Does it have a briggs engine?I have what i think is a 650, the id plate is long gone. The bonded coupling has been bolted straight through, seems to work fine, i know this is not the right way but what are the potential problems? The right side wheel is sloppy appears to be the hub or wheel hub, any ideas on the problem? There is oil all over the left side wheel, any idea what this may be. I will work my way into these problems one at a time, just throwing it out to see if these are common problems and what the common fixes may be. Any insight will be appreciated. I also would like to nail down what model i have if anyone can help?