AP (A-Prepared) Class
USLMRA Mower Specifications:
- Cutting blades must be removed
- 8.5 HP & under
- valve in block, 4 stroke engine
- 34″min. wheelbase
- 4″ min. front wheels
- 6″ min. rear wheels
- min. 4″ ground clearance to frame
- min. 2-1/2″ groound clearance to deck
- must appear stock
- billet flywheel is mandatory
- Refer to USLMRA Racing Rulebook for build specs
IMOW (International Mower of Weeds) Class
USLMRA Mower Specifications:
- Cutting blades must be removed
- full sized lawn tractor
- 17 HP & under – must be stock
- governed engines, 3650 RPM’s max
- highest gear ratio is 8 to 1
- 39″ unaltered wheelbase
- 5″ min. front wheels
- 8″ min. rear wheels
- min. 4″ ground clearance to frame
- min. 2-1/2″ ground clearance to deck
- must appear stock
- Refer to USLMRA Racing Rulebook for build specs
CP (C-Prepared) Class
USLMRA Mower Specifications:
- Cutting blades must be removed
- 20 HP & under
- single-cylinder over head valve and
- two-cylinder valve in block, 4 stroke engines
- 42″min. wheelbase
- 6″ min. front wheels
- 8″ min. rear wheels
- min. 4″ ground clearance to frame
- min. 2-1/2″ groound clearance to deck
- must appear stock
- billet flywheel is mandatory
- Refer to USLMRA Racing Rulebook for build specs
SP (S-Prepared) Class
USLMRA Mower Specifications:
- Cutting blades must be removed
- OVERÂ 8.5 HP
- valve in block, single- cylinder 4 stroke engine
- 39″min. wheelbase
- 5″ min. front wheels
- 8″ min. rear wheels
- min. 4″ ground clearance to frame
- min. 2-1/2″ groound clearance to deck
- must appear stock
- billet flywheel is mandatory
- Refer to USLMRA Racing Rulebook for build specs
BP (B-Prepared) Class
USLMRA Mower Specifications:
- Cutting blades must be removed
- 20 HP & under
- overhead valve, V-twin 4 stroke engine
- 42″min. wheelbase
- 6″ min. front wheels
- 8″ min. rear wheels
- min. 4″ ground clearance to frame
- min. 2-1/2″ groound clearance to deck
- must appear stock
- billet flywheel is mandatory
- Refer to USLMRA Racing Rulebook for build specs
FX (Factory Experimental) Class
USLMRA Mower Specifications:
- Cutting blades must be removed
- Maximum engine displacement (465 cc)
- single-cylinder
- 42″ max. wheelbase
- frame may not exceed 48″
- 10″ max. front wheels
- 10″ max. rear wheels
- min. 4″ ground clearance to frame
- min. 2-1/2″ groound clearance to deck
- must use axle mounted breaks
- billet flywheel is mandatory
- Refer to USLMRA Racing Rulebook for build specs