Rules & Regulations 2021

Please refer to IKF rules manual for more specific rules and regulations
Specific Engine related rules refer to Briggs and Stratton or national body engine specifications
All Rules listed below override IKF Rules


  • Race Day:
    Weekend Races:  $60

    Sportsman Races:  $40

    Additional Class Entry:  $20

    Weekday Practice:  $30

    Weekend Practice:  $40

    Friday Practice on Race Weekend:  $20

    Pit Pass: $10

    Race Weekend Pit Pass (Friday/Saturday/Sunday): $15 Spud Cup only

    Transponder Rental: $10

    NOTE: The Spud Cup will have special pricing that will be announced separately

  • Anyone wishing to race or enter the pit area will be required to purchase a wrist band at registration.
  • Anyone under the age of 18 will be required to have a parental consent form signed before entering the pit area.


  • Please refer to the IKF rule book for requirements on Safety Items.
  • These will be strictly enforced throughout the year and a driver may be disqualified from the event if they do not adhere to the safety requirements.
  • This goes for personal safety as well as kart chassis safety requirements.


  • Protests must be written out and turned in to scoring or to the tech official and must be turned in within 30 min. of the completed race or session. They must include the rule or the issue.
  • The final say will be by the race director and any protest may not being finalized or have a determination until after the end the event.
  • We will not accept personal video for review on race calls


  • Green – to start the race.
  • Yellow – means that there is an incident and to procede with caution. There will be no passing allowed in the yellow area.
  • Black Rolled – means a warning for how you are driving and it is your final chance to fix it.
  • Waving Black – means you must leave the racing surface for either mechanical failure or detrimental driving.
  • Blue with Orange stripe – means the leaders are approaching and you are to allow them to pass and not race them. 
  • Red – means come to a slow, safe stop on the track.
  • White – means one lap to go.
  • Checkered – means the end of the race and you are to proceed to pit road at caution speed.


  • Numbers will be first come first serve and will be given to those participants who are competing full time.
  • If a number has not been used then the first person to use that number will receive priority. Any additional drivers using a already claimed number must either change their number or add a letter.
  • The Driver with their number from the previous year must make it known by the first race of the season if they wish to retain their number.
  • If a driver moves up a class and a driver in that class already has claim of that number they must choose a new number or add a letter.
  • All rookies must have an orange X on the back of their helmet or across the rear number plate. This will be required for a minimum of that drivers first three races.
  • All competitors must have numbers displayed on all four sides of the kart and the numbers must be clearly discernable. This will be in the judgement of the race officials.

Race Formats

  • Standard Format –
    • Will consist of four sessions
    • Practice, Qualifying, Heat Race, Main
    • Qualifying will determine the starting order of the heat race going fastest to slowest
    • The main event starting lineup will be determined by the finishing order of the heat race
  • Dual Heat Format –
    • Will consist of four sessions
    • Practice, Heat Race, Heat Race, Main
    • The first heat race starting lineup will determined by random draw
    • The second heat race will be a complete invert from the first heat race starting lineup
    • The main starting lineup will be determined by the lowest score from the two heats. (1st in a heat = 1 point) Tie breakers will be determined by fastest lap from the two heats.
  • Double Main Format –
    • Will consist of four sessions
    • Practice, Qualifying, Main, Main
    • The first main starting lineup will be set by qualifying times.
    • The second main starting lineup will be set by the fastest lap from the first main.
    • Each main will be ran as a separate points race
  • SPUDCUP Format - 
    • Club Race Version
    • Will consist of five sessions
    • Practice, Qualifying, Heat Race, Heat Race, Main
    • Practice, Qualifying, and Heats will be shorter than normal format lengths
    • First Heat Race starting lineup will be determined by Qualifying
    • Second Heat Race starting lineup will be determined by finishing order of First Heat Race
    • Main starting lineup will be determined by the combined score of the first two heat races with Qualifying being the tie breaker
    • Point system is 1 point for 1st, 2 for 2nd and so on meaning low score wins.
  • B Main –
    • Will be at minimum 75% of the A main race distance rounded down. (Example 75% of 14 lap main is 10.5 so B main would be 10 laps)
    • Will only be ran if there are more than 15 karts in a class
    • If a B main is required the structure and format for that class will be discussed during the drivers meeting
    • If you miss the drivers meeting and your class requires a B main you will automatically start last in the B main
  • NOTE: Rookies will be required to start last in all heat races regardless of format. (first three races) All formats will be able to be adjusted at the race director’s discretion but must be announced and made clear at the drivers meeting.

Race Procedures & On Track Activity

  • Starts:
    • Kid Karts and JR1 Novice will be a stand still start
    • All other classes will be rolling starts double file
    • All classes shall not be given the green flag until they have entered the start zone indicated by the big yellow line or Orange pylon cones.
    • The flagger will start the race not the leader.
    • Pace will be a nice even slow pace dictated by the leader.
    • Second shall not be in front of the leader once entering the start zone.
    • Drivers may not lay back and break out of formation to gain an advantage before the race has started. Drivers may not go outside the starting lanes until the green flag has been displayed.
    • Drivers will be given one warmup lap (one pass by the start finish line) and then must begin lining up for race
    • Sportsman class may be given two warmup laps based upon conditions
    • If a kart joins late they will not be entitled to a warm up lap but may still start in their original starting spot
    • If a driver misses the start they may still come on track until the field has taken the green to which they will be scored as a DNS.
    • If racers violate any of the above rules they will be subject to a minimum 5 second time penalty.
  • Restarts:
    • A restart will be signaled by a waiving yellow and red flag
    • A restart will only occur if the race director or main flagger deem it necessary
  • Red Flag Restarts
    • Will be single file restarts.
    • The leader will accelerate inside the start zone restarting the race.
    • No drivers are allowed to make a pass until they exit turn three
    • Once the field has exited turn three the track is fully green
    • If the red flag is thrown during lap one there will be a full restart with karts involved in red flag incident starting in the back if they are able to continue.
  • Exiting The Track
    • When exiting the track at any time a driver is required to raise their hand to allow other drivers to be aware they are slowing and leaving the track. Failure to do so can lead to penalties.
    • If you are off the track and cannot continue let officials nearby know and make your way safely away from the racing surface. You must also remove your kart from the area next to the track when it is safe to do so. Do not attempt to return to the pit area until the conclusion of the race. All junior drivers are to remain in their karts until track personnel arrive.
    • Once your engine dies or you get up out of your kart you are done for that session.


Please refer to the Points Format page for points breakdown

  • Points tie breakers
    • 1. Most wins
    • 2. Most Poles
    • 3. Highest finisher in Championship race main

Class Structure / General Rules

  • All Classes
    • Rear bumper must extend at minimum halfway covering the rear tires on each side and no farther than one inch beyond rear tires if they are on 6 inch rims. 7 inch rims bumper cannot extend beyond the outside part of the tire.
    •  Transponders must be a minimum of 12 inches behind the top of the centerline of the left king pin to the front edge of the transponder.
    • Transponders must be used in all official sessions. THIS INCLUDES PRACTICE.
    • An RLV-B91 muffler is required for all LO206 classes
    • RLV Silencer #4108 is required for World Formula
    • Mufflers must be safety wired to header or header bracket
    • Mufflers can be inspected at any time to determine safety and that they are secure
    • Header bolts shall be drilled and safety wired
    • If you move up from a junior class to a higher aged class you may not return to that original class. This applies even if this is done at another track.
    •  Weight: If you are under the weight limit you get one reweigh, if you are still under you go to last place for the race. There will be a one pound grace zone for all classes so if you come in 1 pound under your classes minimum weight you still pass.
    • If at any point a competitor gets up out of their seat they are done for that session. THIS INCLUDES WARMUP LAPS.
    • If a competitor fails a engine tech item they will be given a 20 min. cool down period. This only applies to engine tech items and will only be utilized after main events.
    • Max width for Junior/Senior classes 55 1/8"
    • Max width for Junior 1 level classes 50"
    • Fuel for our non-ethanol pump gas classes can be purchased at Chevron 10 min. from the track in Emmett.  This is the fuel used by the track.
  • Class Size
    • The maximum amount of karts allowed on track at one time is 15.
    • If a class’ kart count exceeds 15 karts then all practices, qualifying, and heats will be split.
    • The class will be then required to run a B main prior to their A main
    • If a class exceeds 12 karts but does not exceed 15 splitting the qualifying session will become an option of being split
  • Tires
    • SPUD CUP tires are TBD
    • The tires that are allowed are based off of the most common tire used in the Northwest
    • Kid Kart: no tire rule
    • Tire compound allowed for all classes besides Sportsman are Evinco Blue or Lecont Red, Sportsman are the Hoosier R80 tire.
    • JR 1 tire sizes are 4.5/10-5 front and rear
    • JR 2, Senior, World Formula tire sizes are 4.5/10-5 front and 6.0/11-5 rear (except R80 rear tires)
    • Hoosier R80 rear tires for all classes but JR1 are 7.10/11-5
    •  Senior 2 Cycle: Evinco Blue, Lecont Red
    • You must qualify and race on the same set of tires
    • Rain tires will be open tire rule
  • Kid Kart
    • Age: 5-7 (Must be the age of 5 before being able to perform any on track activity)
    • If turning 8 during race season may have option to stay in class
    • Can move up to JR 1 once the age of 7 is achieved.
    • Engine: Comer C50 or Honda GXH50, or Honda GX35 engines must remain 100% stock
    • Chassis: Kid Kart chassis only
    • Weight: no minimum
    • Fuel: pump gas only
    • This class will be a non-competitive class and will receive no points and will be ran with no transponders.
  • JR 1 LO206 and JR 1 LO206 Novice
    • Age: 7-11
    • If turning 12 during race season may have option to stay or move up to JR 2.
    • Will allow to stay in class if turning 13 during the race season with a waiver.
    • Engine: Briggs and Stratton LO206
    • Slide: Blue Slide Part #555734
    • Chassis: Rookie or adult size
    • Weight: 250 lbs. minimum
    • Fuel: Pump gas non ethanol
    • JR1 Novice will be a non points class with the intent to develop drivers and move them up to JR 1. Upward movement to JR1 will be ONLY approved by the track.
  • JR 2 LO206
    • Age: 11-15
    • If turning 16 during race season may have option to stay.
    • Engine: Briggs and Stratton LO206
    • Slide: Black Slide Part #555590
    • Chassis: Adult size only
    • Weight: 320 lbs. minimum
    • Fuel: Pump gas non ethanol
  • Senior LO206
    • Age: 15+
    • Engine: Briggs and Stratton LO206
    • Slide: Black Slide Part #555590
    • Chassis: Adult size only
    • Weight: 360 lbs. minimum
    • Fuel: Pump gas non ethanol
  • World Formula
    • Age: 15+
    • Engine: Briggs World Formula
    • Slide: Stock Slide Part #557083
    • Chassis: Adult size only
    • Weight: 390 lbs. minimum
    • Fuel: Pump gas non ethanol
  • Sportsman
    • Age: 15+ (Exhibition Class so a 15 year old JR2 driver would not lose JR2 eligibility)
    • Engine: Briggs and Stratton LO206
    • Slide: Black stock slide
    • Chassis: Ignite K3 (Basis of class), Open chassis
    • Weight: 360 lbs. minimum for lightweight, 390 lbs. minimum for heavyweight
    • Fuel: Pump gas non ethanol
    • Gear: 17:66
    • Tire: Hoosier R80 tire only
  •  Senior 2 Cycle
    •  Age: 15+
    •  Engines: IAME KA100, ROK VLR 100cc, Italian Motors X100AC
    • Chassis: Adult size only
    • Weight: 360 lbs. minimum, ROK VLR 100cc 350lbs. 
    • If an engine manufacturer is deemed to have an advantage weight may be added to even the playing field. Or mandatory dyno by Doug Fleming before being allowed to run again.
    • Fuel: Non Oxygenated Race or Pump Gas/oil only
    • Engine Rules: Based of Challenge of Americas Rule Set for 2021
    • Note Engine Rules: for 2022 season only engines that are approved by a National Sanctioning Body approved by Kart Idaho will be allowed to run

Rule Book Locations