if ur sellin it for 450 ill buy it , but i just rebuilt my bottom end, and starting would have nothing to do with that, if it goes in 6 gears then your bottom ends fine, the crank only goes in one way so u dont have to worry about that, did you check your reeds? dump some fuel in the sparkplug hole and see if it starts, did you drain all the gas out of your carb when ou took it off?