Just bought a very clean '01 yz426, still has original tires, very little boot rub marks, etc. and 100% stock. Only thing the previous owner did was regularly change oil/filter and clean air filter. Never adjusted or checked valves. I'm in the process of sorting through servicing suspension/seals, brakes, carb (did BK and jamesnow mod), oil, fluids, engine etc. since its been stored for a while. It starts and runs very well (despite cold weather in Michigan now), but can hear noises from valve train and chain, maybe that's normal? Topend looks OK from what I can see, intake valves are just at the lower limit of spec and ex valves are 0.18mm (spec per manual is 0.20-0.25mm). Since I'm going to be changing shims and will have cams off, I plan to do the "DCM" mod and new cam chain I read about here:thumbsup: Question is: I can't find a used 03-05 stock yz450 ex cam. I've skimmed the 36 pages on the DCM thread and can't find a definite answer from some one who has done just the hotcams ex cam with the stock in cam. I think it will be OK, anyone know for sure? Thanks.