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I’m not much into Mercurys either, but fix a few for friends and neighbors, so maybe I can help some. Double-check that serial number, as the Merc serial numbers with a letter in them that I’ve seen all start with a zero “0”, so maybe that D is a zero. That would make it 0L266900, which, as a 9.9 2-stroke, puts it in the serial number range of the link below. Note that Mercury’s first 9.9 HP was, I think, 1986, and was a totally different (and in my opinion much better) motor than the 9.8 it replaced. I’ve only worked on one of these and that was a 1986.
Good Luck!
Dave
https://www.marineengine.com/parts/mercury-outboard-parts/99/0g760300-thru-0t979999-usa