im 5ft 10in and weigh like 130 and i have a 1988 kawasaki kx500 . i recently blew my connecting rod causing the piston to explode and send metal into the lower end tearing it apart. i want to put a new motor on it but kx500's are hard to come by. what kind of motor can i slap on it, it can be a lower cc or from a different brand any imput greatly appreciated.