2013 Polaris 500 Sportsman clutch help!!!

Hey guys and gals,
I recently told my uncle Id help repair his bike after what seems like a problem that occurred from a previous visit to the dealer. Long story short after getting his bike back from the dealer and drive it several kilometers he noticed and knocking pinging sound he returned the bike to the dealer to find his primary clutch smashed up fairly decent sheeves and spider heavily damaged. They told him a rock got through the air duct and done all the damage even though there are perfectly round indentations all over the clutch. Anyways I ordered a new clutch and transferred the weights and spring to the new clutch installed the clutch and the same belt and the secondary clutch. Now the bike is moving forward in gear when started or stalls trying to put it in gear. The secondary had 3 shims inside when he dropped it off, they were left on the shaft. I’m curious if someone could help me out here with an idea. Believe it or not this bike has only 108 Kms on the odometer. Thanks for any help you could give me guys.