Will this carb work?

it says below in the description that it's from a snowmobile ???
if that model ski is a 2 stroke, that carb will work, if you have the mods to support a 36mm, as in ............heavy porting and stroker crank, or ported bbk cylinder
IMO it's too big for anything less
 
I wouldn't touch that carb with a ten foot pole....find a Keihin. If you are looking for something for a lightly modded stock bore, try finding a PWK 28. If you are looking for something for a BBK, try finding a PJ34 or a PWK 35.
 
Yes, it will work. That big of a carb will require smaller jets than what you are running now, as I'm sure you know.

The biggest 'grey area' when installing an older Mikuni carb is which needle you're going to need. Since it came off a completely different application, you will have to swap the needle, and you may have to do a little trial-and-error experimenting to see which needle runs best with your setup.

There's nothing wrong with using a Mikuni carburetor. People are just afraid to tune them, since most everybody on here runs Keihin carbs. It is easier to tune and run a carb with which most of us are familiar. I agree, but a Mikuni will still work fine for you. I run a Mikuni TM carb on my Blaster, and the orange Blaster in my sig pic had a 30mm Mikuni round-slide off of a Polaris 250 2-stroke. It absolutely ripped with that carb, ported top end, and a 3mil Vito's crank.