my hisun 400 has ben leaking oil out of a small metal tube on the bottom near the oil filter. Got the side by side given to me after been sitting for a couple years but 2 quarts in nothing happened my buddy went and worked on it and put another quart in it. i thought it just pushed out what it didn't need. but its dry as a bone inside. does have a good clatter coming from the top end as well, with oil in it. looking for some help not much on the internet about these things.