I was just given a minibike and two briggs flathead motors. One motor is an IC industrial that says 5hp and has a dropped down large carb unfamiliar to me.I am used to the pulsajet carb on my gokart. The other has a pulsejet carb but is shorter and has the adjusting needle at the base of the carb and is different from the standard raptor type carb. Are these motors usable for the minibike and which would be better? Any thoughts would be appreciated.