Alright here’s my story. My 08-450 stretched the stock chain just about to the max after about 10 hours....I took Grays advice and got myself a Regina o-ring chain...got the chain and took the old one off. My buddy brought the chain across the street to the speed shop to have the chain cut. The old wise man looked at the stock chain cut the new one to the stock length (114) one, and said good luck. Now being the same size as the stock chain, it has about half adjustment left....this means my sprockets have more wear on them than is good, or at least this is what I took out of the situation at hand. My questing is; would it be best for me to replace sprockets right now while the chain is still 100% or see how long the stockers will last?