F100

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For further rules and more detailed explanations of the rules listed below, please visit the F100 Rule Supplement

FK1

(Formerly F100 Senior Novice)

(Non-points developmental class)

  • Requires level 1 license
  • Engine @ min. lbs:
    • Yamaha KT-100
      • 4 hole can @ 300 lbs
      • HPV/RLV 3 pipe @ 340 lbs
      • Formula Y pipe @ 350 lbs (directdrive or clutch allowed)
      • Approved open pipe (see section 7b) @ 380 lbs
    • KPV/HPV
      • KPV/HPV/RLV 2 @ 360 lbs
      • HPV/RLV 3 @ 360 lbs
      • KPV/HPV 4 @ 390 lbs
    • Other 100cc piston port engines please email F100 at formula100kartingseries@gmail.com, for rules and technical specifications. Other 100cc piston port engines, such as a TKM BT82, ARC 100cc or PRD RK100, are allowed in level 1 classes.
  • Chassis
    • Junior or full size kart chassis only
      • No kid or cadet kart chassis
    • Must conform to NKA Trakbook chassis rules
  • Tires
    • Approved tires (see section 6a for a list of approved tires)
      • 4.5 or 4.6/10.0x5 front
      • 6.0/11.0x5 or 7.1/11.0x5 rear
  • Clutch
    • KT-100
      • Open, axle or crankshaft clutch or direct drive
    • KPV/HPV
      • Horstman EXPD or IAME clutch
        • 5500 rpm maximum stall speed
          • Subject to clutch stall speed test
  • Exhaust
    • KT-100
      • 4 hole can (RLV 7548 or 7540)
      • KPV 2 flex length 11.325” to 12.375” measured from piston
      • HPV 2 flex length 11.5” to 12.5” flex, RLV 9110 header required
      • RLV 2 flex length 8.875” to 9.875” flex, RLV 9110 header required
      • HPV 3 flex length 12” to 12.5” flex, RLV 9110 header required
      • RLV 3 flex length 9.375” to 9.875” flex, RLV 9110 header required
      • Formula Y (RLV 8787 and spec header) flex length 12.25” to 12.75” measured from piston
      • Approved open pipe (see section 7b)
    • KPV/HPV


      • KPV 2 flex length 11.375” to 12.375” measured from piston
      • HPV 2 flex length 11.5” to 12.5” measured from piston
      • RLV 2 flex length 8.875” to 9.875” measured from piston
      • HPV 3 flex length 12” to 12.5” flex
      • RLV 3 flex length 9.375” to 9.875” measured from piston
      • HPV 4 flex length 10” to 10.5” measured from piston
      • KPV 4 flex length 9.875” to 10.375” measured from piston
  • Fuel
    • Please see section 3A

FK2

(Formerly F100 Senior Intermediate)

  • Invitation/approved only, requires level 2 license
  • Engine @ min. lbs:
    • Yamaha KT-100
      • HPV/RLV 3 @ 340 lbs
      • Formula Y pipe @ 350 lbs (directdrive or clutch allowed)
    • KPV/HPV
      • HPV/RLV 3 @ 360 lbs
  • Chassis
    • Full size kart chassis only
    • Must conform to NKA Trakbook chassis rules
  • Tires
    • Bridgestone YLC, YKC or YHC
      • 4.5/10.0x5 front
      • 7.1/11.0x5 rear
  • Clutch
    • KT-100
      • Open, crankshaft clutch or direct drive
    • KPV/HPV
      • Horstman EXPD or IAME spec clutch
        • 5500 rpm maximum stall speed
          • Subject to clutch stall speed test
  • Exhaust
    • KT-100
      • HPV 3 flex length 12” to 12.5” flex, RLV 9110 header required
      • RLV 3 flex length 9.375” to 9.875” flex, RLV 9110 header required
      • Formula Y (RLV 8787 and spec header) flex length 12.25” to 12.75” measured from piston
    • KPV/HPV
      • HPV 3 flex length 12” to 12.5” flex
      • RLV 3 flex length 9.375” to 9.875” measured from piston
  • Fuel
    • Please see section 3A

FK3

(Formerly F100 Senior Advanced)

  • Invitation/approved ONLY, requires level 3 license
  • Engine @ min. lbs:
    • Yamaha KT-100
      • Formula Y pipe @ 350 lbs (directdrive or clutch allowed)
    • KPV/HPV
      • HPV/RLV 3 @ 360 lbs
  • Chassis
    • Full size kart chassis only
    • Must conform to NKA Trakbook chassis rules
  • Tires
    • Bridgestone YLC, YKC or YHC
      • 4.5 or 4.6/10.0x5 front
      • 7.1/11.0x5 rear
  • Clutch
    • KT-100
      • Open, crankshaft clutch or direct drive
    • KPV/HPV
      • Horstman EXPD or IAME spec clutch
        • 5500 rpm maximum stall speed
          • Subject to clutch stall speed test
  • Exhaust
    • KT-100
      • Formula Y (RLV 8787 and spec header) flex length 12.25” to 12.75” measured from piston
    • KPV/HPV
      • HPV 3 flex length 12” to 12.5” flex
      • RLV 3 flex length 9.375” to 9.875” measured from piston
  • Fuel
    • Please see section 3A