The rules on this website are just a rough draft, they are NOT OFFICIAL or complete, you must refer to the 2012 ISR rulebook and latest bulletins

(Adjustments in red)

Outlaw 600 General requirements

1.  All Outlaw 600 sleds must have a single 121” x 15” rubber track and 3 skis.  The sled must have a full roll cage located to the left of the tunnel and a 600cc engine reverse mounted with clutches to the right-hand side of the machine. The engine must be located in front of the tunnel/track.

2.  The brand of engine, hood, and logo’s need not match.

3.  All snowmobiles must comply with general rules section unless otherwise noted.

4.  Outlaw 600 sleds must weigh 895 pounds minimum with the driver in place after a race event. There is no minimum weight requirement for the chassis only. Ballast may be added to the sled to meet weight rules. The ballast must be securely mounted with two fasteners of 3/8 inch diameter for ballast up to 25 pounds, and four fasteners of 3/8 inch diameter for ballast over 25 pounds but less than 50 pounds. No ballast in excess of 50 pounds will be allowed. Ballast may not be mounted more than 12 inches above the floor pan. The ballast must be fastened to the frame or to ballast pan welded to the frame, or utilize commercial frame tube mounts to securely fasten the ballast to the chassis. All ballast must be painted black and carry the number of the race sled.

5.  Maximum width of the chassis is 54" measured at the outside of the skis. Minimum width at the same measurement point is 51".

6.  Maximum length is 82", minimum length 78", determined by measurement from ski mounting bolt centerline, to centerline of rear idler axle wheel.

7.  No titanium, magnesium, or carbon fiber is allowed anywhere in the construction of the sled.

8.  No remote adjusters are allowed on front or rear shocks.

9.  The sled seat must be constructed of a minimum 1/8" thick aluminum, and be a commercially available seat with head rest.

10.  A five point safety harness must be installed per requirements in - ISR General Rules Enclosed Cockpit Sleds.

11.  HANS devices, or other commercially available neck and head restraint devices are recommended.

12.  The sled must have an on board Halon type fire suppressant system per enclosed cockpit rules in General Rules Section.

13.  The driver must use approved Sprint car style arm restraints. See General Rules Section under Enclosed Cockpit.

14.  Window nets may also be used, but are not intended to replace an arm restraint

15.  Driver is required to wear an approved automotive style fire suit while driving the unit. The fire suit must be the final layer of clothing the driver is wearing and no other clothing can be worn over the fire suit.

 

 ENGINE

1.  Only the consumer production engines are allowed.  No sno-cross 200 build-300 build or 500 build engines are allowed.

2.  Allowable engines are: Arctic Cat 600 Twin 2004-2008, Polaris XC 600 Twin, 2000-2005 (64mm stroke) and Ski-Doo 600 HO 2003-2007

3.  No overbore is allowed.

4.  Oil injection pump mechanism and thermostats may be removed.

5.  No modifications to the crankshaft or crankcase except for as follows: Four (4) 1/8" diameter holes may be drilled into the crankcase to aid in lubrication of crank bearings.  An additional vacuum port may be drilled into the crankcase to utilize an additional pump for slide lube delivery.

6.  Allowable cylinder modifications are as follows.

      a. Exhaust ports may be modified but original flange angle and length must be maintained

      b. Exhaust valves may be modified, removed or replaced.

      c. Crankcase mounting deck height may be raised with gaskets or shims.

      No other cylinder modifications allowed.

7.  Pistons must be OEM stock or exact OEM replacement pistons. Wiseco or comparable lightweight pistons are not allowed. Piston weight will be verified against stock piston specifications.

8.  No modification to OEM or OEM replacement pistons is allowed.

9.  Cylinder head may be modified but original stock spark plug location must be retained.

10.  Carbs must be Mikuni 38 MM rack style flatslide with no modifications to the carb bore. Slides may be cut but no additional material may be added. Jets, needles and other tuning components may be replaced.

11.  No airbox allowed. Any filter, screen, or plenum may be used, but no method of pressurizing air inlet to the carbs will be allowed. This is at the discretion of the technical inspector.

12.  Carburetor restrictor plates or other method of restriction will be mandated. Final method and components will be available 6-1-2011

12.  Original water pump must be used without modification.

13.  Any engine mount, or engine mount torque limiter or retainer may be used.

14.  The only exhaust allowed for any brand engine will be approved vended Outlaw 600 Twin spec pipes with engine brand specific exhaust mount flanges. No modification of any kind to the pipes or flanges will be allowed. The inside diameter of tailpipes and silencers is not restricted. Pipes may be painted or coated to a maximum of .005" inch thick.  No heat wrap, heat tape or other method of insulation is allowed. No holes in the pipes or flanges for temperature probes are allowed.

15.  Hooper Racing will be the only approved vendor for the spec pipe. A method of identification and sequence will be in operation.

16.  No heat exchangers allowed. Radiators must be used for cooling, and must be mounted in front of the snowmobile chassis and all suspension components. No bumper or protective device is allowed in front of the radiator

 

 drive

1.  Any OEM stock production clutch is allowed. No modifications are allowed to the drive clutch. Tuning components may be replaced but the clutch must not be modified to accept any component. 

2.  Both drive and driven clutch must be located on right side of tunnel.

3.  No machining, grinding, cutting or welding allowed on clutches unless otherwise specified.

4.  Clutch guard must fully enclose both clutches and may be vented from the backside or bottom only

5.  Minimum thickness of clutch guard shall be .095” steel or 3/16" inch aluminum. No additional guard or nerf bar is allowed around or near the clutches.

6.  Any fully enclosed chain case/gearbox allowed. The case must be mounted on the left side of the tunnel and be driven by a solid steel jackshaft from the driven clutch.

7.  Center distance from jackshaft to track shaft shall be 6.250" minimum and 7.500" maximum.

8.  No belt drive chain cases allowed. 

9.  Final drive must be accomplished with a set of gears with an internal 6-spline drive, 1" wide, solid steel midget car racing quick change gears.

10.  The track drive shaft must be solid steel and may use any OEM plastic 9-tooth drive sprocket. No aftermarket track drive sprockets allowed.

11.  The clutch may be cooled with an auxiliary electric fan and appropriate ducting. Fan discharge cannot enter the engine area.

 

BRAKES AND THROTTLE CONTROLS

1.  Brake rotor must be steel material, 7.5" minimum diameter and minimum 3/16" inch thick. The rotor must be mounted on the right side of the track drive shaft inside the tunnel.

2.  Any commercially available hydraulic brake caliper allowed.

3.  Any commercially available master cylinder allowed.  The master must be of a design intended for foot operation. No stock or modified hand actuated master cylinders allowed.

4.  Brakes must be foot operated.

5.  An auxiliary electric fan may be used to cool the brake disc, caliper, and caliper housing. Ducting must discharge under/inside the tunnel.

5.  The throttle must be foot operated and have a solid stop under the pedal. A second or redundant spring must be added to aid in throttle return.

1.  All sleds in this class must use a four (4) bar trailing arm design front suspension with minimum 24" long trailing arms measured from rear mount bolt center to center of spindle weldment. The maximum caster angle allowed on the trailing arm shall be 30°.

2.  Maximum width shall be 54" measured outside of skis in a straight ahead position.

3.  Minimum width shall be 51" inches measured at the outside of skis in a straight ahead position.

4.  Only Fox coil-over steel body shocks are allowed for ski suspension positions.

5.  Only two skis are allowed on the front of the sled. 

6.  The third ski must be mounted behind the roll cage.

7.  Left rear ski suspension must be a single trailing A-frame design with a Fox steel body coil over shock. The maximum distance between the track and the left rear ski is 20". The rear of the trailing ski cannot extend past the center line of the rear idler wheel in the track suspension.  No cutting edge or wear bar is allowed on this trailing ski.

8.  The trailing ski must be fixed in lateral location and cannot be steered in any manner.

9.  All skis must be Wahl wide Champ ski #03-067 or #03-069A with no modifications to bottom surface. Front skis must be a minimum of 14" long excluding the ski loop. Rear (trailing) ski must be a minimum of 12" long and loop may be removed.

10.  Only one six inch carbide per front steering ski allowed.  No other cutting edges allowed.

11.  Any sway bar may be used.

12. Any manual steering system allowed. A maximum of 360 degrees of steering wheel rotation is required. Solid stops are required on the steering shaft to prohibit more than 360 degrees of rotation of the steering shaft.  Rack and pinion boxes are allowed. Steering reducer drive mechanisms allowed. Full round steering wheels are required.

13.  The steering shaft must have either a collapsible U-bend, splined sliding sleeve allowing for a minimum of 4" of movement, or sleeve with a lightweight shear mechanism that allows for 4" of travel in event of collision.

14.  Steering wheel must be used but may only rotate 175° maximum from steering stop to steering stop.

14.  Full circle, partial circle or butterfly wheels allowed.

15.  Steering wheels are allowed to be mounted to a quick release hub, for removal for ease of entry or egress to the cockpit. Quick release hub must be a commercially available product, no homemade or one off components allowed.

16.  Right ski must be offset from track 11" to 13". This is measured from right edge of track to right edge of ski in straight ahead position.

17.  The front bulkhead to which the front suspension components are attached must be  a minimum of 9" high above the floor pan (from floor pan to upper member) and must have a minimum width dimension of 30" to allow for safe location of the drivers feet, foot box construction, and  ability to operate controls

 

1.  Track and suspension must be contained inside the tunnel. No outboard shocks or linkages allowed.

2.  Only one shock may be used in the rear track suspension.

3.  Devices which link front and rear skid frame movement are not allowed. (No coupled suspension) The rear of the skid frame must travel and react independently of the front torque arm of the rear suspension.

4.  A maximum 8" rear idler wheel is allowed

5.  Slide Lube systems allowed. Tank location is unrestricted.

 

1.  Only a Camoplast #997R track will be allowed.

2.  The track must be used as produced by the molder of the track.  No cutting or other modifications allowed.

3.  One hole (to be specified ) may be cut in the track to aid in adjustment of front rail limiter.

4.  No weld on hooker plates allowed.

5.  Studs and backing plates to be determined (6-1-2011)

 

1.  Left bottom frame rail must be a minimum 1¼” x .083” steel square tube, and must extend from front of drivers foot box to behind rear main roll cage arch.

2.  Rear roll cage arch must be welded to top of frame rails and must be located and securely attached to the left side of the tunnel 17" to 20" inches ahead of the center of the rear idler wheel. Rear roll cage arch must be one continuous piece and cannot be angled more than 15° from vertical.

3.  Upper half of rear roll cage arch must be supported by at least one diagonal brace on each side. This must be located beside the driver’s shoulders. One additional brace is required behind the seat.

4.  Roll cage must be made of minimum 1¼” x .083” DOM seamless steel tubing.

5.  All roll cages must have 2 arch shaped structures extending at least 4" above the driver connected by 2 horizontal 1¼" x .083" tubes forming an opening large enough and in a shape conducive to the driver using as an exit if needed.

6.  The front arch member need not be one continuous piece.

7.  Minimum inside width of roll cage is 20”. Minimum length inside roll cage is 24” measured 18" up from floor pan.

8.  Side bars of roll cage must bow outward minimum 5" each side and top side bars must be minimum 17" vertical from the floor of the cage.

9.  Left side of roll cage must have either 3 bowed sidebars with connectors welded between all three and the main frame rail, or 2 horizontal side bars and 3 vertical bars connecting from second side bar to frame rail. All horizontal and vertical bars on left hand side of roll cage must be plated in the driver’s area.  Steel minimum .074” in thickness must be used. Plating shall extend from front vertical corner post of cage to rear vertical post of cage. Plating may be on top of cross bars in roll cage, or may be fitted between cross bars of cage. In either method the plating must be securely welded as to become a structural component of the cage. An additional 8" of plating must be located on the rear of the cage from the left rear vertical corner post inward behind the driver, to prevent intrusion into cage area from the rear.

10.  All roll cage tubes that may come into contact with driver’s helmet, elbows, knees or lower leg must be covered with approved high density roll cage protection foam material.

12.  Tunnel must be a minimum .080” material. Maximum width is 18" wide outside dimension and must fully enclose track to within 5" of the ground with rider in sled.

13.  Sled must have a minimum 22 gauge steel or 1/8" aluminum panel between driver and engine.

14.  Bumpers or nerf bars allowed only on rear of sled. No bumpers or nerf bars on front or sides of sled. All bumper ends must be capped or plugged.

15.  Minimum ground clearance (ride height) is 3.5" and the sled must have 2.5" of usable vertical suspension travel front and rear.

16.  No body panels may extend more than 27" above the ground or 1 inch in front of the ski loops.

17.  On the right hand side of the  roll cage no body panels may extend rearward past the junction of the  tailpipe to the expansion chamber.

17.  No body panels may cover skis or trailing arms

18.  No body panels may cover clutches or right side of tunnel. Entire right side of tunnel must be exposed except for the clutch guard.

19.  The nose (front body structure) of the sled must be a minimum of 20" wide and a maximum of 32" wide and the front leading surface must be within 25° of vertical. No pointed or wedge shaped cones allowed.

20.  Floor pan under driver must be minimum .060” aluminum or 22 gauge steel. Floor pan must not extend rearward under the fuel cell. Fuel cell to be so positioned and mounted that any lost fuel is directly deposited on the ground and cannot migrate into driver’s compartment.

21.  A 3 gallon maximum fuel cell with steel protective box must be used. The cell container must be securely fastened behind the roll cage within two inches of the tunnel. The container must be strapped down with two metal straps.

22.  All fuel line from fuel cell to fuel pump must be braided steel protected.  Fuel line may not run through driver’s compartment.

23.  The cell must have a minimum  22 gauge steel panel over the top of the cell and a minimum 22 gauge steel panel  across the entire width of the roll cage extending up a minimum of 17" from the floor pan.

24.  Fire extinguisher bottle/ system must be mounted behind driver, in a horizontal position. It must be mounted to the floor pan securely observing manufacturers recommendations for mounting. It is suggested that the fire suppression system be plumbed so that a minimum of one nozzle is directed to the driver’s compartment, and one nozzle is directed to the fuel cell area.  Additional nozzles if used may be directed to the engine/carburation area.

25.  No mirrors are allowed anywhere on sled.

26.  A windshield/windscreen, if used, must only be placed in front of the driver. Windshield must be of a design that protects    driver from elements and debris only. No aero effect windshields allowed.

 27. Outlaw sleds can be maximum of 50% white in color when viewed from any angle.

1.  Any production snowmobile ignition allowed. Ignition must be used as a complete package. No intermingling of components allowed.

2.  No lightening of flywheel is allowed.

3.  No modification or removal of ignition components in a particular set up is allowed.

4.  A rollover kill switch must be used that shuts off the engine in case the vehicle rolls over. This switch must operate independent of the normal kill circuit.

5.  A spec LED tail light (Yamaha #8GC-84710-02) must be used. No exceptions. Light must be illuminated at all times while on the racing surface, whether the engine is running or not.

6.  Tachometers and water temperature gauges only, may be added or removed. No other data acquisition devices may be used. Any testing sensors may not be in place at a competitive event.

7.  Spark plugs, spark plug wires and connector do not have to be OEM.

8.  No radio communication between driver and crew or “spotter” allowed.

9.  The tether switch must be mounted to the right of the driver and high enough in the chassis so that it is in full view at all times

10.  All sleds in the class must use a sealed 12 volt battery capable of running the taillight continuously for 15 minutes minimum.