Reduced engine power after head replacement

History- 2005 RTV 900 1600 plus hrs. I've owned 5yrs. Lately I've noticed slight loss of coolant and discovered water pump leaking and small crack in head. Rtv ran fine with no loss of power or overheating. Replaced the water pump and a new complete head. Ran 30 min. let set over night retorqed the head and readjusted the valves on .006 ,flushed the cooling system, took th muffler off and cleaned it out, checked air filter.
Currently engine cranks and runs as it did previously but when you...

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Reduced engine power after head replacement