I bought a motorized bike recently and its been great, my friends and i love to ride them around due to our town having a lot of bike lanes. I've run into a problem with my chain/sprocket. When i try to turn my pedals the wheels and chain refuse to make a full turn. I've read through some other posts and it seems like i might have a problem with the sprocket being loose or unaligned. Was looking for some advice on how i should troubleshoot , what tools i would need, etc. I know the man who sold me the bike can repair it, but I'd likek to try my hand at repairing this first, all help is greatly appreciated!!