Class rules

PRO OUTLAW 

Any track-driven snowmobile 

Any engines 

Gasoline, Methanol, Ethanol, or Nitromethane fuels ONLY 

Any power adders 

ISR Tunnel Enclosure is mandatory 

ISR Belt Guard is mandatory 

Tether kill-switch is mandatory 

Bright Red taillight is mandatory

Outlaw Rider Safety Requirements 

Full coverage all-leather suit or SFI SPEC 40.1/2 full coverage suit. 

Suits must be a one-piece design OR a two-piece design that is joined by a 360 deg zipper at the waist. 

Leather boots that completely cover the ankle with toe-area reinforcement 

Full-finger leather gloves are mandatory. Gloves must be Kevlar-lined or equipped with slider buttons and must have knuckle armor and palm reinforcement 

Single Layer Nomex Balaclava Helmet Head Sock / SFI SPEC 3.3 

No exposed skin other than the eye port(s) in the head sock 

Full Face Snell SA2015 / SA2020 Helmet w/Nomex interior and full 

Outlaw Nitromethane Snowmobile Requirements 

All Supercharged and Turbocharged Nitromethane entries using ANY percentage of nitromethane, (this includes VP M5 Methanol) must utilize a SFI SPEC 23.1 Burst panel. The Burst panel must be located in the charge tube or intake plenum and between the supercharger or turbocharger outlet/discharge and the intake valve. 

All Superchargers must utilize a SFI SPEC 14.2 restraint system OR the units must be integrated into the chassis. 

SFI Ballistic blankets are mandatory on ALL nitro entries, regardless of the percentage of Nitromethane. 

V-Twin Nitro entries require a SFI SPEC 46.1 engine restraint system 

For ALL electronic and mechanical fuel injection entries, all ignition ON/OFF and kill switches (including the tether kill switch) must also shut off the fuel 

Nitromethane is not allowed on any carbureted entries. 

PRO XTREME 55 

Any track-driven snowmobile 

Any OEM production-based snowmobile engine platform 

FUEL 

4-stroke - VP Q-16 REG or VP Import REG ONLY 

2-stroke - ANY Gasoline ONLY 

Approved Single power adder ONLY 

No water/methanol injection 

CVT drive ONLY 

No open or slotted “cheater” turbo compressor covers. Conventional anti-surge compressor covers allowed 

ISR Tunnel Enclosure is mandatory 

ISR Belt Guard is mandatory 

Tek-Vest OR full leather suit mandatory. Two-piece leather suits must be joined at the waist with a 360-degree zipper. 

Full face helmet is mandatory 

Tether kill switch is mandatory 

Bright Red taillight is mandatory 

PRO XTREME WEIGHTS 

Turbo 4-stroke – 55mm – 750lbs 

Turbo 2-stroke – 62mm – 700lbs 

Supercharged 4-stroke – 750lbs 

Nitrous – 650lbs 

N/A – 600lbs 

All weights are Sled & Rider at the conclusion of the run. 

Any Racer that fails to meet their respective minimum weight and/or bypasses the scales for ANY reason, will be disqualified. NO EXCEPTIONS 

PRO-MOD 

Any track-driven snowmobile

ENGINE

4-Stroke - Any OEM production snowmobile engine / NO BILLET Blocks or Heads 

2-Stroke - Any OEM production-based snowmobile engine platform / BILLET ALLOWED 

FUEL 

4-stroke - VP Q-16 REG or VP Import REG ONLY 

2-stroke - ANY Gasoline ONLY 

No water/methanol injection 

No nitrous oxide 

CVT drive only 

One (1) OEM Arctic Cat / Yamaha UNMODIFIED IHI Turbo 

 ISR Belt Guard 

ISR Tunnel Enclosure 

Tek-Vest OR full leather suit mandatory. Two-piece leather suits must be joined at the waist with a 360-degree zipper 

Full face helmet is mandatory 

Tether kill switch is mandatory 

Bright Red taillight is mandatory 

PRO-MOD WEIGHTS 

PRO-MOD 4-STROKE TURBO 

4 Cyl Turbo 4-stroke 780 lbs 

3 Cyl Turbo 4-stroke 775 lbs 

2 Cyl Turbo 4-stroke 700 lbs 

PRO-MOD N/A 2-STROKE 2CYL 3 CYL 4 CYL 

                                       -12%       Base      +7% 

Up to 950cc            549        624        668 

951 to 1050cc       572        650        695 

1051 to1150cc     591        672        719 

1151 to 1250cc     607         690        738 

1251 to1350cc      620        705        754 

1351 to 1450cc     633        719        769 

1451cc & over        642        730        781 

All weights are Sled & Rider immediately following the run 

Any Racer that fails to meet their respective minimum weight and/or bypasses the scales for ANY reason, will be disqualified. NO EXCEPTIONS 

In a continued effort to maintain parity, Snow Outlaws reserves the right to adjust the weights throughout the season. 

Any adjustments to the weights will be posted no less than 7 days prior to an upcoming event