Box Stock Project (Clone) Rules

Neil Wed Dec 09, 2009 12:09 pm

Section 8 – AKRA Box Stock Project Class Structure

Participant ages are determined as of January 1st.
BOX STOCK SENIOR* Age 15 years & up – 375 lbs. – 87 Octane Gas Only – Approved engine: BS Project 6.5 OHV only, with Factory Stock exhaust required. Stamped steel drum shoe type clutches only. (Tires EL Maxxis or Local Club Tire Rule)
BOX STOCK SR CHAMP* Age 15 years & up – 400 lbs. – 87 Octane Gas Only - Approved engine: BS Project 6.5 OHV only, with Factory Stock exhaust required. Stamped steel drum shoe type clutches only. (Tires EL Maxxis or Local Club Tire Rule)
BOX STOCK JUNIOR 1* Age 8 to 10 years – 265 lbs. – 87 Octane Gas Only - Approved engine: BS Project 6.5 OHV only, with .500 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.
(Tires EL Maxxis or Local Club Tire Rule)
BOX STOCK JUNIOR 11* Age 10 to 12 years – 290 lbs. – 87 Octane Gas Only - Approved engine: BS Project 6.5 OHV only, with .550 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. (Tires EL Maxxis or Local Club Tire Rule)
BOX STOCK JUNIOR 111* Age 12 to 15 years –320 lbs. – 87 Octane Gas Only - Approved engine: BS Project 6.5 OHV only, and Factory Stock exhaust required. Stamped steel drum shoe type clutches only. (Tires EL Maxxis or Local Club Tire Rule)

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 OR RUI*ING 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 .0698” 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.
Max Intake lift on cam .225” taken at the pushrod.
Max Intake lift at the valve .238” Taken on valve spring retainer with zero lash.
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Max Exhaust lift on cam .232” taken at the pushrod.
Max Exhaust Lift at the valve .242” Taken on valve spring retainer with zero lash.
(Additional cam checks will likely be added later)
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 other 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 the 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

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).

The Following updates are mandatory changes as of January 1, 2009
Carburetor/Fuel Tank Requirements: Floor Mounted fuel tank mandatory (stock tank must 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.

Kinsmen Club / Clone rule modifications, September 27, 2009 / December 09, 2009:
1. If it does not state that you can, then it is not legal to do it.
2. Kinsmen Club / Clone tire rules are Bridgestone YHC or YKC. 4.5 x 5” fronts tires mounted on 5” X 130 / 132mm rims, and 6.0 x 5” rear tires mounted on 5” X 180 / 182mm rims. Air or Nitrogen filed at appropriate pressures. Tire doping applied on or in the tires, at or off premises is prohibited.
3. After market carburetors and Blueprinted carburetors are prohibited.
4. 87 octane unleaded, oxygenated, California refinery blended fuel w/ no additives. (This is not race fuel it is California spec. pump gas)
5. Senior Clone class weight is 350 lbs. 2006 and newer chassis must add an additional 15 pounds.
6. WKA/IKF chassis and driver preparation rules will be enforced.

Kinsmen Club / Clone addition to the “Claimer Rule” above.
Claimer must state intention to claim, to track officials with money in hand within 5 minutes of end of the race.
If the "claimed engine" fails tech, or if any engine that is used on competition day, fails tech due to cheating, not only will the engine be confiscated and destroyed, the owner of said engine will be suspended from participating in the next race. A second cheater motor in the same season will result in non-participation for the remainder of the season and loss of all points. An engine claimer waiver is to be signed at each event by all clone class participants. All clone class drivers must complete and sign the Kinsmen Kart Club liability release / membership form, or other club’s form that the Kinsmen Kart Club is competing at. By signing the official Kinsmen Kart Club liability release / membership form, or other club’s form that the Kinsmen Kart Club is competing at. The participant agrees to become familiar with and abide by all rules, specifications and procedures as set forth in this rulebook and prescribed subsequently by the Kinsmen Kart Club, its affiliates, officers or designated representatives.