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2012 RULES ENGINE SPECIFIC TECH SHEET FOR BOX STOCK 6.5 OHV COMBUSTION CHAMBER VOLUME: 26.5 CUBIC CENTIMETER MINIMUM, WITH PISTON AT TDC, USING PRESCRIBED PROCEDURE. THE LIQUID CC CHECK IS THE OFFICIAL CHECK. (IF THE ENGINE FAILS THE CC LIQUID CHECK AT ANY TIME DURING THE TECH PROCEDURE IT MUST BE CALLED ILLEGAL.) BLOCK REQUIREMENTS: STOCK CYLINDER BORE IS 2.685" MAX. STROKE OS 2.123" + .010 OR -.005"NO PISTON POP OUT ALLOWED. MATTING SURFACE FINISH TO BLOCK AND CYLINDER HEAD IS A NO TECH ITEM, SURFACING OF BOTH TO CORRECT GASKET FAILURE AND MEET CC CHECK ALLOWED HOWEVER NO PISTON POP OUT IS ALLOWED. MAY USE 2 SIDE COVER GSKETS OF STOCK CONFIGURATION. 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 FINCTIONAL MODIFICATION. VALVE TRAIN; STOCK VALVE COVER ONLY WITH ANY STOCK CONFIGURATION GASKET, NO SEALER. FACTORY STOCK ROCKER ARMS 1:1 RATIO AND PUSH RODS ONLY. STOCK VALVES ONLY 45 DEGREE ANGLE ONLY ON BOTH VALVES, INTAKE VALVE MAX OD.982"+/-.005", NO MODIFICATIONS ALLOWED. ONLY BOX STOCK VALVE SPRIINGS. (INSTALLED HEIGHT FOR VALVE SPRINGS .815", MUST BE CHECKED BY USING THE .815" SPRING MUST GO GUAGE WITH RETAINER SEAL IN PLACE ON INTAKE AN EXHAUST VALVE IF USED)PRESCRIBED CHECK PROCEDURE AS FOLLOWS- REMOVE VALVE SPRING, RERINSTALL SPRING RETAINER, INSET .815" MUST GO GUAGE IN SPRING LOCATION. GUAE MUST GO IN BOTH LOCATIONS INTAKE AND EXHAUST WITH ANY ALLOWED RETAINERS IN PLACE, AS RACED, DURING CHECK PROCEDURE. MAX WIRE DIAMETER ON SPRING WIRE IS .071" WITH A MAXIMUM TENSION OF 10.8LBS AT A HEIGHT OF .850" LASH CAP ON EXHAUST VALVE ONLY. VALVE STEM SEAL ALLOWED ON INTAKE OND EXHAUST VLAVE, MAXIMUM LIP THICKNESS OF .027" MINIMUM THICKNESS OF INTAKE RETAINER .230" EXHAUST RETAINER .250" BS LIFTERS ONLY NO MODIFICATIONS ALLOWED. 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. BLOWER HOUSING ASSEMBLY: PULL STARTER NON TECH ITEM. CLUTCHES: ATAMPED STEEL DRUM SHOE TYPE CLUTCHES ONLY. NO MACHINED BILLET DRUMS ALLOWED. NO DISC CLUTCHES ALLOWED. CYLINDER HEAD REQUIREMENTS: MUST BE OEM CASTING ONLY. PORTING AND/OR GRINDING ARE NOT PERMITTED. VALVE SEAS ARE TWO ANGLES 45 DEGREES VALVE FACE AND 30 DEGREES TOP RELIEF. INTAKE SEAT MAXIMUM ID.897", ESHAUST SEAT MAXIMUMID .862". OUTSIDE FACE OF VALVE MAY NOT BE BELOW FLOOR OF COMBUSTION CHAMBER(I.E. DON'T SINK THE VALVES). STOCK HEAD BOLTS ONLY, MUST HAVE FOUR. HEAD GASKETS MAYBE AFTERMARKET, MUST BE OF STOCK CONFIGURATION, GASKET THICKMNESS IS A NON TECH ITEM. DEPTH CHECK BETWWEEN THE VLAVES, FRONT TO BACK AND SIDE TO SIDE MAY NOT VARY BY MORE THAN .005" MAX. NO COPPER OR ALUMINUM GASKETS ALLOWED. ANY STOCK CONFIGURATION EXHAUST GASKET ALLOWED, NO OTHER SEALER. 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 OLY(5LBS4OZ MINIMUM) INCLUDING PLASTIC FINS. BSFW-1 STEEL FLYWHEEL ALLOWED ON 1/1/12 AND MANDATORY ON 7/1/12. SAME WEIGHT CHECK AS STOCK FLYWHEEL. NO ALTERATIONS OF ANY TYPE ALLOWED. TIMING AND FLYWHEEL KEY IS NON TECH. CARBURETOR REQUIREMENTS: HUAYI OR RUI*ING MODEL CARB ONLY. CARB TO INTAKE SEALER GASKET ONLY NO OTHER SEALER ALLOWED. CHOKE MUST BE AS SUPPLIED FROM FACTORY, BUT MAY BE FIXED TO STAY IN THE OPEN POSITION. VENTURI.615" NO-GO REAR CARB BORE . 751" NO-GP. MAIN FUEL JET .042" NO-GO. LOWS SPEED IDLE JET IS A NON TECH ITEM STOCK EMULSION TUBE MUST BE USED AND UNALTERED, .066 MAX ID (NO PASS THROUGH). SIDE HOLES IN E-TUBE 4 HOLES MAX IN BOTTOM SECTION AND 20 HOLES MAX IN TOP SECTION. MINIMUM 3-TUBE LENGTH 1.092". HROTLE SHAFT-.115" MINIMUM. BUTTERFLY-.037" MINIMUM. AFTERMARKET AIR FILTER ADAPTER ALLOWED (MAX LENGTH OF 1.375") CRANKSHAFT REQUIREMENTS: STOCK BOX STOCK CRANKSHAFT REQUIRED. MACHINING, POLISHING, ADDITION OF MATERIAL OR OTHER ALTERAITON OF CRANKSHAFT IS PROHIBITED. STOCK FACTORY TIMING GEAR MANDATORY AND MUST BE INSTALLED IN ORIGINAL LOCATION. CRANKSHAFT JOURNAL DIAMETER IS 1.180" MAX-1.168" MIN. CAMSHAFT REQUIREMENTS: STOCK CAMSHAFT CORES ONLY, EZ-SPIN ASSEMBLY MUST REMAIN AS STOCK. CAM LOBE BASE SIRCLE DIAMETER .865" -.005"/+.010" DURATION CHECK FOR INTAKE AND EXHAUST LOBES (TAKEN OFF PUSHROD). INTAKE DURATION OF 219 DEGREES AT .050 LIFT/86 DEGREES AT .200 LIFT. ESHAUST DURATION OF 222 DEGREES AT .050" LIFT/97 DEGREES AT .200" LIFT. MAX INTAKE LIFT ON CAM.225"-MIN.215" LIFT TAKEN AT THE PUSH ROD. MAX INTAKE LIFT AT THE VALVE .238" TAKEN ON THE VALVE SPRING RETAINER WITH ZERO LASH. MAX EXHAUST LIFT ON THE .232"-MIN.222" LIFT TAKEN AT THE PUSHROD. MAX EXHAUST LIFT A THE VALVE .242" TAKEN ON VALVE SPRING RETAINER WITH ZERO LASH.(TO ACHIEVE ZERO VALVE LASH FOR CHECKING RUNNING LIFT, PRELOAD DIAL INDICATOR BY .001") FUEL TANK REQUIREMENTS: FLOOR MOUNTED FUEL TANK MANDATORY(STOCK TANK MUST BE REMOVED) . PULSE TYPE FUEL PUMP ALLOWED. FUEL PUMP REQUIREMENTS: 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. RLV MINI 91 SILENCER REQUIREMENTS: PART #4117 OVERALL LENGTH 5.470" MINIMUM+/-.005"-5.600" MAXIMUM=/-.005" THREADED NIPPLE .685" MAXIMUM ID(ID AS MFG. NO GRINDING, REAMING, OR POLISHING ALOWED). REAR BAFFLE HOLES .1285" MAXIMUM, INNER BAFFLE HOLES.0965" MAXIMUM, SILENCER MUST BE UTILIZED AS PRODUCED, WITH NO MODIFICATIONS OR ALTERATIONS PERMITTED. STRAP OR BRACE REQUIRED TO SILENCER FOR SUPPORT, AND TO INSURE SILENCER DOES NOT TURN AND UNSCRWEW. CLAIM PROCEDURE CLAIM- $350.00 LESS THAN 14 KARTS-2ND AND 3RD PLACE FINISHERS ARE ONLY ELIGIBLE TO CLAIM MORE THAN 14 KARTS- 2ND THRU 5TH PLACE FINISHERS ARE ELIGIBLE TO CLAIM YOU MUST PULL IN TECH AREA ACROSS SCALES, GIVE YOUR MONEY TO THE SCALE PERSON. THIS MUST BE DONE BEFORE THE NEXT FEATURE RACE IS COMPLETED. (DO NOT WAIT UNTIL THE RACES ARE OVER) IF YOU ARE BLACK FLAGGED DURING THE RACE, YOU ARE NOT ELIGIBLE TO CLAIM. YOU CAN ONLY BUY 2 MOTORS PER RACE SEASON. IF THE PERSON BEING CLAIMED DECIDES TO SWAP MOTORS AND THE ONE DOING THE CLAIMING REFUSES TO SWAP, THEN THEY LOSE THEIR POINTS AND PAY FOR THE NIGHT. IMPORTANT NOTE: ANY ATTEMPT TO INCREASE TH RPM'S OF THE BOX STOCK PROJECT, STOCK CLASSES, ENGINE FOR EXAMPLE: STRONGER/NON STOCK VALVE SPRINGS OR DECREASING EXHAUST RESTRICTION FROM STOCK LEVELS) IS STRICTLY PROHIBITED. SHOULD THIS BE ALLOWED OR PERFORMED WILL MANDATE THE USEOF AFTERMARKET BILLET STEEL FLYWHEEL FOR HIGH RPM USE (SUPER BOX) ARC CURRENTLY HAS THESE PARTS IN THEIR PRODUCT LINE) PART#S 6618/6619) AND THEY ARE APPROVED BY AKRA FOR USE, OTHERS MAY BECOME AVAILABLE AS DEMAND INCREASES. UNDER NO CIRCUMSTANCES IS THIS TYPE OF FLYWHEEL ALLOWED IN THE BOX STOCK (STOCK CLASSES), STOCK FLYWHEEL ONLY. NO OTHER ALTERATIONS TO OR FROM STOCK COMPONENTS ARE ALLOWED. IF YOU ARE CAUGHT CHEATING IN THE CLASS YOU ARE DONE IN THE CLASS. EACH CLASS WINNER WILL PULL A CHIP THAT WILL TELL WHAT ITEM WILL BE TECHED. |
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