Youth Snowmobile Racing

KC Pro West                   Rules

Required to Race

ISR Information

We use International Snowmobile Racing (ISR) rules.

Please download the rules and read through the document.

Resister with ISR

To race with KC Pro West you must register with ISR.

  1. Fill out Driver information
  2. License section
  3. chose “participant”
  4. Select “Irog Dog”
  5. Kitty Kat Annual License
  6. Answer medical question and submit

Information Resource

At The Track

Important Times

  • Driver and Parent meeting 9:30
  • Hot Laps to follow
  • Start racing at 10:00
  • The top 3 snowmobiles in each class will require Tech or their spot will be forfeit

Normal Running Order

Running order

    • Stock 120
    • B120
    • Champ 120/Open 206
    • 200 (10-14)
    • 200 (6-9)
    • Amateur 120
    • Semi Pro 206
    • 200 Outlaw
    • Pro 206
    • 200 Stock B
    • Improved Stock
    • 200 Stock A

Above: Race heat one in above order, followed by heat race two in above order, then Finals

    • Blast 
    • Junior (10-13)
    • Transition (8 – 10)
    • Junior (14-17)

Above: Race heat one in above order, followed by heat race two in above order, then Finals


    SnoCross Classes

    • Beginner age 4
    • Amateur age 5-12
    • Stock 120 age 5-12
    • Improved Stock age 6-12
    • Semi Pro 206 age 6-9
    • Pro 206 age 7-12
    • Open/Champ 206 age 7-14
    • 200 stock age 6-9
    • 200 stock age 10-14
    • 200 stock A
    • 200 stock B
    • 200 Outlaw
    • Blast 
    • Junior age 8-10
    • Junior age 10-13
    • Junior age 14-17
    * Stock Final is ran after B’s so all sleds can be switched over in time for improved stock. Top 3 will be teched immediately after Final is complete

    KC Pro West Specific Rules:

    Semi-Pro gearing is now restricted, you must run a 3.0 on Arctic Cat and 2.88 on Polaris, but the combination MUST be 15/45 for Arctic Cat and 16/46 for Polaris. Also, you must run a green slide.
    There can be NO ORANGE on the snowmobile per ISR safety rules. This includes decals, reflectors, seats, springs, numbers, etc. If it is orange it has to come off the sled or have tape placed over it. – This will be enforced, no exceptions.

    B120, Amateur Stock, Stock, and Improved Stock rules:


    Clutch may be replaced with aftermarket clutch of the same basic centrifugal design. Disc style drive clutches are not legal because they are not the same centrifugal design. (No variable ratio systems allowed.)

    Stock drive clutch engagement must be maintained on B120, Amateur, and Stock. Improved stock the engagement may be changed. Brake band may be changed to fit clutch.

    No belt drives allowed.

    Chain guard must be in place.

    Sprocket ratio changes may be made to: Polaris gearing 420 ratio which is Stock for the sled. All Cat, Yam and Ski doo allowed to run 410 gear ratios. This can be achieved with #35 chain or #40/420 chain, tooth count on sprockets must equal ratio required.

    Chain tensioner may be replaced with commercially available aftermarket tensioner.

    40 chain OR 35 may both be used, for clarification on 35 chain see ISR Rules

    All classes except B120 require a working rev limiter

    The B120 requires the original OEM governor to be intact, and functional. The motor is limited to 3850 rpm on a jack stand. The Race Tech’s Tachometer will be used to judge all B120s equally.



    B120 (typically for 4-year-old, but if your kid is still learning up to 6 will be allowed) is designed only for the most novice of rider. Entry into this class voids any other class entry for the day

    Amateur Stock (ages 5-12 are legal in this class) This is the next class as far as experience. This is a novice class also designed to teach the basics of racing. If you enter this class, you will only be allowed to race this class and Stock if you chose. 3 First places finish in Amateur
    will cause your child to be moved up to stock and no longer able to race in Amateur. Also, if your child is consistently finishing in the top 3 in stock, they will not be allowed to continue to race amateur.

    Stock (ages 5-12) This is the class where you understand the basics and are ready to also race things such as Improved stock and Semi Pro 206.

    Improved stock (6-12) This is the next level above stock and allows for open gearing, no restrictions on other class

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