PRO TWIN CLASS for 09

[George Herrin]

BTMRA new class the Pro-Twin class.

PRO TWIN CLASS
DRIVER REQUIREMENTS: Minimum Age: 18 years NO ROOKIES ALLOWED must have 1 year of ungoverned mower racing.

ENGINE OPEN: Max 25 HP max 44ci OEM Rated 4 cycle lawn equipment engines vertical or horizontal. Internal and external modifications allowed for all engines. After market aluminum billet flywheels are MANDATORY. Modifications to the block and heads are (Open). Note Block and heads must be of original OEM casting.

FUEL DELIVERY: No fuel injection, blower or turbo’s. NO electric fuel pumps allowed.

IGNITION: Open.

SAFETY SHIELDS: Cowling or safety shields (blower housings) must remain, subject to safety inspection. Engines must be separated by a safety shield or stock cowling (blower Housing) from the driver. (This applies more so to rear engine machines).

CHASSIS: Frames and parts, must retain original manufacturers (OEM) specifications (no chopping) re: wheel base, length and width. Material (steel round or square) may be added for structural strength. It is recommended that front axles be bolted or welded rigid eliminating the stock pivoting.

RIDE HEIGHT: 1.5" minimum from lowest point of chassis

WHEEL BASE: 42" minimum

CHASSIS WEIGHT: 275lbs minimum w/o driver

OVERALL WIDTH: 42" maximum side wall to sidewall

OFFSET: Off set is allowed but is specific. Center of frame to left tire sidewall 19". Center of frame to right tire sidewall 23"

BODY WORK: Can be customized but must retain some resemblance of a lawn tractor. All parts must be securely fastened to chassis i.e. fuel tanks, batteries, bodywork, etc.

FUEL: Only pump gas, 114-octane max (no additives) that includes N.O.S.

THROTTLE: Foot or trigger throttles with automatic spring return mandatory.  Two return springs mandatory.

KILL SWITCH: Tractor must have a working tethered kill switch and be fastened to driver any time engine is running. Cannot be homemade.

EXHAUST: Is open, as long as it points down and away from driver and presents no apparent hazard.

MOWER DECKS: may be fabricated but must appear to be a deck to some extent and must be minimum 1.5” ground clearance .

SEATS: Can be of Kart origin and must be mounted in center of tractor. Must be securely mounted.

BUMPERS/NERF BARS: Not Mandatory BUT highly recommended. If installed, Height 2" of centerline of axles, not to protrude 2" beyond the furthest point of body or tires. Max width rear bumper, 38". Max width front: Inside tires not to cover face of tire.
Side crash bars 1.5" in from outside of tires. No sharp edges.

BRAKES: Hydraulic brakes mandatory, front brakes highly recommended

DRIVE TRAIN: Is open to live axle, belt or chain drive custom gearboxes or transaxles. Centrifugal clutches allowed, where custom drive train may be hazardous to driver (exposed) protective shields must be installed. Discreet chassis modifications allowed for axle installation and reinforcement, but must maintain OEM stock wheelbase.  ATV drive train and suspension not allowed.

STEERING: Any improvements or modifications to steering allowed and recommended. NO stock steering allowed. All steering componeants must be double nutted or drilled and safety wired for maximum safety.

TIRES: Go Kart dirt slicks or grooved tires are allowed, (no snow hogs or deep lug tires)

WHEELS: must be made of metal, While you may use smaller rim sizes 6" front wheels and 8" rear wheels are strongly recommended. All wheels must have wheel retention in the form of castle nut with cotter pins, lock collars, snap rings, or thru bolts. Cotter pins alone are not suffecient.

[rebelracing16]

Ok George you have my gears a turning sounds like this may work. Engines are smaller so it keeps class around same speed as other classes, but gives us something different as far as chassis go. I think these machines will handle better and should be plenty safe. Lets see how it goes. Going to have to find me an engine sponcer and get started on a chassis soon!!!! It will take some trime to build this class but may bring in some new faces to the sport.

[Cromwellc4]

My brother and I are both going to build one.  I'm going to try and start on it over thanksgiving break.

[George Herrin]

Gotta finish Joe's before I can start mine. BUT I have the chassis and a Kart for parts.... Just a matter of building

[Hitchiker]

Ya ain't leaving me out Old Fart.

[George Herrin]

Below is two Canadian outlaws. This is the look we are after. Wild yet looks like a mower.

[George Herrin]

I have clarified the rules a bit....

[George Herrin]

How about a pro single class yall anyone interested in that also.

[bill morrow]

Will new classes further dilute our mower count in our existing classes?

[George Herrin]

I don't hink so. Those building a pro-twin are still racing all their normal classes with the exception of Tyler. And there is new interest in this class. Now if someone will follow thru and get them done. But I don't think it will hurt what we already have.

[TheMowchanic]

Now if someone will follow thru and get them done.

.............................. HUMMMMMMMMMMMM ...................... ...................

[Cromwellc4]

Mine is in the works. It will be done by mid April, maybe sooner