Hi, I just went through this on a rev. in this case the tip on the plastic paw inside of the recoil wore off. I just replaced the paw, and it has been fine ever since. It was a fairly simple fix, and any ski doo dealer will normally have a few on hand. It is usually from the pawl not totally setting into the notch when starting. I have found that if you pull the engine through (pull it over slowly) a few times before starting it, they start much easier, and dont break the tip of the paw off as much. I have seen this a few times on ski doos, and they were all 800's
Ed