60 hp Merc prop question

Don’t know how well you can see the pic, but here’s the deal: I’ve got the above mentioned motor on my Crestliner tiller ‘hawk. The prop looks kinda small to me, although it performs well. But I’ve got probably another 2″ radius that would allow me to add a bigger prop (diameter-wise). Let’s say I were to put a bigger prop on that had the same pitch. What would happen? Would the Merc not be able to turn it as well because it was bigger? Would my speed slow down? Those are really my only guesses at this point. Looking forward to hearing your input.

I have a 60hp 4s on a 16 foot lowe and used this site to select my prop size and pitch. Try it.

http://sites.mercurymarine.com/portal/page?_pageid=126,53050,126_53052&_dad=portal&_schema=PORTAL

If you have a tachometer then you can set up your motor for its’s best performance. Doing anything without a tach is just a guess. You need to know if your motor is running at it’s best rpm range, to low is not good for it and over reving will create a problem. The prop your are running now may not be the correct prop, but you won’t know unless you have a tach.

Thanks guys, and thanks for the link. My tach puts me well in range right now, but I was just kinda curious what I could do with a prop since I had another couple of inches of space. I know just because I have the space doesn’t mean I have to get a different prop, but I was more curious about the possibility of improving speed somehow. Thanks again, and I’ll go check that link when I get a few minutes.