I purchased a 2004 Honda Rancher 2X4 manual shift Sunday. The motor was locked up and the crank case was filled with "Mystery Oil". I pulled the head and freed the piston from the cylinder. I removed the jug but could not get the wrist pin out of the piston (yes, I removed the keepers). The piston will not pivot on the rod. So I am going to do a complete rebuild. I have zero experience on this motor (my other ATV has over head cam) so I am looking for a shop manual. Does anyone know where I can get a good shop manual? Also has anyone had the piston wrist pin seize to the rod and if so what was the root cause?