Re: 90hp 1990force outboard best doit yourslf manual
Clymer is pretty good for most things.
It depends what you need to do.
Seloc has many errors in it, and does not give much "model specific" information.
You might get a factory manual from Mercury, don't know if they still have them. About $75 if they still carry them.
Otherwise, ebay, search for "force outboard manual" .
There is one on there right now, that ends this evening.
Item number 130077461416 , only $10 right now.
These typically go for $50 during the summer months, so you might get a real bargain now.