I just rebuild the top end of my 2000 honda rancher 350 es 2wd I had it bored with wiseco piston and ring cause it broke the skirt off the original piston since the rebuilt it has not been rode hard it’s been cruised around on trials and I did run it hard for about 50 yards after the first 3 hrs or so of running. I think I did break in right I started it let it get warm let it cool a couple time rode it for 15 20 mins let it cool and so on now after 115 hrs have been put on the rebuilt it started smoking. When it started it parked it and let it sit for a few weeks till I got time to tear it back down. I started it to load it on the trailer is smoked really bad I torn it down found oil sitting on the piston. The rings r still free not broken the ring gaps r in the right spot and the intake valve is clean of carbon build up does have oil on it but the exhaust valve is covered in carbon and oil top if the piston was clean too other than oil where is the oil getting it to the cylinder from. Sorry about the long post but I need help lol