So im planning to change my chain. I opened up my crank cover and found this. http://i40.tinypic.com/16iw3nm.jpg The small gear is sticking out as well as the screw. The end of the screw is kinda messed up but i think i can still use it. However i cant seem to push back the small gear to its original position. Its not loose and its very tight. I also noticed that the engine sprocket where you use the sparkplug to turn it is also loose. So i tightened that. Im still worried about the small gear being out of place. Any response would be appreciated.