Midwest Lawnmower Racing Association

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SUPER MODIFIED CLASS RULES 2007

As fast as you can make it!

 

1.) Engines:

               a. 5 to 22 horsepower single or twin cylinder. Up to 44ci.

              b. Vertical or Horizontal shaft.

               c. Must be lawn mower type engine.

               d. May be internally and externally modified.

               e. Must be 4-cycle engine

               f. Exhaust must route downward or to the side of the mower.

2.) Transmission/Drive-line:

               a. Driveline choice is open. (Gearboxes, centrifugal clutches, torque converter clutches, direct drives, solid rear axles.)

3.) Body and Frame:

               a. Must have a lawn mower frame. If stock frame is inadequate for racing, it may be reinforced or a new one built from steel of the same dimensions and style. No aluminum frames.

              b. Wheel base may be no longer than 60 inches (that's the length from axle to axle.)

              c. Width may be no wider than 42 inches (that's outside tire to outside tire distance.)

               d. Body must have lawnmower style hood and fenders. May be modified to fit frame, Hood must lock down in place securely.

4.) Starters:

               a. Electric or pull start only. No hand held gear drive starters, (like on go-karts and dragsters.)

5.) Gas tanks and fuel systems: Gas tanks must be securely mounted and reasonably protected. (No nitrous oxide allowed.) In line fuel shut off valve mandatory. No fueling a running engine.

6.) Throttles: Any type throttle may be used, twist grip, thumb throttle, squeeze grip, or foot pedal. Must operate freely and have an operable return spring. No fixed throttles.

7.) Safety Kill Switch: Must have a breakaway type, ( Tether type switch is mandatory.) For example types found on boats, wave runners, quad runners. The hook-up cord may be no longer than 30 inches or it may not reach no further than the back of the drivers seat.

8.) Wheels and tires: Any style wheels may be used. They must be mounted securely to the axles, and you must use turf style tires. (No go-kart tires are allowed.) Tubes must be used in front tires.

9.) Brakes: Mandatory, (Must be upgraded from stock braking system.)

10.) Suspension: No shocks or springs are allowed. Steering arms and tie-rod ends must be 3/8 inch diameter minimum. And you must use hime joints or large type ball joints.

11.) Bumpers/ Safety bars/ Mowing decks: Front bumpers are allowed, May not exceed the front width of the tires. Rear bumpers must not exceed the rear width of the tires. Running boards or nerf bars are highly recommended, Cannot exceed the width of the tires. Mowing decks may be used in place of running boards or nerf bars, but must be securely fastened to the frame of the mower. An outside barrier on the running boards or mowing deck to keep your feet from slipping off is highly recommended, and will help control your body weight while cornering.