Ok ive been reading some past posts on here and found some good info but still had a few questions. I think its time for a valve job and here is what ive been thinking 04 CRF 250R... Ti vs SS im leaning Ti but not sure. I read about the SS causing more wear on the head and having to replace the head eventually that doesnt sound fun to me. Also i read about the Ti reving easier and less weight ect. I plan to replace the springs, locks, reatiners, seals, valves, and have the seats cut. While im there thinking of putting a new piston, rings, and gaskets. OEM piston or something like a weisco? Is a high compression piston really worth it? I usually just do practice days at the track and some trail/dune riding. Is there anything else i should replace while im in there? cam chain etc? I have a friend that can help with the wrenching and i got a place to cut the seats but were are some good places to get parts besides the TT store? After the valve job how long typically does it last untill i have to start shimming again? Ive read basically by the 3rd shim its not worth shimming anymore. Do the valve coatings only start to go once the clearance zeros out? After a valve job how often should i check the valve clearance? 10 hrs? If I catch the valves before they go to zero and shim them does the 3 time shim guideline still hold? Last question off subject anyone know a good starting point for the carb? It has a yosh pipe (there website didnt have any specs) other then that stock? Ride in michigan i think 600-1800 ft but could be wrong on that part.