May 23, 2013 · Hello all, 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...

Jun 11, 2012 · Hi guys i also have an mercury 70 hp 2 stroke 3 cylinder outboard and was looking for engine spec and any other information or maunals thanks

Jan 30, 2010 · Re: Mercury 70 hp outboard - stator question well looks like everyone is on track and im still catching up! trying to get out this week my new trigger failed (white wire wont produce spark) so replacing with an old one.

Sep 20, 2005 · Re: 1989 Mercury 70hp Reputation Are you sure you're talking about the right motor? Isn't the '89 one of the Big Three family that was rated 70, 80, and 90 HP??? <br /><br />The old 3-cyl Merc (650/700) that was basically 3/4 of an 850-4 was very highly-stressed and prone to burning up but I don't believe the Big-Inch version would be the same.

Aug 21, 2012 · Re: Mercury Force 70hp Won't turn over Very disappointed in the seller, he should have given you an on water demonstration and shown you how to start and operate the boat.

May 6, 2008 · Re: Mercury 700 3 cylinder 2 stroke 70hp I'm almost 100% sure you have the same motor as I do. Mine has been very reliable so far. I believe the year is 76-77, check on your lower end unit you'll find a sticker, if you can still read it the year will be on there. Good luck.

Nov 29, 2001 · Re: 1980 Mercury 70 hp i have a merc 70 also with some problems. if you decide to sell the motor let me know i might buy it. but do not give up the ship to fast the compression test will tell you a good bit about the motor.

Re: 1962 Mercury 700 70hp question (s) That's assuming you're using 1962 (straight 30wt auto) oil in it. <br /><br />If you are using a modern TCW-3 outboard oil the std 50-1 ratio is fine.

Feb 10, 2013 · Re: mercury 70hp timing? Following is a simple version of a link & sync for motors up to 1988 inline Mercs That was posted in the stickies on here from awhile back.

Dec 12, 2012 · Re: Mecury 70 HP timing The high speed timming is what the motor has to have for the motor to run correctly at all speeds. It can be set at cranking speed and needs to be checked at WOT on the water when everything is done. The link and sync of the motor should take care of all the timming at idle along with setting carbs till the motor is running. If you have it as stated then adjusting of ...