I am 35 years old and have just returned to the sport after being away for about 18 years (my last 2 bikes were CR125s). I just bought a used 2005 CRF450R with 42 hours on it. The bike is in great shape and the previous owner (40 year old getting out of the sport) seem very conscious about maintenance. Other than checking the valve clearances and other routine maintenance, I do not plan on doing anything with the top end, valves, springs, etc. (assuming the valve clearance are within spec). Does this appear to be a logical approach? Does anybody think that riding a full season and getting to around 80 hours or so (assuming the valve clearances or OK) is a bad idea? I would consider myself to be a novice rider which means I will likely be using a very small portion of the bikes power.