I have a 99 200 and still have the stock chain,the best I can figure is that my bike has about 3000 to 4000 miles on it.The chain is still in decent shape,I'm about half way through the snail adjuster,the only thing I have noticed is the countershaft sprocket is w'd pretty good but the rear is still in good shape.I'm a fairly agressive rider and ride alot of mud and hill climbs,streams ect....so I must be lucky with my chain,I do however clean the chain with a power washer after every ride and keep a light coat of WD40 on it between rides and it looks like it's still new.bottom line is keep care of your equipment and it will take care of you.