I purchased a mount from ebay which drilled into the frame. No problem there. I have only ridden 5 miles at most and so far the front egine mount on the engine (near the exhaust) has come loose and the screw is missing which went into the engine to hold it on. What size screw is this and where can I get one. Also, has anyone else had this problem of the engine mount coming loose? Now my chain is hanging loose, should I pull the backwheel to make it tight after I reafix the engine?