Clone class Structure and Rules
Participant ages are determined as of January 1st.
Manchester Speedways List of Clone Classes.
New class for 2010- AKRA Box Stock Clone 375*-Age 15 years & up 375 lbs. 87 Octane Gas Only Approved engine: BS Project 6.5 or blue harbor frieght 196 cc. engines
OHV only, . Stamped steel 16th drum shoe type clutches only. (Tires MAXXIS EL's)
Any single stage, one piece header made from .750 O.D. steel tubing allowed with the BS tube style muffler part #89966 or its 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.
THE Following existing CLONE CLASSES may run any kind/type/make of clutch they so choose to use but must abide by the clutch gear rule for proper class. Also Any size diameter, length or amount of stages header they so choose.
STOCK CLONE 375* Age 15 years & up 375 lbs. 17 tooth clutch gear rule, open rear gears, 87 Octane Gas Only
Approved engine: Any color/Generic 196cc. 6.5 OHV only
STOCK CLONE 330* Age 15 years & up 330 lbs. 17 tooth clutch gear rule, open rear gears 87 Octane Gas Only
STOCK CLONE SR CHAMP* Age 15 years & up 400 lbs. 16 tooth clutch gear rule, open rear gears 87 Octane Gas Only -
STOCK JUNIOR CLONE 1* Age 8 to 10 years 265 lbs. 87 Octane Gas Only -
Approved engine: Any color/Generic 196cc. 6.5 OHV only, with .500 inch maximum intake restrictor, no steering fairing allowed , Open clutch/gear rule, open rear gears.
(No Name Brand Engines Honda, etc.) Have been mixing with flatheads and animals for now and seem to be real competetive with each other.
STOCK JUNIOR CLONE 2* Age 10 to 12 years 290 lbs. 87 Octane Gas Only - Approved engine: Any color/Generic 196cc. 6.5 OHV only with .550 inch maximum intake restrictor, no steering fairing allowed , ( No Name Brand Engines Honda, etc.) Open clutch gear rule, open rear gears. Have been mixing with flatheads and animals for now and seem to be real competetive with each other.
STOCK JUNIOR CLONE 3* Age 12 to 15 years 320 lbs. 87 Octane Gas Only -
Approved engine: Any color/Generic 196cc. 6.5 OHV only, (No Name Brand Engines Honda, Briggs. etc.) 17 tooth clutch gear rule, open rear gears.
ENGINE SPECIFIC TECH SHEET FOR: STOCK CLONE 6.5 OVH 196CC.
Carburetor/Fuel Tank Requirements: Floor Mounted fuel tank mandetory (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.
Description: Single cylinder, 2 valve, OHV 196cc. 4 cycle
Important Note: All parts must be Box Stock 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 "stock part" 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.
Claimer Rule: You must finish the race in your entered class to purchase the winners engine for $200 first come first serve Track does retain the right to Claim a Engine or over rule a racers claim, if felt needed for further techincal inspection. (minus the clutch/chain guard/throttle kit, header pipe/muffler, air filter adaptor/air filter, top plate & fuel pump).
Combustion chamber volume: 26.5 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. Venturi .615 NO-GO. Rear carb bore .751 NO-GO. Main fuel jet .042 NO-GO.
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.
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 .0705 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 if engine has these features.
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. Cam lobe base circle diameter .865" -.005/+.010
Duration check for Intake and Exhaust lobes (taken off pushrod). Intake duration of 218.5 degrees at .050 lift/85.5 degrees at .200 lift. Exhaust duration of 221.5 degrees at .050 lift/96.5 degrees at .200 lift. (All checks will allow +2 degrees for wear and gauge variances.)
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.
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 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.
