See full version: 1987 Merc 70/80/90hp variances
I am interested in this one and have talked the owner down to $1500, but try renegotiating for $1400 when I go and check it out. It looks absolutely fantastic for what it is, practically new. Good deal? Anything I should pay attention to or check when I go see it? He will start it up for me on muffs. more
I'm looking at purchasing a 1987-1990 Mercury 70 or 80 hp, these are the models where merc basically upped the displacement from 66.6 to 71.1 cu in and I was just looking through my manual and it shows the 70, 80 and 90hp models all are 71.1 cu in from 1987-1989, then in 1990-1992 they dropped the 70 and 80 and made 75 and 90hp models also at 71.1 cu in. What are the differences between these motors? Mainly I am looking at a 70 or 80hp to replace my 1978 merc 800 with power trim. I also want to know what the weight difference is (if any) compared to my current 800 with power trim? I believe my current motor is weighing in around 260 lbs but I'm not sure. And I read somewhere that these later 70 and 80 hp models weigh in at 265 lbs? Can anyone verify this for me PLEASE as I am already slightly over powered and don't want to add too much extra power/weight.
Carbs, reed valves and tuner pipe, same weight
Re: 1987+ Merc 70/80/90hp variances? more
Understanding this chart:
Example: Grn = Green Wht/Grn = White/Green Stripe
"Wire to wire" means take measurement between those colors of wires on the component
(a) Some units use White/Orange stripe to White/Yellow and White/Red to White/Green.
Light green columns are reference readings for measured ohms of the specified component
Light yellow columns are reference readings for measured DVA output of specified component
While it's possible a component can be within specs and still be faulty, any component found not to be within specs should be replaced. more
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CDI stators and switch boxes for Mercury/Mariner outboards and Sport Jets are covered for two years; triggers, coils, rectifiers, voltage regulators and harnesses are covered for one year. more
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