I need some expert opionions. I have the Kawasaki FH680V-BS13 engine on a Wright Sentar. The motor is smoking white smoke, has oil leaking from the top of the motor under the fly wheel and the oil looks milky, like it has fuel in it. What do I need to do with this engine. It only has 500 hrs on it. Should I buy a replacement and if so, which one? I cannot find an exact motor with the BS13 in the code. Or should I have it rebuilt? Thanks in advance.