RIVERSIDE RACEWAY PARK CLONE RULES FOR
2010
Revised as of MARCH 31, 2010
ENGINE
SPECIFIC TECH SHEET FOR: BOX STOCK PROJECT 6.5 OHV
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 known Box Stock part. When
performing a comparison check a + /-
.005” tolerance will be used unless otherwise indicated. Engine will be teched as raced. Engine must
be one of the Blue or Yellow Harbor Freight motors. No Honda GX series motors
CLAIMER
RULE: There will be a $225
claimer rule in place for this engine. You must finish the race in the box
stock class to purchase the winners engine.
– If you finish 4th, for example, & you want to purchase
the winners’ engine, you must also purchase the 3rd & 2nd
place engines as well. Claimed engine does not include the clutch, chain guard,
throttle kit, header pipe/muffler, air filter adaptor and air filter, top
plate, fuel pump, and valve cover with pulse fitting. The seller must supply a
stock valve cover to the claimer. Any claim or protest must be filed in the
scale area within 5 minutes after race is completed. $100 to protest, $50 to
accept. Once protest monies are given
to track official you must complete the
protest. No exceptions.
Refusing to
accept the claimer (1st Offense) will result in immediate
disqualification of competitor along
with forfeiture of
any points earned
to date in the class. ( 2nd
Offense), driver and/or kart owner will
not be allowed to compete any longer in that class.
There will
also be a $25 tech in place that will consist of lift check, spring check and
carb check. This tech will be performed on the grid impound area after the
feature race. See below for additional tech options.
If karter
denies tech, he/she will be disqualified
Any arguing with track official, use of inappropriate language, or
causing a disturbance will result in an immediate suspension of not less than 2
weeks and a $500 dollar fine paid to the track before returning. A disturbance
includes pushing or bodily contact with a track official or competitor.
COMBUSTION
CHAMBER VOLUME: 27.5 cubic centimeters 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
45º valve face and 30º top relief. Stock head bolts only, must have four. Head gasket
may be after market; must be of stock configuration. No copper or aluminum
gaskets allowed. Any stock
configuration gasket allowed; no other sealer permitted.
BORE
AND STROKE: Stock
cylinder bore is 2.685” max. Stroke is
2.123” +/- .005”.
CARBURETOR :
Huayi OR RUI*ING model carb only. Carb
to intake sealer must be gasket only,
no other sealer allowed. Choke is
optional. Choke bore: .810 NoGo. Stock
emulsion tube only without modification.
Venturi: .615 NoGo. Rear carb bore: .751 NoGo. Main fuel jet: .042 NoGo.
Small Fuel jet: .019 NoGo. Stock
air cleaner assembly or optional aftermarket airhorn/adapter and “Clamp On” air
filter.
CARBURETOR/FUEL TANK
REQUIREMENTS: Floor Mounted fuel tank or stock tank (optional). Pulse type fuel pump allowed. Fuel pump must be pulsed from either the
side cover, valve cover, or block. You may install a flat metal plate or equivalent
support in the original tank location for the purpose of mounting the throttle
linkage and fuel pump. Pump gas only,
87-93 octane. No racing fuel or power additives. Gas will be teched with hydrometer at end of race. We reserve the
right to send any suspicious fuel sample to the lab for further testing. No pay
out will be made until the lab result is known.
VALVE TRAIN:
Stock valve cover only with any stock configuration gasket. Factory stock
rocker arms, (no modified ,extra ratio
arms allowed). Factory stock push rods only. Stock valves only, 45º degree angle
only (both valves), no modifications
allowed. Single wire valve springs:
Dyno Cams white stripe valve spring, part number DCS-CL1 or equivalent.
Valve spring must test at 18 lbs. max at .900 installation height. Wire diameter.: .099 + .005 max.
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, no advance timing allowed.
PISTON & RINGS:
Must be unaltered Box Stock only. No
machining of piston and rings allowed.
CONNECTING ROD: Box Stock rod only. No billet rods. No machining of any type allowed. Stock rod
bolts only.
CRANKSHAFT
REQUIREMENTS: 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
REQUREMENTS: Stock as cast camshaft only, must still have
compression release functional.
Intake lift on
cam .225” max taken at the pushrod.
Intake lift at
the valve .238” max taken on valve spring retainer with zero lash.
Exhaust lift
on cam .232” max taken at the pushrod.
Exhaust Lift
at the valve .242” max taken on valve spring retainer with zero lash.
Cam
Profile (+/-3 degrees)
Intake
050 Lift 8
½ degrees ATDC
.100 Lift
26 degrees ATDC
.150 Lift
47 degrees ATDC
.200 Lift
75 degrees ATDC
Max lift taken
at pushrod .225
.200 Lift
32 degrees BBDC
.150 Lift 4
degrees BBDC
.100 Lift
16 degrees ABDC
.050 Lift 34
degrees ABDC
.010 Lift 72
degrees ABDC
Exhaust
.010 Lift
76 degrees BBDC
.050 Lift 28
degrees BBDC
.100 Lift
11 degrees BBDC
.150 Lift
8 degrees ABDC
.200 Lift 33
degrees ABDC
Max Lift taken
at pushrod .232
.200 Lift 65
degrees BTDC
.150 Lift 37
degrees BTDC
.100 Lift 17
degrees BTDC
.050 Lift
0 TDC
.010 Lift 40
degrees ATDC
Special note.
Valve guide wear can give false valve lift readings when checking off the front
of the valve spring retainer. It is advised to take readings at several points around the retainer (back, and both
sides) if wear is suspected of giving a false, unfavorable reading.
BLOCK
REQUIREMENTS: Block must remain stock as produced. Stub for
governor may be removed and hole plugged.
No machining of block allowed. Block may be honed when installing new
piston rings. Must use stock piston. Welding to the block shall be for rod
damage repair only and may not constitute a functional modification. Deck Height: .000.
HEADER
& MUFFLER REQUIREMENTS: Any single stage, one piece header made of steel tubing
allowed. All headers must be wrapped
for safety. WKA muffler (stock style
only) NO MODS, no limited style “open hole” muffler allowed. Muffler must be
clamped and strapped with positive fasteners. No welding permitted.
CLUTCH/GEAR
RULE: Open Clutch (any manufacturer). OPTIONAL-- RUN 19 tooth clutch sprocket
and 72 tooth rear sprocket---OR 18 TOOTH/68 TOOTH REAR. (19/72 OR 18/68). MARCH 31, 2010.
TIRE
RULE: BURRIS B33A ONLY. 42 DUROMETER MINIMUM.
SEALED MOTORS:
We will have a sealed motor option that will cost an extra $30. Must contact
tech official, who will check engine for any modifications. If tech is legal, the motor will be sealed
at head, block, and side cover. With regard to sealed motors from other
tracks: Riverside Raceway tech will
still apply as if motor has never been sealed, to include the $225 claimer
rule.
$25 TECH. (On track at impound area). Valve springs,
carb check, rocker arm check and lift check. Tech official gets the $25.
$50 TECH. Entire motor tech, block, head, cam, crank, piston, rod, and carb.
(This option applies to making an appointment with the tech official during the
week, prior to race night, or leaving your motor with the tech official after
the race, to be picked up at a mutually agreeable time, in order to determine compliance
with track rules) Tech official gets the $50.
$30 SEALED MOTOR OPTION. Inspection of new motor
(unopened box) in the tech room. (This option not available on race night). You
must make an appointment with the tech official. Tech official will seal the
block, head and side cover. Includes
seals and new side cover gasket. Removal of governor shaft and installation of
governor shaft hole plug extra.
RIVERSIDE RACEWAY (STOCK APPEARING) BLUE OR YELLOW CLONE
STOCK APPEARING Blue or Yellow
6.5 OHV Single cylinder 2 valve 4cycle motor.
Motor
and carburetor may be modified internally. Must run billet rod and flywheel.
After market header and RLV muffler. Methanol may be used as fuel.
ANY AND ALL RULES SUBJECT TO
CHANGE AT ANYTIME