These kits include a set of 4 two size larger Pilot Jets (#42), a set of 4 five sizes larger Main Jets (#148) and 2 needle shims for each carburetor
Stage 5 is for motorcycles with lightly modified engines with individual air intakes and non-baffled exhaust system (racing use only)
Modifications to the air intake and/or Exhaust system to your motorcycle will change the air/fuel mixture to your carburetors causing a lean running condition.
This Jet Kit will compensate for the lean running condition.
Lean running conditions can destroy your engine and decreases overall performance.
This Jet kit is easy to install and does not require drilling the needle slides but does require some basic carburetor tuning knowledge.