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Junior 1 Cage Kart AKRA Box Stock
Purple restrictor and Stock 4hp engines
NOTE: 4HP engines will not be allowed in 2010
Minimum weight #250
6 to 8 years old
Trophies and championship points will be awarded.
Parents keep in mind that this is a beginner
class, 1st, 2nd and 3rd place points winner for the season must move to
an upper class.
Drivers
- Maximum 8
yrs old. Drivers over 8 may compete with track official approval.
- Must have
serviceable fire extinguisher in pit.
Frames
- Fun-kart,
custom built or production frames allowed. (Quarter Midget cars OK)
- No aluminum
or titanium material.
- Engine can
be mounted behind or beside the seat (sidewinders OK)
Body
- Bodies are
optional.
- Fiberglass,
aluminum, plastic or steel bodies.
- 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
- Front and
rear bumpers required of Max. 1" O.D. tubing. Not to exceed outside
tread width of tires.
- Bumpers and
nerf bars must have rounded or capped ends. No sharp edges.
Roll cage and seat
belts
- Minimum
4-point cage with 3" head clearance. NO conduit cages allowed.
- Cage must
be constructed of steel no smaller than 3/4" O.D.
- Roll cage
must be securely welded or bolted to frame.
- Minimum
4-point seat belt. Aluminum racing seat is recommended.
- Right side
cage net, right side helmet support or a helmet restraint is
mandatory.
Wheels and tires
- Any wheel
or tire allowed.
- Grooving
allowed.
Brakes
- Brakes must
be capable of stopping kart within a safe distance.
Drive train
- Live axle
only.
- Chain guard
required.
- Centrifugal
drum clutch only
Engine
- There will
be a $200.00 claim rule on all engines
- AKRA
Box Stock with purple.500 inch intake restrictor or OEM box stock
4HP engines only.
(NOTE: 4HP engines will not be allowed in 2010)
- Box stock
only no modification can be made to the 4hp engines except
header/muffler and air filter.
- See AKRA
Tech Procedures below for complete engine rules.
Fuel
- 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.
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) |
