Stock Class

$5

CLASS: Stock
This class is intended for people to drop the deck (if they want) from their working mower and come out to race. BLADES MUST BE REMOVED This will be the first experience racing for some folks and could be the start of something great. This is the only class where rear engined mowers are allowed. The racing will be really close as long as the rules are followed.

AGE: Minimum age to race is 10, parental consent is required under the age of 18

ENGINE: All residential mower commercially sold vertical and horizontal shaft engines as they were delivered from the factory. The maximum allowable displacement is 49 cubic inches. Engine mods are limited to exhaust only, which should point toward the ground away from racer. Engine must be governed to max 3750 RPM.

STEERING: Stock steering is acceptable and in good operating condition.

DRIVELINE: The transaxle / transmission must be as delivered from the factory. Must retain stock pulleys, factory wheelbase and track, as well as factory ride height.

BODYWORK: No performance modifications allowed. Cosmetic modifications allowed at the discretion of the organiser.

RIMS/TIRES: Stock and bolt-on rear wheels are allowed as delivered from the factory. Tires must as be delivered from the factory.

CLASS: Stock
This class is intended for people to drop the deck (if they want) from their working mower and come out to race. BLADES MUST BE REMOVED This will be the first experience racing for some folks and could be the start of something great. This is the only class where rear engined mowers are allowed. The racing will be really close as long as the rules are followed.

AGE: Minimum age to race is 10, parental consent is required under the age of 18

ENGINE: All residential mower commercially sold vertical and horizontal shaft engines as they were delivered from the factory. The maximum allowable displacement is 49 cubic inches. Engine mods are limited to exhaust only, which should point toward the ground away from racer. Engine must be governed to max 3750 RPM.

STEERING: Stock steering is acceptable and in good operating condition.

DRIVELINE: The transaxle / transmission must be as delivered from the factory. Must retain stock pulleys, factory wheelbase and track, as well as factory ride height.

BODYWORK: No performance modifications allowed. Cosmetic modifications allowed at the discretion of the organiser.

RIMS/TIRES: Stock and bolt-on rear wheels are allowed as delivered from the factory. Tires must as be delivered from the factory.

Super Stock Class

$15

CLASS: Super Stock

This class is the next step in the search for speed with minimal modifications allowed. Super Stock

encourages you to develop your mechanical skills, gradually. The racing will be really close as long as the

rules are followed.

AGE: Minimum age to race is 14, parental consent is required under the age of 18

ENGINE: All vertical and horizontal shaft engines as they were delivered from the factory. The maximum

allowable displacement is 49 cubic inches. Engine modifications are limited to exhaust only, which should

point toward the ground away from racer. Engine must be governed to max 4000 RPM.

PULLEYS: The drive pulleys may be changed from stock. FOR THE 2026 SEASON the pulleys must not be

cast iron part as it may come apart (explode) at the high rpm it will now experience.

STEERING: Stock steering with minimal slop / play is acceptable but direct (kart style) steering is

recommended. No handlebars.

DRIVELINE: The transaxle / transmission may have the differential locked and have the reverse chain

removed. Must retain factory ride height, wheelbase and track.

BRAKES: Stock brakes are acceptable. The driver must be able to stop the mower within a reasonable

distance.

BODYWORK: Body modifications to facilitate lowering of the seat are allowed. No other performance

modifications allowed. Any wheelie bars must be limited to 18” maximum from the rear tires.

RIMS/TIRES: Rear rims maximum diameter allowed is 10”, front rim maximum diameter is 6”. Tires must

be standard Turf Saver, Turf Master style patterns as shown in the General Requirements.

CLASS: Super Stock

This class is the next step in the search for speed with minimal modifications allowed. Super Stock

encourages you to develop your mechanical skills, gradually. The racing will be really close as long as the

rules are followed.

AGE: Minimum age to race is 14, parental consent is required under the age of 18

ENGINE: All vertical and horizontal shaft engines as they were delivered from the factory. The maximum

allowable displacement is 49 cubic inches. Engine modifications are limited to exhaust only, which should

point toward the ground away from racer. Engine must be governed to max 4000 RPM.

PULLEYS: The drive pulleys may be changed from stock. FOR THE 2026 SEASON the pulleys must not be

cast iron part as it may come apart (explode) at the high rpm it will now experience.

STEERING: Stock steering with minimal slop / play is acceptable but direct (kart style) steering is

recommended. No handlebars.

DRIVELINE: The transaxle / transmission may have the differential locked and have the reverse chain

removed. Must retain factory ride height, wheelbase and track.

BRAKES: Stock brakes are acceptable. The driver must be able to stop the mower within a reasonable

distance.

BODYWORK: Body modifications to facilitate lowering of the seat are allowed. No other performance

modifications allowed. Any wheelie bars must be limited to 18” maximum from the rear tires.

RIMS/TIRES: Rear rims maximum diameter allowed is 10”, front rim maximum diameter is 6”. Tires must

be standard Turf Saver, Turf Master style patterns as shown in the General Requirements.

Modified Class

$15

CLASS: Modified

This class is the next step in the search for speed with a higher level of modifications allowed. The

Modified Single class encourages you to control your costs while building a single cylinder machine that

you can upgrade to a Twin when you are ready. The build options are wider and wilder!

NOTE! This class may be split up into MOD SINGLE and MOD TWIN if racer numbers allow.

AGE: Minimum age to race is 14, parental consent is required under the age of 18

SINGLE ENGINE: A vertical single cylinder shaft flathead or OHV engine is required; maximum allowable displacement is 33 cubic inches (549 cc). External modifications are allowed. The use of a billet flywheel is optional but recommended. No internal mods other than upgrading the valve spring retainers to a retainer with split keepers as a reliability consideration. The governor may be deleted, however RPM not to exceed 4500 unless billet flywheel is installed.

Bypassing the governor is not recommended.

TWIN ENGINE: A vertical shaft twin cylinder flathead or V-Twin engine is required, maximum allowable

displacement is 49 cubic inches (810 cc) for OHV engines and 46 cubic inches (750 cc) for flathead twins. The use of a billet flywheel is optional but recommended. No internal mods other than upgrading the valve spring retainers to a retainer with split keepers as a reliability consideration. The governor may be deleted, however RPM not to exceed 4500 unless billet flywheel is installed.

Bypassing the governor is not recommended.

PULLEYS: The drive pulleys may be changed from stock. THE 2026 SEASON The rear pulley must not be a re-used cast iron part as it may come apart (explode) at high rpm.

STEERING: Stock steering rod ends must be upgraded, and steering slop minimised. Direct (kart style)

steering is recommended. No handlebars.

DRIVELINE: The transaxle may have the differential locked and have the reverse chain removed. The use

of a transmission with a live axle is allowed. 1” is the minimum recommended size.

BRAKES: Stock brakes are acceptable. The driver must be able to stop the mower within a reasonable

distance.

BODYWORK: Modifications to support lowering of the seat and tire clearance are allowed. Any wheelie

bars must be limited to 18” maximum from the rear tires

RIDE HEIGHT: The minimum clearance between the frame and ground is 4”.

BUMPERS: A rear bumper is required per the general requirements. No other rear bumpers are

permitted, even those offered as factory options. Side bars are not required.

RIMS/TIRES: Stock and bolt-on wheels are allowed. Alloy kart, golf kart and ATV rims (not tires) are

allowed. Rear wheels can be up to 10” while maintaining the required ride height. Front wheels can be up to 6”. Tires must be standard Turf Saver, Turf Master style patterns as shown in the General

Requirements.

WHEELBASE / TRACK: The maximum allowable width (or track) is 42” from outside to outside of the

wheels. The allowable wheelbase is 56” maximum

CLASS: Modified

This class is the next step in the search for speed with a higher level of modifications allowed. The

Modified Single class encourages you to control your costs while building a single cylinder machine that

you can upgrade to a Twin when you are ready. The build options are wider and wilder!

NOTE! This class may be split up into MOD SINGLE and MOD TWIN if racer numbers allow.

AGE: Minimum age to race is 14, parental consent is required under the age of 18

SINGLE ENGINE: A vertical single cylinder shaft flathead or OHV engine is required; maximum allowable displacement is 33 cubic inches (549 cc). External modifications are allowed. The use of a billet flywheel is optional but recommended. No internal mods other than upgrading the valve spring retainers to a retainer with split keepers as a reliability consideration. The governor may be deleted, however RPM not to exceed 4500 unless billet flywheel is installed.

Bypassing the governor is not recommended.

TWIN ENGINE: A vertical shaft twin cylinder flathead or V-Twin engine is required, maximum allowable

displacement is 49 cubic inches (810 cc) for OHV engines and 46 cubic inches (750 cc) for flathead twins. The use of a billet flywheel is optional but recommended. No internal mods other than upgrading the valve spring retainers to a retainer with split keepers as a reliability consideration. The governor may be deleted, however RPM not to exceed 4500 unless billet flywheel is installed.

Bypassing the governor is not recommended.

PULLEYS: The drive pulleys may be changed from stock. THE 2026 SEASON The rear pulley must not be a re-used cast iron part as it may come apart (explode) at high rpm.

STEERING: Stock steering rod ends must be upgraded, and steering slop minimised. Direct (kart style)

steering is recommended. No handlebars.

DRIVELINE: The transaxle may have the differential locked and have the reverse chain removed. The use

of a transmission with a live axle is allowed. 1” is the minimum recommended size.

BRAKES: Stock brakes are acceptable. The driver must be able to stop the mower within a reasonable

distance.

BODYWORK: Modifications to support lowering of the seat and tire clearance are allowed. Any wheelie

bars must be limited to 18” maximum from the rear tires

RIDE HEIGHT: The minimum clearance between the frame and ground is 4”.

BUMPERS: A rear bumper is required per the general requirements. No other rear bumpers are

permitted, even those offered as factory options. Side bars are not required.

RIMS/TIRES: Stock and bolt-on wheels are allowed. Alloy kart, golf kart and ATV rims (not tires) are

allowed. Rear wheels can be up to 10” while maintaining the required ride height. Front wheels can be up to 6”. Tires must be standard Turf Saver, Turf Master style patterns as shown in the General

Requirements.

WHEELBASE / TRACK: The maximum allowable width (or track) is 42” from outside to outside of the

wheels. The allowable wheelbase is 56” maximum

Outlaw Class

$25

CLASS: Outlaw

This class is the ultimate step in the search for mower speed with the highest level of modifications

allowed. It isn’t unlimited…but nearly. Be ready though - a high level of mechanical and fabrication skill

is required.

AGE: Minimum age to race is 16, parental consent is required under the age of 18

ENGINE: Vertical shaft - Flathead / OHV Single / V-twin & Flathead Twin, Horizontal shaft - Honda Clone /

Vanguard / Kohler type, motorcycle, quad and snowmobile all allowed. The maximum allowable

displacement is 62 cubic inches (1000 cc). Internal and external engine modifications allowed. Engines

can be ungoverned, the use of a billet flywheel is required above 4500 RPM

BRAKES: Brakes must be upgraded to caliper/disc setup. Hydraulic brakes are HIGHLY recommended.

STEERING: Direct (kart style) steering is required. No handlebars.

THROTTLE: . All mowers MUST be equipped with an automatic throttle closing device.

DRIVELINE: The driveline must include a clutch. Right angle gearboxes, transmissions and live axles are

allowed. Centrifugal clutch and jackshaft style drivelines are allowed.

Chains and belts on the top side of the mower must have a protective cover of steel or aluminum.

Torque convertors rated to the HP of the engine are allowed.

FRAME: Reinforcement of the frame is allowed. The frame may use stock rails. The maximum frame

width is 15” to the outside. Custom fabricated frames are allowed and limited to 15” width.

RIDE HEIGHT: The minimum clearance between the frame and ground is 2”.

BUMPERS: A rear bumper is required per the general requirements. Front bumpers are optional.

SIDE / NERF BARS: Side nerf bars are required per the general requirements.

RIMS/TIRES: Reinforced stock wheels are allowed. Alloy kart, golf kart and ATV rims are allowed. Rear

wheels can be up to 10” while maintaining the required ride height. Front wheels can be up to 6”. Tires styles are open within the types as shown in the General Requirements. Tire cleats/spikes are not

permitted. No ATV tires allowed.

WHEELBASE / TRACK: The maximum allowable width (or track) is 42” from outside to outside of the

wheels. The allowable wheelbase is 58” maximum.