I just went and looked at a couple of my bikes. The Mikuni's mounting holes are spaced avout 2" apart and are horizonal across from each other. The 5 hp briggs I have has about 1.5" bolt spacing and are about 45 degrees. If the engine you have is like mine it wont just bolt up. The carb would be leaning way off to the side and the bolts don't line up. If you can find an adapter to fit the two together that would be the way to go. My Mikuni is on a clone motor and I would never go back to a stock type carb. It runs so much better and is easy to adjust. And it looks cool too.