2011 900 xp jumped time and I went to my local polaris dealear here to buy a tensioner because there is slack on the chain. The guy tells me it is recommended to change the timinig chain at around 200hrs. That seems way to early to be changing a timing chain. He also said their is/was a problem with the 900/1000 timing chains stretching. Anyone here able to confirm or deny the need to replace the chain every 200hrs? And now i don't know if I need to buy both a chain and a tensioner.