Are the 86 lt250r a good reliable quad or ids the motor just junk? the reason I ask is because I just rebuilt my wife's with fresh bore, wiseco piston kit and the thrust washer and bearing kit from the store here and it ran for about 10 seconds then quit.I pulled the cylinder and the rings were such in the grooves with the ring gap closed so it didn't have any compression.I have had more problems with this quad than any other one I've worked on.