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Revised
February, 2007   

IT IS THE RESPONSIBILITY OF THE BUILDER AND DRIVER
TO ADHERE TO, AND BE FAMILIAR WITH, THE REQUIREMENTS OF THIS SECTION.
 

RACING CLASSES 

ORIGINAL

Up to 12 HP.  Will race on road course or modified ovals.

OPEN

Up to 18 HP. Will race on oval or modified oval course

NOTE: There may be some specialty races that have special courses designed
for the occasion. 

ENGINE & DRIVE TRAIN 

ENGINES 

Engines will be those designed for riding lawn mower usage. 
Recognized engines include Briggs & Stratton, Tecumseh, Robin, Wisconsin,
Kohler Kawasaki & Honda. 

ENGINE MODIFICATIONS 

All engines will be out of box stock.  The only internal modifications
allowed will be replacing valve spring retainers on overhead valve engines. 
Engines may be rebuilt, and must not exceed manufacturers stock specifications
with stock replacement parts.  No performance enhancing parts may
be used.  Ignition must be stock, however, older points systems
may be replaced with stock electronic ignition.  Stock timing only. 
External modifications are limited to removing the muffler and replacing
it with a header, disconnecting the governor, and replacing or modifying
the air cleaner.  Crankcase ventilation system may also be modified.

Carburetor jets on gravity systems may be repositioned to solve stalling
but must not exceed the stock jet size. 

STARTERS 

Electric or pull start only.  No push starting, or external starting
units.  All electric start mowers must have a hard mounted, protected,
operating battery on board, capable of starting the engine.  Jump/push
starts may be allowed if the unit has been damaged during the race. 

GAS TANK & FUEL 

Gas tanks must be securely attached and reasonably protected. 
Pump gas only.  No octane boosting fuel additives may be used. 
Fuel additives such as Sea-Foam may be used as long as they do not affect
the octane rating of the fuel.  Stock fuel systems only. No auxiliary
fuel systems (nitrous oxide, etc.).  In-line fuel shut off valve
is required.  The shut off valve must be easy to reach and clearly
visible.   Electric fuel pumps are allowed and must have a
safety kill switch system approved by the technical inspector. Note: No fueling a running engine. 

THROTTLES 

Any type of throttle may be used.  Twist grip, thumb throttle,
squeeze grip or foot pedal.  Must operate freely and have an operating
return spring. 

SAFETY KILL SWITCH 

Must have a breakaway type, grounded kill switch, which will turn
off the ignition if the driver leaves the mower.  Must be securely
attached to the driver while operating the mower.  Cord length
must not exceed 30.  Commercially prepared switches are required.
 

TRANSMISSION/TRANS-AXLE/SPINDLES 

Transmission must be from a lawnmower.  Solid axle recommended. 
Differential maybe locked and may be strengthened or remade from heavier
steel.  NO go kart spindles.  L type spindles only.  Double
locking devices are highly recommended on front and rear wheels. 

BELTS & CHAINS 

Any exposed belts or chains must have a secure guard. 

CLUTCH 

Will be a fully functional lawnmower type clutch.  Centrifugal
clutches on engine shaft only in conjunction with lawnmower type clutch. 
Cannot be primary clutch drive.  Original lawnmower centrifugal
clutch must be used.  No torque modifying torque converters may
be used, such as on Snowmobiles  

BODY & FRAME 

BODY  

Mowers will have lawnmower hood and fenders.  May be modified
to fit the frame. 

FRAME/SUSPENSION

Must have a lawnmower frame.  If stock
frame is inadequate for racing, it may be reinforced.  No custom frames. 
No aluminum frames, front ends, or bumpers.  No suspension (shocks
& springs). Overall width front and rear not to exceed 36. Ground
clearance minimum of 5 to lowest part of frame or front axle. Excludes
foot pegs, mower decks, and nerf bars   

STEERING 

Steering arms and tie rods may be upgraded and strengthened. Strengthened
tie rods must be a minimum 3/8 all thread rod with ½ square or round
stock cover, or equivalent.  Steering stops are required. Steering
wheel or handlebars may be used. 

SEAT  

Any style may be used and must be securely fastened. 

TIRES/WHEELS 

Any type of lawnmower turf or stud tire allowed.  Must be in
good condition.  No snow hogs, stryker, tiller tires, ATV or tractor
lug treads.  Steel wheels are required and strengthening the wheel
is highly recommended.  Front wheel bearings are also recommended.
 

BUMPERS/NERF BARS/SAFETY BARS 

Steel front bumpers are allowed.   The leading edge of the
bumper may not extend forward more than 2 past the leading edge of
the hood.  The leading edge of the hood will be determined by dropping
a line down the nose of the hood to the ground.  Bumpers must be
within the inboard edge of the front tires.  Ends of the bumper
must be bent or curved ( \_____/ ) and extend rearward far enough to
prevent mowers from hooking up.  Rear bumpers must not exceed rear
tire width.  32 recommended width.  No vertical front or
rear bumper style nerf bars, unless they are commercially made for riding
lawn mowers.  Mower deck type side safety bars (ATV style nerf
bars) or running boards required.  Foot pegs alone are not allowed. 
Side safety bars may not exceed a line between the outside edges of
the front and rear tires.  Must be securely fastened. 

MOWER DECKS/BLADES  

Mower decks are optional, but encouraged.  NO BLADES.  Blades MUST be removed. 

BRAKES 

Brakes are mandatory.  Brakes must be in good condition, easily
operated, and operating on at least two wheels.  Must function
in or out of gear.  Brakes may be upgraded and improved in any
way. 

GLASS/SHARP EDGES 

No glass.  All sharp edges or projections will be covered or
removed before entering the track.  Headlights may be mounted for
night racing when permanent lighting is not available.    

PERSONAL SAFETY GEAR/EQUIPMENT

HELMETS

A DOT approved full face helmets are required.  Attached lower
face protectors are allowed as long as they protect the jaw area. 
Helmet face shields are acceptable. 

NECK BRACE

Neck braces designed for racing applications are required (Ex. RCI,
Simpson, Crow). 

CLOTHING

Long pants (no shorts), and long sleeved shirts are required. 
Gloves are highly recommended. 

BODY ARMOUR/ADDITIONAL PADDING

Knee and elbow pads are highly recommended.  Body armor, which
includes chest, back, and shoulder pad protection are required in all
classes.  Motocross style chest protectors may fulfill this requirement
and is highly recommended.

FOOTWARE

Heavy shoes that cover the ankles must be worn.  NO
tennis shoes.  Motorcycle racing style boots are highly recommended.

SAFETY RULES / GENERAL INFORMATION 

NO ALCHOHOL OR DRUG CONSUMPTION
BY RACERS OR PIT CREW WILL BE TOLERATED PRIOR TO, OR DURING ANY RACE
EVENT.  Violation will be cause for immediate
disqualification from the race.

CONDUCT 

Any unsafe action is cause for immediate disqualification.  Intentional
ramming will be a disqualification.  Any un-sportsmanlike conduct
by driver or pit crew will be a disqualification.

INSPECTION