[spareparts]

the specs i wrote came right out of the Mercury manual for 99. i have never swaped carbs around other than swapping complete sets, like i said, it would take a dyno and a lot of time and money to figure it all out, looks like the guys at scream and fly have spent the time and money( cool site).

I keep coming up with more ideas as the day goes on, does your boat have trim tabs? If so are they mounted flush with the bottom. Years ago I had a customer with a 60 mph boat that wanted tabs put on it, i installed the tabs per the instructions, mounted flush with the botom, with the trailing edge 1" up in the full retracted position, he lost 6 mph. Not the first time someone spent money and slowed down. I had to repair the holes for the tabs and cylinders, move everything up 3/4 inch, remount it. He picked his 6 mph back up, and got the chine walk under controll. The tabs mounted flush efective increased the wetted surface, without a clean break at the transom, it actually sucked the back of the boat down( you would think it would lift the bow).