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Class Rules

    https://wkcr.net/rules/class-rules#:~:text=General%3A%201%20Snowmobile%20must%20be%20an%20ISR%20120%2F4,120%2F4%20stroke%20classes%20are%20allowed%20in%20the%20champ.
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Rules - International Snowmobile Racing, Inc.

    http://www.isrracing.org/rules.cfm?aID=10021
    Racing Aspects & Rules. Asphalt Racing; Cross Country; Cross Country - Junior; Drag Racing Junior; Enduro; Enduro - Junior; Grass Drag Racing; Hillclimb ; Hillcross; Ice Drag Racing; Ice LeMans; Oval Sprint; ... International Snowmobile Racing 1527 N Railroad Street. Eagle River, WI 54521. Office: 262-335-2401

Rules - International Snowmobile Racing, Inc.

    http://www.isrracing.org/rules.cfm?aID=10007
    Racing Aspects & Rules. Asphalt Racing; Cross Country; Cross Country - Junior; Drag Racing Junior; Enduro; Enduro - Junior; Grass Drag Racing; Hillclimb ; Hillcross; Ice Drag Racing; Ice LeMans; Oval Sprint; ... International Snowmobile Racing 1527 N Railroad Street. Eagle River, WI 54521. Office: 262-335-2401

Official ISR Racing Rules | Woody's Traction

    https://www.woodystraction.com/racing/official-isr-racing-rules/
    Official ISR Racing Rules Here are the links to the latest snowmobile racing rules from International Snowmobiling Racing, Inc. PLEASE NOTE: Every racer participating in an ISR sanctioned event must have an ISR ID number. To get one, you must register on the ISR website which you can get to by clicking here. ISR APPROVED SPEC GAUGE

International Snowmobile Racing, Inc.

    http://isrracing.org/
    International Snowmobile Racing 1527 N Railroad Street. Eagle River, WI 54521 Phone. Office: 262-335-2401 Cell: 715-617-5054 Fax: 715-479-8947 ... Pro Stock Ice-Grass-Snow drag race rules DRIVE Section of Belt Drives. View All Bulletins. News View all articles. USAC Claim Form. International Snowmobile Racing.

SNO CROSS 2021-22 - International Snowmobile …

    http://www.isrracing.org/tempPDF/Sno%20Cross.pdf
    ISR supports this requirement. PRE-RACE SAFETY INSPECTION 1. ANY ENTRY IS SUBJECT TO INSPECTION AT ANY TIME UPON REQUEST BY THE RACE DIRECTOR OR TECHNICAL DIRECTOR. 2. Pre-race safety inspections are mandatory at all races. Passing a pre-race safety inspection is no guarantee that a snowmobile complies with all rules for the event.

Cross Country 2021-22 - International Snowmobile Racing, Inc.

    http://www.isrracing.org/tempPDF/Cross%20Country.pdf
    The number must be a minimum of six (6) inches high, 3/4 inches wide and be displayed in contrasting colors. Numbers must also be displayed on both sides of tunnel, minimum four (4) inches high. These numbers must be displayed on the snowmobile in a permanent manner before being allowed to race (see illustration).

Rules & Classes - Snowmobile Racing | USSA ProStar

    https://ussaprostar.com/rules-classes/
    The USSA PROSTAR Racing Series uses ISR (International Snowmobile Racing) rules. These rules are discussed every spring at the ISR meeting and voted on by USSA members, of which, the USSA PROSTAR Racing Series is one. These rules focus on safety and making the races as fair and competitive as possible. Please click the button below to read them for …

VINTAGE OVAL 2021-22 - International Snowmobile …

    http://isrracing.org/tempPDF/Vintage%20Oval.pdf
    The driver’s assigned competitive number must be displayed on both sides of snowmobile hood. The number must be a minimum of six (6) inches high, 3/4 inches wide and be displayed in contrasting colors. 2. These numbers must be displayed on the snowmobile in a permanent manner before being allowed to race (see illustration).

GRASS – ICE - SNOW DRAG RACING

    http://www.isrracing.org/tempPDF/Grass%20Drag%20Racing.pdf
    A snowmobile will be allowed to race in its respective displacement, or designated performance class, and any larger displacement or performance class, except as noted in specific sections. REGISTRATION AND ENTRY 1. WAIVER FORMS ARE MANDATORY FOR ALL PERSONNEL IN SECURED AREAS (paddock, staging and track). 2.

SNO CROSS RACING COMPETITION STOCK CLASS RULES

    http://www.midwestsnocross.com/PDF/120%20200%20ISR%20RULES.pdf
    IMPROVED STOCK RULES GENERAL 1. Snowmobile must conform to Stock class rules unless stated otherwise in this section. DRIVE 1. Gear ratio may be changed. 2. #35 chain may be used Listed. (All Brands in competition) 3. Clutch may be replaced with aftermarket clutch of the same basic centrifugal design. Disc style drive clutches are not legal because they

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