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  Plugs and Prop for 1988 Johnson 90 on a 16'

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Author Topic:   Plugs and Prop for 1988 Johnson 90 on a 16'
tlynch posted 11-14-2003 05:17 PM ET (US)   Profile for tlynch   Send Email to tlynch  

I am asking this question for a friend who recently purchased a used 1988 Johnson 90hp for his 196? 16' Whaler.

For this engine would you go with NGK's or Champions?

I have read the threads and have found that a SS 13x19 Prop is a pretty standard setup for his combo. Do you agree that this should be the starting point? If he uses his boat for water sports should he get a 13x17 and then cup it if he over revs?

We should mount the engine at least one hole up - right?

Max RPMS for this engine is 5500 - right?

Our target performance with 2 people should be low 40's WOT and great hole shot - right?

Just making sure that I gathered my info correctly. Any advice is greatly appreciated.


Bigshot posted 11-17-2003 11:43 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
I would do a 17" SST and cup if necessary 5500 redline. Low 40's is right. Run Champion L77JC4's or equivalent.
Steve Leone posted 11-20-2003 02:27 AM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
I agree with big. Run the 17 and keep an eye on the tach. This should be done with just you in the boat with a normal operating load. wot should be 5200-5500 rpm. Champion for O.M.C, NGK for Merc.
whalersman posted 11-21-2003 09:40 PM ET (US)     Profile for whalersman  Send Email to whalersman     
If you are running any kind of electronics, I would also suggest the "Q" in the champion spark plug...


This is what my Evinrude dealer recommends and I have been using them for longer then I can remember... I use them on a 1985 70hp Evinrude, a 1985 150hp Evinrude and a 1988 8hp Evinrude...

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