I BOUGHT THIS WEST BEND POWER BEE 580 MOTOR FROM THE FELLOW FRANK IN OHIO WHO REBUILDS AND SELLS A LOT OF THESE ON EBAY. I PLANNED ON RESTOREING A 1960 SCORPION GO KART BUT JUST DON'T HAVE THE TIME. THIS MOTOR WAS TOTALLY REBUILT WITH A 3/4 INCH CRANK SHAFT. I BOUGHT A BRAND NEW HILLARD INFERNO FLAME CLUTCH 3/4 #35 ($100) THAT WILL COME WITH IT. IT ALSO COMES WITH THE CORRECT MOUNTING PLATE ($90). I SEE ABSOLUTLY NO RESON THIS MOTOR WON'T FIRE UP AND RUN PERFECT BUT JUST BECAUSE IT HAS NEVER BEEN STARTED AFTER THE REBUILD IT IS AS IS. THE PICTURES SPEAK FOR THEM SELF.