Black Hills Mini Sprint Tour 2013
600cc Mini Sprint Rules
NOTICE:IN ADDITION ALL TRACK RULES APPLY AT TRACKS RACED.
SPECIFIC RULES
R-1) Age-Drivers age 18 and older with a valid driver’s license may compete. Drivers under 18 years of age must have a minor consent form signed byparent or legal guardianand the approval of the BHMST.
R-2) Roll Cage- Roll cages shall be at least 1 1/8-inch in diameter with .062-inch wall thickness. Roll cage will be made of chrome moly steel or equivalent material. The front section of the cage shall be no further back than the front edge of the steering wheel. Roll cage shall have sufficient fore and aft bracing and strength to support the weight of the car and driver in case of an upset. It is recommended that the cage have gussets at the intersecting bars to the uprights. Bends must have at least 3-inch radius. No square or pointed corners allowed. No square tubing cages allowed. Roll cage should be a minimum of three (3) inches above the driver’s helmet. It is mandatory to install a cross brace behind the seat to support the shoulder harness. You must incorporate a side bar of at least one (1) inch diameter to protect driver’s right arm. A left arm bar is also strongly suggested.
R-3) Bumpers and Nerfs- Cars must have a bumper extending beyond the front and rear tires. Nothing may extend beyond a tangent line from the outside edge of the tires to the bumpers. Nothing may extend beyond the outside edge of the tires or wheels, whichever is the widest. No sharp corners or design as to hook or damage. All cars must be equipped with nerf bars. Nerf bars must extend to the inside edge of the tires, but not beyond the outside of the tire. Bumpers can not extend more than 2 inches on each side wider than the frame.
R-4) Safety- Seat belts must be securely attached, and properly mounted to the car, and be used at all times. Metal to metal latches only. Five point seat belts, shoulder harnesses, and sub belt are required. Belt dates must not be over five (5) years old and must be in good condition. Arm restraints are highly recommended and used to keep the driver’s hands below the top of the roll cage. A neck brace is mandatory, and a banner net or helmet restraint is mandatory. Helmets must be full coverage, competition type, and one the three latest approvals. (SA2000, SA2005, SA2010) No motocross type helmets allowed. All drivers will wear a flame retardant suit. Flame retardant racing gloves required. BHMST strongly suggests the use of fireproof underwear, socks, and shoes.
Working “Raceceiver” radios are required by all drivers.
R-5)Electrics and Electronics- On and off switches must be mounted on dash with a fluorescent orange or red ring painted around it. Kill switch must be connected and functional. Electric fuel pumps must be wired to the on and off switch. No radio communication is allowed between the driver and the pits. All coils and ignition boxes must be mounted in an easily accessible location.
R-6)Battery- All wet cell batteries that are mounted in or near the cockpit must be covered and properly vented.
R-7)Fuel- 600cc powered cars may run only BHMST approved fuels. If Alcohol is used, an additive must be used to make the open flame more visible.
R-8)Weight- Single Cylinder 600cc powered cars and1998 and older engines minimum car and driver weight 750 pounds. 1999-2008 engines minimum car and driver weight 785 pounds.
R-9)Brakes- Brakes will be of sufficient strength so as to slide the wheels while the car is in motion.
R-10) Shocks- Any shock absorber legal, no adjustment of shocks from the cockpit or while the car is in motion.
R-11)Suspension- Tread- maximum 50 inches, minimum 32 inches as measured center to center of the tires. Maximum wheelbase shall be 70 inches, minimum wheelbase shall be 50 inches, as measured from the center of the front axle to the center of the rear axle. Steering- front wheels must be connected by a solid or tubular tie rod. Rear wheel drive only. All suspension bolts except wheel nuts must be secured by some type of locking device. Splined or keyed axles are allowed.
R-12)Tires and Wheels- Any wheel size and tire combination may be used, but tires may not exceed 23-inches in height. Wheels must be held on with four (4) or more studs or knock off hubs. Siping, grooving, and cutting of tires is allowed. No softening or chemically treating tires allowed. 2003(carbs) and older engines are allowed to run a D25 or harder Hoosier Right rear tire. 2003(inj) – 2008 engines must run a NMMA or ASCS-2or harder Right Rear tire. The other three tires are open choice.
R-13)Bodies- All cars must have complete bodies. Tail sections must be in place for all races. Recommended firewall between driver and engine, made of 24 gauge steel or .062-inch thick aluminum. Body must be made of aluminum, metal, fiberglass, or high impact plastic. All cars must be finished an attractive color(s). No mirrors of any kind allowed. The only part of the car allowed to be dismantled for the driver to enter or exit is a quick release steering wheel hub. Mud guards (visors and right side panels) must allow good vision for the driver.All mechanically operated devices (i.e. shifter) must be mounted below the driver’s shoulders. NO IN-COCKPIT ADJUSTMENT DEVICES WILL BE ALLOWED. All fuel tanks must be properly attached and equipped with a one-way check valve to prevent spillage of fuel in the case of a rollover.
R-14)Transmissions- Four cylinder engines must have transmissions with all stock working gears in working order. Any car with a shifting mechanism must have this device mounted in the cockpit area. Shift levers may be mounted on opposite side from chain drive. Chain guards are mandatory and will be made of .090-inch thick aluminum or equivalent and will run on top of chain from the front of the front sprocket to the center of the rear axle. Driver must not be able to touch the chain or sprocket while sitting in the cockpit. Any sprocket (520 thru 530) will be allowed.
R-15)Wings- All cars- Twelve (12) foot square maximum wing with right side board maximum 48-inches by 24- inches. Left side board maximum 48-inches by 20-inches. Left side board measurements may vary but must not exceed square inch maximum. All wings must have 1/16-inch radius edges or edging. No raw edges. No wood except for ribs or spars inside the center section. Wings cannot be lower than 4-inches below top of roll cage. Nose wings cannot exceed 4 square feet and the side boards cannot exceed 10-inches wide by 20-inches long. Nose wings must carry car number. Top wings are mandatory to start a race. No cockpit adjustable wings of any kind allowed. No split or multi-staged nose or top wings allowed. Wing center section must be one piece. Offset wings cannot exceed past the outside wheelbase of the car.
R-16)Numbers- All cars must have legible numbers applied in contrasting colors on both sides of the tail tank (12” min.) and wing (18” min.) and on the top of the wing(18” min.). Cars must have an 8” min. number on the nose and nose wing. Numbers must be separated from advertising so that they will be readable.It is the responsibility of the driver to make sure the number is visible for scoring.
R-17)Ballast- Any material used for ballast must be firmly attached as a part of the car’s structure. No liquid or loose ballast allowed. All weights must be white and have the car number painted on it.
RULES, COMPONENTS OR PROCEDURES SPECIFICALLY NOT MENTIONED AS BEING ALLOWED AREILLEGALUNLESS APPROVED AHEAD OF TIME BY THE BLACK HILLS MINI SPRINT TOUR TECHINAL DIRECTOR AND RACE DIRECTOR.
ENGINES
· 4 cycle air cooled, single cylinder engines, not exceeding 600cc are allowed, any modification will be allowed.
· 2 cycle engines up to 600cc out of bike single or dual cylinder are allowed.
· Out of town cars up to 750cc stock, must run and bring a copy of their rules.
· All 2 cycle engines and out of town cars will be evaluated by BHMST Tech Director. After one race the car and rules will be reviewed and evaluated to make sure competitive balance is kept within the BHMST.
· If a car shows up to race and that driver notifies the BHMST that it is non-compliant to the rules, the BHMST Race Director will take a consensus of the competitors, and if the majority of the group does not object, he/she will be allowed to race on a temporary basis. The car will start at the rear of each race, will receive “show-up points, but will not receive any points and/or money for competing. In addition, any competitor that finishes behind the non-compliant car will move up in scoring position as if the non-compliant car was not there.
E-1) Terms and conditions 2012 thru 2015
a) If a change or modification to the stock engine or its parts is not included in these rules then the modification is considered legal.
b) The word “Stock” means unmodified factory original parts or components that came with the original engine.
E-2) Overall Engine 2008 and earlier
a) No limited production race motors allowed. Must be a USA market production motorcycle engine, 4 cylinders, 4 stroke
a1) This applies to all OEM references herein.
b) No 2006 and up R6R (all black) Yamaha 600cc engines
b1) no variable-length intake system (YCC-I)
c) No titanium anywhere in or on the engine, unless it comes stock from manufacturer of engine on the production bike
d) Must have engine, clutch, and transmission all in one unit
e) Must be Chain Drive
E-3) Bore and stroke
a) 600cc maximum displacement
b) Stock original stroke and bore only
c) Must use stock pistons and stock piston rings
c1)2003(carb) and older engines; 620cc
NOTE: Grandfather claus; 2003 engines running on carbs fall into this group. 2003 on injection do not. This applies through-out the entire rule format.
E-4) Head and cams
a) NO PORTING of intake or exhaust runners.
a. Valve jobs, valve grinding, valve seating, valve seal modification and valve seat cutting are allowed.
b. Valve seat inserts may be reworked or replaced with any seat of original dimensions. Any dimensional thickness of the stock inserts may not be increased. Valve seats can be ground with multiple angles. Blending of the valve seat into the head is permitted but
cannot extend more than ¼” into the aluminum head measured from where the seat meets the head.
b) OEM Head only.
c) Stock cams only. (as came with that engine)
d) Stock valves only
e) No slotted cam gears
f) No cutting or milling of head or block
g) Stock head gasket must be used
h) 2003 and older engines (on carbs): stock valve size, any porting ok, any OEM stock cam from any year ok. Slotted cam gears OK. Head milling ok. Any head gasket ok. Any piston OK.
E-5) Bottom End
a) No machining to remove weight from the crank (balancing of crank is ok) (no after-market cranks) (no lightweight cranks)
b) No after-market connecting rods. Must use stock factory connecting rods.
a. Aftermarket rod bolts may be used
c) No dry sump systems are allowed unless it comes from the motorcycle manufacturer as original equipment.
d) 2003 (on carbs) and older, any rod OK.
E-6) Clutch/Transmission
a) Clutch
a. Clutch must remain operational
b. No aluminum clutches
b) No modification to the stock transmission gears, no close-ratio gears or nonstandard gear-ratios. All gears must remain in transmission, no removing any gears.
E-7) Ignition
a) No aftermarket ignition systems, must use factory Stock or factory racing ECU, No hot ECU boxes, no physically modified ECU boxes. Factory race boxes are ok, but must have the rev limit set to the street bike stock rev limit. Stock Rev Limiter must remain intact at all times (ex: no switched or gear specific limiters). All stock engine management hardware must be used, any software or Power Commander type device may be used to manage stock components. See specifications list for RPM limits. (ie: Hyper Racing)
b) All cars 2003(inj.) and newer must have the U6SA standard RPM connector for the track to check engine rpm rev limit. These are available from the chassis manufactures (hyper) and engine builders, or at the track. All cars must leave intact the rpm wire coming from the ECU.
c) May use different year ignitions from same manufacturer as long as stock rev limit of engine (not ignition) is retained.
d) No aftermarket coils
e) No gear position sensor may be used. The sensor may be in place on the engine, but can not have any wires connected to it; going to the ECU. Gear position wire from ECU may not be switchable. Neutral lights are OK.
f) No traction control device.
g) No more than one ECU box present in or on car. (Power Commander type devices are OK.)
h) A 50 rpm over rev tolerance for the purpose of tech inspection is acceptable. (Note: this does not mean you can turn up the rpms in any ECU by any amount)
i) 2003 (on carbs)and older, any and all ignition systems are legal. (any rev. limit OK) There is no need for a U6SA standard RPM Connector on these motors.
E-8) Air Induction system
a) No mechanically forced induction (turbo charging, supercharging)
b) Any OEM, 600cc, 4 cylinder, 4stroke, standard production USA market motorcycle carburetors may be used on any engine, regardless of year of engine.
a. Note: Switching to carburetors on engines that came with fuel injection usually increases the rev limiter due to the removal of the injectors as the ECU cuts fuel to limit rpm’s before it cuts the ignition. A reflash of the ECU will be required if using carburetors in order to comply with the rev limit rule 7.a)