Hey guys got a question i just bought a 07 yfz 450 and im going to jet it pipe it and air filter it, but ive been reading about jetting and it sounds like ppl are changing the jet for differnt elavations ? on my 300ex i had a jet kit and it was good from sea level up to 5,000 and i ride from on the beach to 5,000 ft all the time so i dont want to have to change it every time so is there a jet kit that i can get for sea leval to up to 5,000 ft, and i tried to ask this question at another forum which i thiought they would reply but no, hope you can help. THNX