I know people that are on the stock bore from the mid-late 90's on their shee's. Other's I know blow them up it seems like a few times a year. Getting everything dialed in correctly and taking care of it I think is 90% of the deal. If you wanna go through alot of mud/swamp riding I definately would get something else, remember what this macine is capable of and never take it outside of its elements and you will be fine with regular care. Mine is more apart than together, not because it's unreliable, it's because I can't keep my hands off of it messing with stuff and adding aftermarket parts to it. It's like a drug, once you start you cant stop modding. Good luck with you decision.