Make sure you haven't over tightened it. Slowly rotate the rear wheel while checking the amount of slack on the top of the chain. It should have approx 30mm of movement at all times. If it goes really tight you'll be in for new bearings on the output shaft if you don't rectify that.
It's the chain as everyone has said
Zen wisdom: No matter what happens, somebody will find a way to take it too seriously. - obviously had KB in mind when he came up with that gem
Artificial intelligence is no match for natural stupidity
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