Welcome!!!
I am running a 1988 140 Johnson looper on my 20 Sceptre and after I redid carbs and waterpump it runs great...
ran a 135 on my 20 Seafari and a 125 on my 18 SF....all did fine.
140 plenty for your 18.
Check compression/carbs etc on the 1984 motor and you will be fine....easy to work on etc.
Also post pictures of your 18 !!
-Fred
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"...Southern by the grace of God"
Last edited by fdheld34; 04-04-2013 at 03:45 PM.
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