mmmm so there is no drive to the rer wheel or is it just not revving out enough to turn it miggie?i would suggest taking the cover bolts out and just leaving two in each end then start the engine and then crefully take the last two out while its running then you can see whats going on there,dont run it wih the clutch bell off with the clutch shoes still on or it willl open the springs up and ruin them.but you could also try to turn the clutch bell with you hand without the engine running and see if its free or stiff.
adam bike doctor, April 2010