I have an 800 cvt (convertible) and a 800 plus, they are great machines. Currently setting up another 800cvt for a friend. The best thing I can advise is to get ahold of Jim at http://www.jimsearneye.com and order his pdf on how to adjust a PW 800. I think it cost $5 but it is the best $5 I have ever spent. He goes over adjustment of every stage on a PW 800. He approaches it from the stand point of you just got a used 800 from your buddy and it doesn't run right. He is also a good source for PW parts if PW is out of stock or really behind. You will love that machine!