Hello . I'm glad to have found this forum. I own a 1997 yamaha wolverine, I just rebuilt the top end, new wiseco piston first oversize, have the cylinder bored by a reputable shop, have the head checked and valves seal replaced. I installed the piston carefully, stagerred the rings per manual. I have about 4 hours of running time, and it still smoke, it has burned about 1/2 quart of oil. I used dino oil 10w40. What can be wrong?