it sounds like as Jack said , you have reversed the clutches they are left and right , the cog looking parts inside rear wheels it IS easily done as they look almost the same , try just swapping side to side complete . means clutch , key ,washer and all related parts .. meaning all the parts you see when you remove the wheels try to keep them matched up if you did already .
its the only thing i can think of right now as its an easy mistake to make .
hope it works out for you
, Dave
