Confucius says;
he with the the biggest pile of scrap aluminum knows the most.
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Gordon Jennings two stroke tuning handbook is a pretty good place to start for info on porting. You'll have to keep in mind that a lot of what he is talking about is high rpm motorcycle engines with gear boxes so the power bands on those motors are peaky vs a outboard motor that needs a broader power band. But it has a lot of good info on 2 stroke porting.
Some reading for you:
http://www.vintagesleds.com/library/...20Handbook.pdf
http://iheartstella.com/resources/ma...nce-Tuning.pdf
Scroll the list for mods to Merc
http://www.boatsport.org/
http://www.ebay.com/itm/Mercury-Outb...28591a&vxp=mtr
Here is a good manual.
Alan
I slipped with my tool then had 8 ports to mirror.
Be very afraid.