Mercury Horsepower within powerhead size

dhazlett · #1 May 15th, 2003, 05:58 AM

I've been told it is relatively easy to increase the hp of a Mercury 9.9 (1994 vintage) up to 15hp. I was wondering just how 'easy' it is or how much it would cost to have someone else do the work?

JerseyJim · #2 May 15th, 2003, 07:21 AM

you are correct on the powerhead sizes being the same. it is possible it is just a carb change - but it could also be other tuning like compression and timing.

dhazlett · #3 May 15th, 2003, 11:47 AM

Thanks for quick reply. I had occasion to stop by dealer this AM. Estimate was $150 for new carb & $50 labor. Not too shabby, when I was considering $2000 just to get to 18 hp!

FlyBoyMark · #4 May 15th, 2003, 01:19 PM

$2000.00 will buy a brand new Mercury 25 HP here...

dhazlett · #5 May 15th, 2003, 03:02 PM

Yes, I know, but I'm faced with a horsepower limit on my two favorite lakes; 18 hp on one and 10 hp on other. This upgrade is very common (I'm told) and is in widespread use on boh lakes.