2015 Massimo MSU 500 No power to start

[CDT540]

I recently purchased 2015 MSU 500 that had 800 miles and about 170 hours.  I have replaced the wet clutch, outer clutch and belt.  All the parts were from either Parts Boss or one of the other Hisun parts suppliers online.  It still has absolutely no power when trying to start moving.  If the ground is not perfectly level or down hill no way you can get moving in "H".  "L" and "R" is not much better.  As a utility vehicle it is useless.  No way you could ever pull anything since it can barely get itself moving.  Is this common?  I don't see how because it is barley functionable.  Any suggestions?  Does the quality of the belt vary from one belt maker to the other?  It appears that something is slipping, the RPMs climb but you don't go anywhere.  Trying to decide whether to just cut my losses and write off the $ I paid for it or give it one more try.  Any help is much appreciated.

 

Chris