rubberduck198

My 2000 wolverine runs fine on the flats but up hills(nothing monstrous)it has NO power even with momentum. Always end up in first crawling up.I pulled carb took to shop and had it rebuilt and set to factory specs,new clutch,tune up. There are no aftermarket parts everything is still stock.it's driving me crazy at this point not knowing what to do.besides taking it back and forth and still not right.