I have an 04 KFX700 V-Force and just bought a Complete Muzzy exhaust system.Muzzy would not give me a jet recommendation (ok by me ) He did state that at sea level they are running 145ft 148 rear with good results I,m at 1000 ft above sea level how would I calculate this.[img]i/expressions/face-icon-small-confused.gif[/img]

 

By looking at your plug and seing if it needs to be jetted.