I know there are tons of things about valves and changes/tuning ect. But i have searched the forums and was not succesful. I havnt been riding for the past 2 years and I need some help. I really dont want people posting saying "crf250r ROCKS!! they are awsome!" I have a few questions. 1. Can i get some feedback on how easy the valves are to adjust/tune? 2. can i get feedback on how easy crf250r's are to work on? 3. How often do you have to adjust the valves, does it vary with what year you get? ex. 04 every 15 hours, 06 every 45 hours. 4. What is the average cost the valves done at the shop, and how about replacing the valves, how much does that cost at the shop? 5. How many times can the valves be adjusted before they need to be replaced? My last bike was a yz85, sence then i have grown and now am 6 foot even. I know some of these questions have been awnsered, and i did read the valve stickey. I know how annoying it is on forums new members askign questions that have been asked 1000 times. Also, I need feedback on how often this bike breaks.because I will be doing the mataniece <sp? not my father. 2 Strokes are much easyer to work on. Also I have a few questions when looking for a used bike. 1. What should i look for that is wrong? stress marks on the frame? 2. What should i look for? 3. How can i tell how much life is left on the valves/engine?