Re: 90 Mariner Outboard Motor I would suggest buying one of the ubiquitous manuals on Ebay Motors. The one I bought should will likely cover yours; don't know about the year...........
The title of the auction was : Mercury - Mariner Outboard Repair Manual 1990-2002.
A couple of things. The above auction was for a Mercury Manual, not one of the "Chilton types" such as SEALOC.
Second, I actually had to buy two, as the first seller misrepresented the years covered. Fortunately it covered my Nephews engine, so I gave it to him. Both of these were about $10 including shipping.
There are tons of Auctions, just use the usual ebay common sense.
If you need more direction, just reply to this thread..............
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