Re: Adam from FlatRock, Mi.
To start with, when you pull the clutch lever can you then pedal the bike around almost normally? It should be a bit harder than it was without the engine, but not all that much.
If not, then you've got a clutch that's not dis-engaging. Or you've got a rear wheel that's bound up on something. Or maybe a drive chain that's bounding up under the clutch release mechanism.