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Sr Champ cage kart AKRA Box Stock
Minimum weight #375
Drivers 16 and up
Purse payout and championship points will be awarded
To find engines and parts for this class check with your ARC
dealer.
Drivers
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Minimum age of drivers is 16.
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Must have serviceable fire extinguisher in pit.
Frames
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Custom built or production kart frames allowed. (Quarter
Midget cars OK)
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No aluminum or titanium material.
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Engine can be mounted behind or beside the seat (sidewinders
OK)
Body
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Bodies are mandatory.
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Fiberglass, aluminum, plastic or steel bodies.
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Wings roof or front allowed. Top wing sides must stay within
3” from outer most edge of kart No sharp edges. Top wing
size 3’x3’x 16” sideboard.
Bumpers and nerf bars
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Front and rear bumpers required of Max. 1" O.D. tubing. Not
to exceed outside tread width of tires.
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Bumpers and nerf bars must have rounded or capped ends. No
sharp edges.
Roll cage and seat belts
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Minimum 4-point cage with 3" head clearance. NO conduit
cages allowed.
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Cage must be constructed of steel no smaller than 3/4" O.D.
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Roll cage must be securely welded or bolted to frame.
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Minimum 4-point seat belt. Aluminum racing seat is
recommended.
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Right side cage net, right side helmet support or a helmet
restraint is mandatory.
Wheels and tires
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Any wheel or tire allowed.
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Grooving allowed.
Brakes
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Brakes must be capable of stopping kart within a safe
distance.
Drive train
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Live axle only.
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Chain guard required.
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Stamped steel drum shoe type clutches only.
Engine
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There will be a $200.00 engine claim rule on the AKRA Box
Stock.
Fuel
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Fuel is restricted to gasoline only 87% octane.
DISCLAIMER Reflect
The rules and or regulations set forth herein are designed for
the orderly conduct of racing events and to establish minimum
acceptable requirements for such events. The rules shall govern
all entrants. NO EXPRESS OR IMPLIED WARRANTY OF SAFETY SHALL
RESULT FROM PUBLICATIONS OF OR COMPLIANCE WITH THESE RULES AND
OR REGULATIONS. They are intended as a guide for the conduct of
the sport and are in no way a guarantee against injury or death
to a participant, spectator, or official.
The race director shall be empowered to permit deviations from
any of the specifications, herein, or impose any further
restriction, that in his opinion do not alter the minimum
acceptable requirements. NO EXPRESSED OR IMPLIED WARRANTY OF
SAFETY SHALL RESULT FROM SUCH ALTERATION OF SPECIFICATIONS. Any
interpretation or deviations of these rules is left to the
discretion of the officials. Their discretion is final.
January 1, 2009
Texoma Motor Speedway
Wichita Falls, Texas
To find engines and parts for this class check with your ARC
dealer.
AKRA Tech Procedures:
Description: Single cylinder, 2 valve, OHV 4 cycle
Important Note: All parts must be Box Stock Project factory
production parts unless otherwise specified in this rules
manual. No machining or alteration of parts is allowed unless
specifically noted. All parts will be subject to a comparison to
a know Box Stock part (when performing a comparison check it is
recommended
to use a + /- .005” tolerance). Engine will be teched as raced.
There will also be a $200 claiming rule in place for this
engine. Refusing to accept the claimer will result in immediate
disqualification of competitor along with forfeiture of any
points earned to date in class. Competitor will also not be
allowed to compete any
longer in that class.
Combustion chamber volume: 27.5 cubic centimeter minimum, with
piston at TDC, using prescribed procedure. Cylinder Head
Requirements: Must be OEM casting only. Porting and / or
grinding are not permitted. Valve seats are two angles 45
degrees valve face and 30 degrees top relief. Stock head bolts
only, must have four. Head gasket maybe after market, must be of
stock configuration. No copper or aluminum gaskets allowed.
Stock exhaust system only with no modifications. Any stock
configuration gasket allowed no other sealer. Bore and Stroke:
Stock cylinder bore is 2.685” max. Stroke is 2.123” + / - .005”.
Carburetor requirements: Huayi model carb only. Carb to intake
sealer is gasket only no other sealer allowed.
Choke must be as supplied from factory, but may be fixed to stay
in open position. Choke bore .810” NO-GO. Venturi .615” NO-GO.
Rear carb bore .751” NO-GO. Main fuel jet .028” NO-GO. Stock air
cleaner assembly only. Valve Train: Stock valve cover only with
any stock configuration gasket, no sealer.
Factory stock rocker arms and push rods only. Stock valves only
45 degree angle only both valves, no modifications allowed. Only
Box Stock
valve springs only. Max wire diameter on spring wire is .698”
with a maximum tension of 10.8 lbs. at a height of .850”.
Ignition system: Stock Box Stock system only and must be
unaltered. Kill switch and low oil sensor may be disabled and
removed.
Flywheel: Box Stock flywheel only with plastic fins. No
alterations of any type allowed. Must also run stock flywheel
key.
Piston and Rings: Must be unaltered Box Stock only. No machining
of piston and rings allowed.
Connecting Rod: Stock Box Stock rod only. No machining of any
type allowed. Stock rod bolts only.
Crankshaft Requirements: Stock Box Stock crankshaft required.
Machining, polishing, addition of material or other alteration
of crankshaft is prohibited. Stock factory timing gear mandatory
and must be installed in original location. Crankshaft journal
diameter is 1.180”- 1.175” min.
Camshaft Requirements: Stock as cast camshaft only. Maximum
running lift of .245” checked at valve as run.
Block Requirements: Block must remain stock as produced. Stub
for governor may be removed and hole plugged. No machining of
block allowed. Welding to the block shall be for rod damage
repair only and may not constitute a functional modification.
The Following updates are optional changes as of September 1,
2008
Carburetor/Fuel Tank Requirements: Floor Mounted fuel tank
allowed (stock tank to be removed). Pulse type fuel pump
allowed. Fuel pump must be pulsed from either the crank case or
the valve cover. You may install a flat metal plate in the
original tank location for the purpose of mounting the throttle
linkage and fuel pump. Aftermarket air filter adapter allowed
(max length of 1.375). Main fuel jet may be drilled to a no-go
of .042 inch. Stock emulsion tube must be used and unaltered.
Header and Muffler Requirements: Any single stage, one piece
header made from .750” O.D. steel tubing allowed with the BS
tube style muffler part #89966 or it’s aftermarket
equivalent(ex: rotary power) installed at the end of pipe. The
tube style muffler may either be welded or tread fitted to the
pipe end. The entire exhaust pipe including the muffler is 14”
max length and 10” min length. Any header with flange maybe
used.
Claimer Rule: You must finish the race in the box stock
class to purchase the winners engine for $200 (minus the
clutch/chain guard/throttle kit, header pipe/muffler, air filter
adaptor/air filter, top plate & fuel pump, motor mount and any
other bolt-ons) |
