2006 Rancher 350 slow turnover

Hello all!!!

New to forum, searched but couldnt find an answer to my question….

2006 Rancher 350….Just had a carb kit put on, and the mechanic adjusted the valves. It runs, but turns over very slow when starting….even with battery charger connected…and also put a new battery on it. Could valve adjustment cause my issue? Acts like a new car motor with higher compression when starting….

Thanks for any info!!!