I recently purchased a 2002 Pacesetter II with just over 2000 miles. I have never ridden a Whizzer before so I am completely in the dark with the operation of the motor bike. It's not presently running and on it's second WCI 008847 engine. I do have the original WCI engine 0004194. I'm confused with the different engine designations. How long should an engine last? Is there a resource to find some of these elementary explanations of the Whizzer and specifically the Pacemaker II ?