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PENNS CREEK RACEWAY PARK
CLONE CLASS STRUCTURE
ROOKIE CLONE* Age 8 to 10 years 265 lbs. - 87 Octane Gas Only Approved engine 6.5 OHV only, with .400 inch maximum intake restrictor, no steering fairing allowed, maximum nose height 14 inches from ground level to top of nose, and Factory Stock exhaust required. Stamped steel drum shoe type clutches only.
ROOKIE CAGE CLONE* Age 8 to 10 years 280 lbs. - 87 Octane Gas Only Approved engine 6.5 OHV only, with .400 inch maximum intake restrictor, no steering fairing allowed, maximum nose height 14 inches from ground level to top of nose, and Factory Stock exhaust required. Stamped steel drum shoe type clutches only.
JUNIOR CLONE* Age 10 to 15 years 300 lbs. - 87 Octane Gas Only Approved engine 6.5 OHV only, with .500 inch maximum intake restrictor, and Factory Stock exhaust required. Stamped steel drum shoe type clutches only.
JUNIOR CAGE CLONE* Age 10 to 15 years 300 lbs. - 87 Octane Gas Only Approved engine 6.5 OHV only, with .500 inch maximum intake restrictor, and Factory Stock exhaust required. Stamped steel drum shoe type clutches only.
SENIOR CLONE* Age 14 years & up 375 lbs. 87 Octane Gas Only Approved engine OHV only, with Factory Stock exhaust required. Stamped steel drum shoe type clutches only.
SENIOR CAGE CLONE* Age 14 years & up 400 lbs.- 87 Octane Gas Only Approved engine 6.5 OHV only, with Factory Stock exhaust required. Stamped steel drum shoe type clutches only.
SUPER BOX 6.5 OHV, HEAVY Age 15 years & up 375 lbs. 87 Octane Gas Only Approved Engine: Box Stock Project 6.5 OHV modified only according to AKRA Super Box 6.5 OHV Engine Spec. Stamped steel drum, shoe-type clutches only with any gear. AKRA approved exhaust per Super Box 6.5 OHV Engine Spec. required.
CLONE ENGINE SPECS
ENGINE SPECIFIC TECH SHEET FOR: BOX STOCK PROJECT 6.5 OVH
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. |