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You may want to check the dimensions of your current prop. I don't think anyone is making a 16.75 inch diameter prop for that engine. ( Not enough clearance for it to turn).

Yep its not my mistake, its the part number. The problem is the Quicksilver part number QS 48 1634 5A 17P does not compute, that is all thats on the prop, it may very well be the right one, if thats the case I need loads of practice triming this thing.

Don, is that a stainless prop?

Yep. Stainless

If you're not turning the 17 at least 5500 rpm, you sure don't need more pitch. I would suggest you get the motor checked, especially if an alarm was going off. If the motor is fine, play with the trim.

DS, First off congrats on the new ride. It looks great!

On the speed thing, I'd be surprised if you reach the Manufacturers speed. It's right in line with the posted draft, most measure it with little or nothing in the boat. maybe not even the motor. You mentioned there were two people in the boat...but what about fuel load, coolers, etc.
Those RPM's are low, so adjusting with the pitch will help some, but those last 500 or so RPM's aren't going to increase the speed that much.

2 people, 50 gals of fuel, nothing else, was a test run. It still needs to run @ 5600, even if its not 50mph.

OK the mystery is solved. Took a long time searching but the part number 48-16314A5 crossed over to an OEM 14 1/2 X 17 Stainless Michigan Wheel. Now I got to look at how high or low the motor is mounted, and guess play with trim a bunch more to get to the 5600 mark.

You're on the right track, Don. It amazes, and surprises me that very few boats are set up properly by the dealer. Boat/motor setup is critical for optimum preformance.

I just thought of this...It shouldn't make much, but it will make some...You are carrying around a big arse sail called a T top.....It is creating some drag that will decrease your speed......

Another thing you weren't checking speed while you were pulling someone around were you

dstockwell wrote:Now I got to look at how high or low the motor is mounted

Cavitation plate should be within 1 inch +/- the keel on most boats....Did you call Key Largo?

Yea I called. prop is right, I talked to the dealer, I betcha I am not even close to where it needs to be trimmed. I will check where the motor is mounted later, and if its right, then its the trim. Even if I do not hit 50 with the sail up there, I still should turn 5600.

I believe that the top speed by the prop selector is under ideal conditions. It stated that my boat should run 46.9, but the best it has ever done was 44 going with a good current. I agree with the t-top; it is like pushing a billboard sign.

Don, a good friend of mine just bought a 16 foot Key Largo with a 70 horse Merc on it. I fished close to him in my 18 foot boat most of the day the first time he carried it out. In two foot of water, his boat had a heck of a time getting up on plane. My boat draws 17 inches of water, and I could get on plane everytime he couldn't. He had to idle out of shallow water all day. The thing just would not get up on plane. He has not resolved the problem as yet.

Lower the trim to get up faster adding one of these also does wonders
STABILIZER PLATE #BT