jasonevans-Well, kinda yes, and kinda no. My experience with my old 8hp kicker was somewhat weather dependent. If I was on a big lake and it wasn't blowin' to bad, no problem. About the same on a large bay depending on wind and tidal flow. On rivers, downstream certainly no problem but going upstream against a strong current....pretty iffy.
Depending how old and what shape your 9.9hp is in, you might want to give it a try first, it might be just fine. Another option would be to get a high-thrust model with that big prop.
Dan and Jan on Flat Iron