well by the looks of you pic your playing in deep mud . what kind of driving conditions , speeds is it blowing ?
check out my post of '' WEEKEND CARANGE" it talks about when i blew 2 belts in 3 miles !!!
what i found after talking with a bunch of the guys on here and tearing my clutches apart is that the secondary helix and spring are binding , the spring binds up when you get up to higher speeds causing the clutch to stick in that position . then the front clutch changes size , this causes the belt to gain slack in it . with out the load of the belt , the clutches then free up . the belt has tried to drive off of the clutches and it causes the belt to explode!
the fix for this is to has a little machining done to the inside of spring housing to prvent the coils from contacting and binding . ive seen a video of the belt exploding on a machine up on jackstands ! and it is violent !but i cant for th elife of me remember where...... one of the other utv forums they all experince the same problem . and they say weight of the machine and type of terrian ie mud or sand makes the problem worse .
another thing to check is to make sure you replaced with the correct belt . some of the aftermarket belt suppliers say that all the belts are the same size for all AC models , but the xtz has a longer belt but only by a few mm . ,
hope this helps a lil