Bought a rancher 350 couple months ago that was sunk. Rebuilt with fresh top end rings, valve seals, gaskets hole ordeal. When i start up bike it still smokes a tad but when you rev it it smokes alot. Im thinking it could be oil in the muffler? If i take the muffler off it doesn’t smoke when idleing or when its reved up. So would it be possible for muffler to have alot of oil in it?