I live on a homestead in NW. Michigan and I am rebuilding a 1999 Honda 300 Fourtrax 4wd that my son gave me. I have replaced the Carb and coil. A couple of weeks ago the thing quite running. I bought a new pulse generator and installed it but can't get the left hand case to go back on. I bought a Clymers manual for it and according to it it should just pop back on. It recommended not letting the gear shift shaft come out with the case removal but it did anyway. I can't see that would be a problem. Any suggestions?