i just put my o3 crf450 back togother. i installed the athena 488 kit, and also had vance & hines hear in INDY do there top of the line head work. which included kibblewhite black diamond stainless valves,there racing valve spring kit,a hot cams stage 2 cam, a full race team spec, port & valve job, welding on exhaust ports ,epoxy in the intakes, t his thing should rock!!! my question is where to start on the jeting? im at apr. 800 feet hear in indy. should i just start with factory jeting and see how it runs. also has anyone tryed the cam 2 racing gas? i can get it hear close to my house for 3.49 gal. it has lead in it. could help with valve life? this is not much more the top line pump gas hear apr. 2.39 gal. you cant get VP U-4 local hear. and its 10.00 a gal. wear you can. thanks for any help anyone can offer.