ok called to get the valve adjustment cost bout 90 bucks. but i want to upgrage from all this stock crap. what kind of upgrades should i start with? i dont know too much on this stuff, so if u list something kinda tell me how it would help. i do know i want an upgrade on the air filter and a full exaust, i've herd good things about barker i like the parts for atv price for 479, but is it as easy as geting it and just having someone put it on, or am i missing something that i will need to buy with it?