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Forum Home > General Discussion > Clone Rules as of 4/11/13

Todd Browne
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4-11-13 Clone Rule Updates for WKA West Regional Series

All clone classes in WKA West regional series will follow these specifications;

JR 1 CLONE

Age 7-12. Weight 255 Lbs. Tires 4.5 YLC. Will run .500 purple intake restrictor.

JR 2 CLONE

Age 12-15. Weight 320 Lbs. Tires 4.5 front / 6.0 rear YLC. Will run .550 blue intake restrictor.

SR CLONE

Age 15 and up. Weight 360 Lbs. Tires 4.5 front / 6.0 rear YLC. No restrictor

SR SUMO CLONE

Age 15 and up. Weight 400 Lbs. Tires 4.5 front / 6.0 rear YLC. No restrictor

711 CLONE CLASS ENGINES

Section 711 describe the specifications for clone class engines. These are 6.5 horsepower "Clone"

Engines only. All parts must be factory production parts unless otherwise specified in this manual. No

Machining or alteration of parts permitted unless specifically noted. All parts are subject to be compared to known stock parts + or - .005". No reading between the lines. If it is not in the rules, it must remain stock. Additional rules may be added at any time as WKA West moves forward with this program

UNLESS OTHERWISE STATED ENGINE WILL BE TECHED AS RACED.

711.1 CLUTCH

All classes must run a shoe type clutch. Drum may be stamped or billet steel. No cooling

Fins may be either machined into drum or added on. Disc clutches are not allowed.

711.2 FUEL TANK

Must be floor mounted

711.3 CARBURETOR

Carburetor requirements: Huayi OR RUI*ING 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. Low

speed jet size is non tech. Low speed jet may not be drilled through to outside air. 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 E-Tube length 1.092”.

Throttle shaft - .115” minimum. Butterfly - .037” minimum.

711.4 FUEL PUMP

Any pulse type pump is allowed. Fuel pump must be pulsed from the valve cover.

711.5 AIR FILTER

Aftermarket air filter ok, aftermarket air filter adapter allowed (max length of 1.375). Loss of air filter during a race does not

constitute a reason for disqualification

710.6 BLOCK

Block must remain stock, Maximum bore is 2.685. No piston pops up allowed. Mating surfaces of block is

Non tech. Surfacing to correct gasket failure and meet cc check is allowed. No welding on block

711.7 CYLINDER HEAD

No porting, grinding or modification. Valve seats may have three angles: single 45 degree valve face and single

30 degree top,and 60 degree botton. Intake seat 0.897" maximum. Exhaust seat 0.862 maximum. Surfacing to correct gasket

failure and meet cc check is allowed. No welding on head. Head gasket must be stock configuration, 0.08 min to .040 max. Sealer may be used

711.7.1 COMBUSTION CHAMBER VOLUME

Minimum volume 26.5cc as measured through spark plug hole using the LAD tool with head on

the engine. See Section 504 for instructions how to use the LAD tool to check cylinder head volume.

711.8 VALVE TRAIN

Valve train will remain stock. No polishing. No grinding. No alterations. Stock OEM rocker arms only.

Stock valve springs only. Maximum wire diameter is .071". Maximum spring pressures are 10.8 lbs @

height of .850 and 18 lbs @ height of .650". Spring retainer measurements - exhaust 0.250" MIN, intake 0.230" MIN. Intake valve diameter - 0.985" + or - 0.005" with 45 degree angle. Exhaust valve diameter - 0.948" + or - 0.005". Lash cap on exhaust valve only. Seals allowed on intake an exhaust valves. Minumum valve spring installed height is 0.815". Valve spring shims allowed.

711.9 ROD

Stock rod only. Rod may be honed. no other modifications allowed.

711.10 PISTON AND RINGS

Stock piston and rings only.Ring gap may be filed to fit

7

11.11 CRANKSHAFT

Stock crankshaft only;no modifications. Crankshaft journal is 1.180" maximum and 1.168" minimum.

Stroke is 2.123" plus 0.010" or minus 0.010".

711.12 CAMSHAFT

Camshaft must meet these specifications. Maximum running lift on exhaust is 0.242" taken on valve

spring retainer at zero lash. Maximum running lift on intake is 0.238" taken on valve spring retainer with zero lash. Intake lift at pushrod - maximum - 0.225", minimum 0.215. Exhaust lift at pushrod – maximum 0.232", minimum 0.222. Duration check for intake and exhaust lobes. Intake duration of 218.5 degrees at 0.050" lift / 85.5 degrees at 0.200 lift. Exhaust duration of 221.5 degrees at 0.050" lift / 96.5 degrees at 0.200" lift (all checks will allow +2 degrees for wear and gauge and wheel variances.

711.13 FLYWHEEL AND IGNITION

Ignition coil must be stock, but ignition timing is non tech. Coil may be shimmed to align with magnet.

Flywheel must be billet steel, @ 5 lbs 3 ozs. Plastic fins must remain stock. Flywheel key is non

tech.

711.14 HEADER PIPE

Maximum length is 15" and minimum is 10". Header must be single stage maximum 0.750" outside

diameter, 0.635" ID inside measurement. no aftermarket coatings of any type allowed. 1 header gasket

only. Sealer is permitted.

711.15 MUFFLER

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 Allowed). 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 unscrew.

711.16 STARTER

Pull starter must be present and remain stock. Pull starter may be rotated for better cranking angle.

711.17 ENGINE OIL RECOVERY SYSTEM, FILL AND DRAIN PLUG

Hose ran from valve cover breather hole, must be run to a catch can. Oil fill and drain plugs must be

safety wired along with bottom two side cover bolts.

711.18 OIL SENSOR

Oil sensor may be removed.

711.19 GOVERNER

Governer and governer components are non tech.

11.20 SIDE COVER GASKETS

2 gaskets maximum.

711.21 AFTER MARKET COATINGS

No aftermarket coatings of any kind are allowed except on blower housing shroud.

711.21 SHEET METAL

All sheet metal must be used as supplied with engine.

FUEL

Fuel for all clone classes will be pump gas

CLAIMER

Claimed motor will consist of complete motor less flywheel as supplied from BSP. Amount of claim is $300 cash only and could be

subject to change with the market value, CLAIM CONSENT forms must be filled out and signed with entry form in order to recieve series points.

CLAIM form will be filled out, signed and put in a sealed envolope along with $300 cash by RACER, then given to Tech Official prior to start of Main Event

After checkerd flag, envelopes will be opened and handed out acordingly. Claimer must be a DRIVER in same class, Only one claim per season can be made by a competitor, Claimed engine will be subject to TECH done on that day, If CLAIMED motor is found to be ILLEGAL or DAMAGED in race, the CLAIMER will be given option to proceed with or withdraw thier claim

May 6, 2013 at 4:29 PM Flag Quote & Reply

vincent
Member
Posts: 1

Do you have complete guidelist for this, I wanted to have this done accrodingly.

--

"needs sports apparel? check Shoppingformen.com.au"

February 4, 2014 at 10:30 AM Flag Quote & Reply

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