base, powerpack, coils, diode, wire harness, shift linkage, control cables, etc- so you'd be stuck with all the old parts and their 1960's problems.
mabarrow	posted 07-28-2006 02:45 PM ET (US)             I cannot thank you enough for sharing your knowledge on these engines with me. Your advice is well taken on obtaining a more recent engine to work with. If I can convince my wife, I will buy a new engine and be done with it. Thanks and have a good weekend, Mike
Teak Oil	posted 07-28-2006 08:25 PM ET (US)             These engine blocks are everywhere, no need to get a '69. I would not use your old carbs, a lean condition could be what killed your old engine

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