How fast can a 6hp briggs and stratton engine go when on a go kart ? (came off a power washer)?

May be...

If your keeping the same gearing and wheels etc, and as long as the new engine is not much heavier than the old one it should give you an improvement in top speed and acceleration, it wont be a huge improvement, but any improvement is good, right?

i just ordered a 6hp briggs and stratton engine offline it is used and was taken off a power washer just wanted to know if it is possible to put it on my go kart (it is a horizontal shaft )
how fast can it go when it is put on my go kart
i weigh 250 pounds and wanted to know how fast will my kart be taking me
i have a 5hp on it right now will it go 5-10 miles faster or just accelarate faster?broken tibula and fibula