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Limited Modified Classes FOR BTMRA 2013

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Author Topic: Limited Modified Classes FOR BTMRA 2013  (Read 92 times)
George Herrin
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« on: November 18, 2012, 09:51:31 pm »

below guys n Gals are the two new classes we will run next year. You have heard us talk about them here are the rules for them.


LIMITED MOD SINGLE (LMS)
• ENGINE: Honda or Clone 390 or 420 Engines must be Factory stock and complete with the exception of stock fuel tank. The governor must be intact and set at 3650 rpm and only adjustable at engine. A pulse fitting may be added to valve cover for external fuel pump.
• FUEL DELIVERY: No fuel injection, blower or turbo's. NO electric fuel pumps allowed.
• IGNITION: STOCK. No timing changes or key alterations Spark plug wires must maintain a minimum 2” section of untaped wire and must be accessible by technical inspectors.
• 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.
• CHASSIS: ENGINE MUST BE IN THE FRONT. Frames and parts must originate as a lawn mower chassis and 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. This is NOT a National class  so if your building just for local racing you can build a square tube chassis. Frames must be 1x2 or 1x3 rectangular tubing max 15” wide 51” long (end to end) this does not include front axle. Material (steel round or square) may be added for structural strength. Front axles must be welded rigid eliminating the pivoting. No kart chassis notched and put over frames.
• RIDE HEIGHT: 2" minimum from lowest point of chassis. 4" maximum height.
• WHEEL BASE: 42" minimum 48” maximum.
• OVERALL WIDTH: Wheel width max 42" wide. Offset allowed and measured from center of chassis. Maximum offset is center of chassis to outside right tire 23" and center of chassis to outside left tire 19"
• BODY WORK: MUST USE MOWER HOOD. Can be customized but must retain some resemblance to a lawn tractor. All parts must be securely fastened to chassis i.e. fuel tanks, batteries, bodywork, etc.
• FUEL: Only pump gas, 97-octane max (no additives). N.O.S is not permitted. No fuel injection, blowers or turbo’s. No electric fuel pumps permitted.
• THROTTLE: Foot or trigger throttles with automatic spring return mandatory. Dual return springs are mandatory.
• KILL SWITCH: Tractor must have a working tethered kill switch and be fastened to driver any time engine is running. Kill switches 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 and must maintain a minimum 2” ground clearance.
• SEATS: Can be of Kart origin and must be mounted in center of frame. Must be securely mounted. While some degree of inclination is expected with kart seats, drivers should not be seated in a “lay down” position.
• BUMPERS/NERF BARS: Are required, they should meet the following specifications- height within 2"of the centerline of axles, not to protrude beyond the furthest point of body or tires. Maximum width of rear bumper is 38". Maximum width front bumper should remain inside tires and not cover the face of the tire. Side Nerf bars must not protrude beyond the furthest point of body or tires. No sharp edges. No conduit allowed. ALL bumpers and Nerf Bars must have a 1/8” inspection hole drilled in order to check material size.
• BRAKES/CLUTCHES: Must be intact and working.  If not equipped with a neutral gear all tractors must have a clutch lock out so machine can be pushed by hand.  When running a centrifugal clutch, driver must be seated on machine to have it started or rear wheels securely off the ground. Hydraulic brakes mandatory on rear rear axle. Front Brakes are not allowed.
• DRIVE TRAIN: Is open, chain guards must be made of at least 1/8” thick material. Centrifugal clutches are permitted STAR CLUTCHES only. In instances where custom drive train may be hazardous to driver (exposed) protective shields must be installed. ATV drive trains and suspensions are not permitted.
• STEERING any improvements or modifications to steering are allowed and recommended. NO stock steering allowed. All steering components must be double nutted or drilled and safety wired for maximum safety. Padding must be added to the center of the steering wheel and Quick release hub locks Must be drilled and pinned.
• TIRES: MUST be Lawn mower Tires ONLY!!
• WHEELS: NO STOCK WHEELS must be made of metal. While smaller rim sizes are permitted, 6" front wheels and 8" rear maximum size only. All wheels must have wheel retention in the form of castle nut with cotter pins, lock collars, and snap rings, thru bolts or center bolts. Cotter pins alone are not sufficient.

LIMITED MODIFIED TWIN (LMT)
• DRIVER REQUIREMENTS: Age requirements 16 and up.
• ENGINE: Briggs Only, 44 Cubic Inch maximum. Vertical Engines must be Factory stock, and complete. The governor must be intact and set at 3650 rpm and only adjustable at engine. A pulse fitting may be added to valve cover for external fuel pump if not already there..
• FUEL DELIVERY: No fuel injection, blower or turbo's. NO electric fuel pumps allowed.
• IGNITION: STOCK. No timing changes or key alterations. Spark plug wires must maintain a minimum 2” section of untaped wire and must be accessible by technical inspectors.
• 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.
• CHASSIS: ENGINE MUST BE IN THE FRONT. Frames and parts must originate as a lawn mower chassis and 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. This is NOT a National class  so if your building just for local racing you can build a square tube chassis. Frames must be 1x2 or 1x3 rectangular tubing max 15” wide 51” long (end to end) this does not include front axle. Material (steel round or square) may be added for structural strength. Front axles must be welded rigid eliminating the pivoting. No kart chassis notched and put over frames.
• RIDE HEIGHT: 2" minimum from lowest point of chassis 4" maximum height.
• WHEEL BASE: 42" minimum 48” maximum.
• OVERALL WIDTH: Wheel width max 42" wide. Offset allowed and measured from center of chassis. Maximum offset is center of chassis to outside right tire 23" and center of chassis to outside left tire 19"
• BODY WORK: MUST USE MOWER HOOD. Can be customized but must retain some resemblance to a lawn tractor. All parts must be securely fastened to chassis i.e. fuel tanks, batteries, bodywork, etc.
• FUEL: Only pump gas, 97-octane max (no additives). N.O.S is not permitted. No fuel injection, blowers or turbo’s. No electric fuel pumps permitted.
• THROTTLE: Foot or trigger throttles with automatic spring return mandatory. Dual return springs are mandatory.
• KILL SWITCH: Tractor must have a working tethered kill switch and be fastened to driver any time engine is running. Kill switches 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  and must maintain a minimum 2” ground clearance.
• SEATS: Can be of Kart origin and must be mounted in center of frame. Must be securely mounted. While some degree of inclination is expected with kart seats, drivers should not be seated in a “lay down” position.
• BUMPERS/NERF BARS: Are required, they should meet the following specifications- height within 2"of the centerline of axles, not to protrude beyond the furthest point of body or tires. Maximum width of rear bumper is 38". Maximum width front bumper should remain inside tires and not cover the face of the tire. Side Nerf bars must not protrude beyond the furthest point of body or tires. No sharp edges. No conduit allowed. ALL bumpers and Nerf Bars must have a 1/8” inspection hole drilled in order to check material size.
• BRAKES/CLUTCHES: Must be intact and working. If not equipped with a neutral gear all tractors must have a clutch lock out so machine can be pushed by hand.  When running a centrifugal clutch, driver must be seated on machine to have it started or rear wheels securely off the ground. Hydraulic brakes mandatory on rear axle. Front Brakes are not allowed.
• DRIVE TRAIN: Is open to live axle, belt or chain drive custom gearboxes or transaxles. Chain guards must be made of at least 1/8” thick material. Centrifugal clutches are permitted STAR CLUTCHES ONLY. In instances where custom drive train may be hazardous to driver (exposed) protective shields must be installed. ATV drive trains and suspensions are not permitted.
• STEERING any improvements or modifications to steering are allowed and recommended. NO stock steering allowed. All steering components must be double nutted or drilled and safety wired for maximum safety. Padding must be added to the center of the steering wheel and Quick release hub locks Must be drilled and pinned.
• TIRES: MUST be Lawn mower Tires ONLY!!
• WHEELS: NO STOCK WHEELS must be made of metal. While smaller rim sizes are permitted, 6" front wheels and 8" rear maximum size only. All wheels must have wheel retention in the form of castle nut with cotter pins, lock collars, and snap rings, thru bolts or center bolts. Cotter pins alone are not sufficient.
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George Herrin #6
3 time USLMRA National Champion
8 time ARMA National Champion
Herrin Mower Sports Racing Team/Fat Boyz Racing
Hohenwald Tn. 38462
wk... 615-446-6807
http://btmra.smfforfree2.com
http://www.eccarburetors.com/

Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly
proclaiming . . "WOW ---What a Ride



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