if you can post a pic of the derailluer with the chain on the small cog and small chainwheel. that will greatly aid in diagnosing if the chain is routed correctly and if it is too long
OH did you remove the pulleys? you may have reassembled the 'bearings' incorrectly.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk