Guys I just picked up 97 xr 400 at a cheap price. It was in storage for two years. It runs good but it smokes white smoke constantly. It is blowing oil out the exhaust as well. I checked the valves they are in spec. I changed the oil and only put in under 1.9 qts and checked the level and it's good. I cleaned the air filter thoroughly. The bike runs strong. I have not done a compression test but I know it's either the valve seals or the rings. What is your best guess? I have run the bike for a while in the woods and really ran it hard hoping the seals would swell or the rings would unstick if that were a problem. Let me know what you think. Smoking in Pittsburgh.