Racing Divisions and Noted Rules of the ARMA

Before participating in any lawn mower racing event,be valve in block, single cylinder 4 stroke, but can be
you have to choose your racing division. The Americanover 8.5HP
Racing Mower Association has 7 divisions, ranging•    A minimum and unaltered chassis of 39”.
from novice to expert.•    Front wheels are 5” minimum
ARMA – Kids Stock, Adult Stock•    Rear wheels are 6” minimum and 8”
This is the novice level using stock lawn mowers. Themaximum.
governor should not be removed, the wheelbase is•    No mid engine frames allowed in this division.
stock, and the front and rear rims are original. In short,ARMA – Mod X
just remove the blades and ride it to the finish line. Now we are getting to the advanced divisions.
It’s a great “beginners” division.•    You get to use a more advanced single
ARMA – Kids Super Stock, Adult Super StockOHV and Twin Opposed VIB with under 20HP.
A little quicker ad a little slicker, but still considered entry•    A minimum wheelbase of 39” for the
level lawn mower racing. You will be able to modify achassis of you racing mower.
few things to your racing mower.•    Still no mid engine frames.
•    A governed engine is required, but it can be•    5” minimum for the front wheels and
3650RPM, single cylinder OHV or VIB no more than6” to 8” for the rear wheels.
465cc and 15HP.ARMA – Super Sportsman
•    Full size mowers with a wheelbase ofJust by the name of it, you’ll know that this division
39”is something special. This is where you’ll see the
•    Front wheel should be 6” with tiresfast and the furious of lawn mower racing.
ranging from 13” to 15”•    Powerful all overhead valve, 2 cylinder, 4
•    Rear wheels should be 8” with 16”stroke, and up to 25HP engines are used. Try mowing
tires.your lawn with this baby.
•    Tire pressure up to 15 PSI.•    A wheelbase of 42” for the chassis
•    Air cleaner, air filter, and an open exhaust•    Stock frames
are allowed.•    6” minimum for the front wheels and
•    The frame and the inside of the rims can be6” to 8” for the rear wheels.
reinforced for added durability.ARMA – Pro X
•    The shift mechanism should be original withThis is where the best of the best hang out. It is the
a maximum gear ratio of 8-1.dream of every lawn mower racing enthusiast to
•    The body must be stock complete withcompete in this division. Ever seen a racing mower dig
factory deck.dirt and drift on corners?
•    Spindles in front must be minimum 5/8”.•    Single cylinder and 4 stroke engines with no
ARMA – Mini Sportsmanmax on HP.
Now it’s getting exciting. This is a lawn mower•    Mid engine frames are allowed.
racing division for those who want to build their own•    A maximum chassis of 42”.
racing mower from scratch.•    45” maximum for pan style frames.
•    There are no restrictions on internal engine•    You can shorten the wheelbase to up to
modifications. (Sweet!)37”.
•    Engines should be 4 stroke, valve in block,•    Front and rear wheels are 4” to 8”
and not greater than 8.5HP and 19 cubic inches.respectively.
(You’ll be eating dust if you use an inferior engine.)•    You may use kart tires, as well as add
•    The chassis should have a minimumstagger. But, no offsetting the wheels.
wheelbase of 34”•    No round tubing and chrome molly tubing
•    The front and rear wheels have minimumsallowed.
of 4” and 6” respectively.Those are the 7 lawn mower racing divisions under
ARMA – Sportsmanthe American Racing Mower Association. If you are
This division is for those who have a little lawn mowernew to the sport and haven’t ridden a racing
racing experience and a few racing mower stories.mower yet, you might want to start out in the novice
•    As with the Mini-Sportsman, engines shoulddivisions and work your way up to the Pro X division.