4/1/2024 0 Comments K and n motorcycle air filters![]() Increase the pilot fuel jet size +1 for every +3 main fuel jet size increases. Note that this pilot fuel jet rule is for the main fuel jet size change BEFORE any main fuel jet altitude compensation is factored in: Pilot fuel jet size changes are related only to the change in main fuel jet sizes according to the main fuel jet size formula described above. PILOT FUEL JET SIZES CHANGES NEEDED PER TYPICAL MODIFICATION: Under a mis-match condition, such as when using pod filters with a 100% stock exhaust, or 4-into-1 header with stock filter and air box, then subtract 2 main fuel jet sizes. ![]() Decrease main fuel jet size by 2 sizes per every 2000' above sea level. Add up all the main fuel jet size increases and subtract 2 sizes. +4 main fuel jet sizes for individual pod filters (no airbox) +2 main fuel jet size for drilling holes in the airbox with stock filter +2 main fuel jet sizes for single K&N filter (inside a stock airbox) +4 main jet sizes for no muffler (open headers) +4 main fuel jet sizes for 4-into-1 exhaust ![]() +2 main fuel jet size for custom 4-into-2 exhaust MAIN FUEL JET SIZE CHANGES NEEDED PER TYPICAL MODIFICATION: The following useful guide to rejetting was posted by Mrkil in the forum. ![]()
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