[krat]

You say you have not looked at it yet but you have decided what the problem is.

Better go outside and check out the problem before you decide on a cure. You don't know if you need a new clutch. You don't even know if you need a new chain.

Best to check and see if you have bits of chain jammed inside the sprocket cover stopping your engine rotation.

Sounds like a classic off road "stick between the chain and sprocket, twisted off the master link".

You might only need a new master link, which you can buy at any bike shop for a couple of dollars. You can also get a new chain without leaving town or shopping Amazon.

When you put it back together go to Youtube and watch a video on proper chain adjustment procedures. If you get it cocked up sideways it can be bad.