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AP (A-Prepared) Class

USLMRA Mower Specifications:

  • Cutting blades must be removed
  • 10.5 HP & under
  • valve in block or OHV, 4 stroke engine
  • 34"min. wheelbase
  • 4" min. front wheels
  • 6" min. rear wheels
  • min. 4" ground clearance to frame
  • min. 2-1/2" ground 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 (or 31ci) & 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  OHV or
  • two-cylinder valve in block (opposed twin), 4 stroke engines
  • 42"min. wheelbase
  • 6" min. front wheels
  • 8" min. rear wheels
  • min. 4" ground clearance to frame
  • min. 2-1/2" ground 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
  • OVER 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" ground 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
  • OHV, 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" ground 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" ground clearance to deck
  • must use axle mounted breaks
  • billet flywheel is mandatory
  • Refer to USLMRA Racing Rulebook for build specs

 
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