I'm leaking fuel in the filter (? not sure what it is called) that is in middle of fuel line. I'm also leaking fuel like crazy around the carburetor and the black round piece that the throttle control line attaches to. I've attached pics. Also, after removing back tire to put on new sprocket assembly parts, the back tire is wobbly after I put it back on even though I have tightened the nuts as much as I was physically able to.