Re: Mercury 8hp 2 strk altitude setting
The Merc charts call for 90-13449--1 as the service manual for your engine for s/ns (U) 0A197112 thru 0D280999. This manual is not available online.
However, 90-827242R02 / February 2003 6/8/8 Sailmate/9.9/9.9 Sailpower/XR10/Magnum 10/10 Marathon/ 10 Sea Pro/15 (U) 0A197112 and Above
(B) 09503295 and Above is the next manual and it says it is applicable to your s/n as well but the book itself does not agree with that.
So, here is a copy of the 90-827242R02:
http://1manual.com/Mercury manuals/Service Manual PDFs/TwoStroke/827242r1/cover.pdf
See Section 3A Fuel Delivery System and you will see the various carbs and their jet sizes for altitude as well as a chart for jet size cross reference to P/Ns.
Here is the parts listing for your engine which is a model:
1008201MD MERCURY 1992 8
http://www.crowleymarine.com/mercury-outboard/496.cfm
You can determine which carb you have on your engine and see what jet sizes you require for the higher altitudes.
Gerry