HSR JET KIT COMES WITH 2 DIFFERENT COMPLETE SETS OF (4) MAIN JETS FOR WEATHER IN YOUR REGION, SET OF… 4 PILOT JETS, 4 AIR JETS, 4 TITANIUM NEEDLES, 4 DYNA SLIDE SPRINGS, 16 STAINLESS CARB TOP ALLEN BOLTS, QUICK AND EASY TO SELF INSTALL, COMPLETE PACKAGED KIT ALSO COMES WITH A JETTING CHART AND INSTRUCTIONS.