ok, clean it up really good. Make sure the the air filter isn't dirty, make sure there is no water in the diffs and i mean clean that thing up to were you can literally eat off it. If you have a new oil filter put it in there, make sure there is fresh oil in it. Make sure there is nothing like dirt or water in the gas take it to the honda shop and tell them you were out just buzzin down the road about third gear and the person you were ridin with noticed smoke was startin to come out the exhaust, and by the time you got it back to the house it was smokin like a train. Tell them you just changed the oil in it and everything was fine, as far as you new. That way when they check for a backwards filter or a broken filter they won't find one and they won't see any signs of abuse. Thats what i would do