Pull the generator cover off the engine.
If the noise is really bad it's quite likely that your crank has broken just behind the generator housing.
There seems to be a weak spot the that is made worse due to oil starvation if a bike has run on it's side for any length of time.
If that's the case then it's new engine time. You've probably only bent a few valves but the cost of another crank, shells, etc. mean it isn't really worth the cost of the repair.
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