Coleridge Raceway "Clone Stock Rules" 2010
** These rules regulate 2 classes (Flat Kart Clone and a Champ Kart class) running non sealed engines that can be prepared by anyone or company.......They also offer 4 other clone classes ultilizing a sealed motor program regulated by us (Dover Power / NC Speed)
** Any color / brand of clone allowed. Max 200cc / 6.5 hp. No original Honda parts allowed. Max 93 octane pump gas with no additives. Any oil allowed as long as no combustion enhancements are added. Normal oil checks apply.
**Block must remain stock. Maximum bore is 2.685. Stroke is 2.123 plus or minus .005. Welding for repair only. No modifications allowed. Deck height, no part of piston can come out of top of block. It will be checked with square edge. No removal of carbo allowed before check.
**Piston and rings must remain stock unaltered. Piston must be dished type and only Standard size allowed. All three rings must be present and unaltered (working)
** Stock cast rod as supplied from factory, no honing or hatch grooving allowed.
**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
No Ceramic Bearings allowed. Stock oem only.
** Cylinder Head must remain stock as from factory. Absolutley no machine work with exception of simple valve job seat facing. Valve seats have two angles: single 45* bottom and single 30* top. Head gasket must be stock spring steel type with a min thickness of .009. No sealents allowed.
Valve train will remain stock. No polishing. No grinding. No alterations. Stock 1:1 ratio OEM rocker arms only.
Stock valve springs only. Maximum wire diameter is .0705.
Maximum spring pressure is 10.8 lbs. at an installed height of .850.
No swapping of heads from one brand to another. Lifan/Lifan,
Ducar/Ducar etc.
Valve cover must remain stock, no welding and structural changes. Pulse fitting is allowed for Fuel Pump pulse.
**Combustion chamber volume: 26.5 cubic centimeter minimum, with piston at TDC, using prescribed procedure.
**Camshaft must be stock from factory, no alterations. No aftermarket cams allowed. We have devised a method to check for these cams. Compression release must be intact and working.. Maximum running lift on exhaust is .242 taken on valve spring retainer with zero lash. Maximum running lift on intake is .238 taken on valve spring retainer with zero lash...
Cam lobe base circle diameter .865" -.005”/+.010”
** Flywheel and Ignition Coil: OEM stock/unaltered flywheels and plastic fins only. (no
machining allowed) Flywheel key must remain stock unaltered in stock location...
Plastic fins must be intact and have their full depth. Minimum (bare) flywheel weight is 5.0 lbs..
** Carburetor requirements: Huayi , RuXing or Jing Ke Brand carbs only. No sealers on any gaskets.
Choke must be as supplied from factory, but may be fixed to stay in open position. No machining in carb whats so ever. It will also be teched visually. You may run either the thin paper type air cleaner gasket or the thick, metal / rubberiszed one.
Venturi .615” NO-GO. Front carb bore(butterfly side) .751” NO-GO. Butterfly and throttle shaft as well as screw must remain stock unaltered. (measurements coming and will be enforced without notice)
No tech on hole size in Jet or Emulson Tube (must be the gx200 tube with no modifications on length or position in carb bore.No machine work to the e tube period.). You must run stock float and inlet needle. Fuel can only enter carb bore throught jet and emulson tube.. Also no size rule on Low Speed jet as well. These checks vary from carb to carb and hard to retain a fair playing field..
No sealer allowed on any gaskets. Isolator must remain unaltered and in stock location between carb and head. No external holes can be drilled to enable engine to such air. Normal WD-40 test may be used..
Must be a gasket on both sides of restrictor plates when used. Plates must be installed correctly. ARC is the only legal plates.
Silver .425
Purple .500
Blue .550
**After market air filter adapters are Ok. Maximum length: 1.375.. K&N style filter allowed. Must not create a ram effect.
** Any single line fuel pump allowed. May pulse from valve cover,or crankcase. Max hose id is .250 (1/4"). Max allowed length 8" inches. Recommended that you run a top plate to mount pump to as well as serve as a deflector for possible broken rods.
** Stock Blower Housing and starter. Starter must be complete and in working order. You may use tape to help retain cylinder head temps.
** Oil sensor may be removed. Governor and governor component is non-tech.
** Any throttle linkage allowed.
** Any Spark Plug Allowed .. Plug Connector / Boot must remain stock OEM
** No metal treatments allowed,,ie ceramic, heat barriers, nicasil etc
** Any header is allowed with exception of Loop Pipes. You must run the stock class (round hole type) RLV muffler. Muffler can be clamped or tac welded to end of pipe. Holes in muffler are a tech item and same max size is the same used in WKA for the Briggs. Also no Ceramic Header coatings. Header must be wrapped for drivers protection..
## Additional measurements are coming for ..
1) Min valve diameter
2) Max valve seat id
3) Min head delpt
As long as you follow above rules the measurements will not cause you any problems.. Remember if all else fails we will compare parts to a known stock part. The race track has the right to retain a part in question and have it looked at by other tech inspectors..
$$ CLAIM RULE >>>>>>>> $200.00 (Claimee keeps all bolt ons,, ie chain guard,header,clutch,,top plate and fuel pump,throttle assy,spark plug,air filter and adapter.
Claim guidelines will be published by the track along with protest options..
### Major Safety Warning and Penalty If Caught. ###
Running the aftermarket cam can get these engines into a danger zone. We encourage all racers to keep their RPM's at 6200 and below. Dyno testing has shown that theres no additional power above these rpm's as long as the rest of the engine is in correspondance with the rest of the above rules..
Anyone caught reving Clone engines on the kart stand or under no load will be warned the first time and asked to leave the track on the second occurance. This is for the life of the season.. Coleridge Raceway will not be responsible for any injuries occuring from these Clone engines. The racer assumes all responsibilites.
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