CMK SPEEDWAY    Engine and Weight Rules 2009
For all plate and stock classes – WKA guidelines apply. Silicone – non tech item. Carb- 2 ports have to be there there            but are a non tech item. You can use a Weisco piston (1977& 1978) for all Stock and Hillbilly Classes.All plate and stock       classes – mandatory muffler. All plate classes mandatory full bumper and chest protector.
Class - (Alternate Classes)Age LimitWeight
Novice(1st year only)(5-8 year olds)N/A

Purple Plate (5-8 year olds)250 lbs
Blue Plate (9-11 year olds) 265 lbs
Gold Plate (12-15 year olds) 300 lbs
JR Unrestricted(15 Max age w/Discretion)300 lbs
Stock Lite (15 - up)325 lbs
Stock Heavy (15 - up)375 lbs
Adult Crate Class 350 lbs was 375 lbs.
Hillbilly Extreme(WKA animal/super box stock) 350 lbs
ProStock (15-up)340 lbs
Limited Mod (308 animal with tilly) (15-up)360 lbs
Flathead Extreme 360 lbs
Open/UAS - UAS rules apply(15-up)360 lbs
Refer to: www.bergfeltracing.com/unlimitedallstars.html
30 and over Class(Hillbilly motor)(30-up)350 lbs

Crates w/pipe and air filter kit will run with stocklite, stockheavy and jr. unrestricted on gas
Gas only on crate motors - any clutch (this includes super bow stock)
Weight determined by track scales - no tolerance
For Special events and money races the restrictor plate and age group may apply.
No fuel additives (this includes top lube) 100% methanol only NO NITRO


                                                      Box Stock Clone
  AKRA rules apply. Pipe and air filter kit can be used.
  APS - 6931 Air filter, JC Specialty 106931 Air filter or ARC 6931 Air Filter.
  You may drill high and low on carburetor and adjust timing.
  Tank is optional, any clutch.
  GAS ONLY!
                                                     Super Box Stock
  AKRA rules apply.
  Pipe - ARC # DJ1137, APS # RLY5438C or JC Specialty # 131137.

  Super Box Stock Kit - ARC # DJ1031
  You may drill high and low on carburetor and adjust timing.
  Tank is optional, any clutch.
  GAS ONLY!

                                                   ProStock Animal –
  308 cam dual valve spring kit – these are the only changes that can be made
  Stock rod #s 6249, 6250, 6251 can be run with a 308 cam
  Combined kart/driver weight 340lbs
  If it isn’t listed here you cannot modify it or run it!

                                                 <Hillbilly>   Extreme STOCK
  Engine must start as a stock flathead 5hp Briggs and Stratton. Blocks may be patched or welded to fix holes and cracks.
  Blocks may be decked. Any popup is allowed.
  Top of block may be modified. (example - remove eyebrows)
  Block can be ported and polished. No adding of any material to the ports.
  Must use stock style carb. and tank combo (no fun carb). Carb may be machined to improve flow. No billet aftermarket           carbs. No newer ventri style carbs.
  No welding except to plug OEM choke holes. Products like JB Weld can be used to fix                                                         choke holes on outside of carb. It cannot
  Be used to build up a carb to be bored bigger or used to enhance performance. CRACKS and     PLUGGING holes ONLY!
  Air filter adapters NON-TECH.
  Any stock type Briggs ignition coils (stock appearing). Air vane can be removed.
  Connecting rod has to be stock length. Can run Billet like 3.870" or 3.875" ARCrods.
  Piston has to be stock Briggs Raptor or Weisco (1977 & 1978) allowed.
  Any cam with a max lift of .233" is allowed. This is running lift. Checked as ran. Just pull head and put dial indicator on valve
  and measure.
  Briggs 5hp OEM stock valves only . Valves may have multiple angles, stock seats but may be modified, any valve
  springs are allowed, dual springs are OK. Aftermarket breather is allowed. Stock or single plate breather only. No ARC type    breathers.
  Billet lifters are allowed (extended lifters are OK)
  Stock Briggs cranks only (2.4375" +/- .010) stock stroke.
  Max overbore will be .035 + .010 does not mean .040" pistons are ok!
  Head is stock appearing. May be relieved to make clearance for valves. Must start with Briggs stock head. No repositioning     of spark plug hole.
  Lifter bores may be welded for strength, and cut for cam clearance.
  Flywheel must be Stock (steel ) or (billet aluminum ARC part# 6608) 5hp flywheel. NO machining or rebalancing at all. OEM   Unaltered ONLY!
  Any header is allowed.
  Fuel is Methanol Only. No pressurized fuel systems!
  Any clutch is allowed.
  Combined kart/driver min. weight 350lbs.
  If it isn't listed here you cannot modify it or run it!
                                             ProStock Engine Rules Flathead
Engine must start as a stock flathead 5hp Briggs and Stratton. Blocks may be patched or welded to fix holes.
Block may be decked. Any popup is allowed.
Top of block may be modified. (example - remove eyebrows)
Block can be ported and polished. No adding of any material to the ports.
Must use stock style carb. and tank combo (no fun carb). Carb may be machined to improve flow. No billet aftermarket           carbs. No newer ventri style carbs. No welding except to plug OEM choke holes. Products like JB Weld can be used to fix      choke holes on outside of carb. MAX bore .715". It cannot be used to
build up a carb to be bored bigger or used to enhance performance. CRACKS and PLUGGING holes ONLY!
Air filter adapters NON TECH.
Any stock type Briggs ignition coils. (stock appearing) Air vane can be removed
Connecting rod and piston is non tech item
Any cam with a max lift of .316" is allowed. No roller type cams. This is total lift with death valves or shines under the valves    for zero lash and dial indicator zeroed at TDC.
Oversized valves and seats allowed, any valve springs are allowed, dual springs are OK. Aftermarket breather allowed. Stock   or single plate breather only. No
ARC breathers.
Billet lifters allowed. No roller type lifters.
Stock Briggs crank only (2.4375" +/- .010"). May be heat treated and relieved for max cam lobes to clear.
Max overbore will be .060 + .010".
Head is stock appearing. May be relieved to make clearance for valves. Must be Briggs stock head. No repositioning of spark  plug hole.
Lifter bores may b welded for strength and cut for cam lift clearance
Flywheel must be stock 5hp flywheel. No machining at all. May have rare earth magnets installed or billet aluminum ARC        part# 6608, Clements flywheel
part # BAFWL and # FWSLTD, JR Racecar flywheel part # 555-3284, or United machine and Fabrication part # 1001.
Any header is allowed.
Fuel is methanol (only) No pressurized fuel systems!
Any clutch is allowed.
Combined kart/driver weight 340lbs.
                                     If it isn't listed here you cannot modify it or run it!
  Will run any other class with 5 or more karts

ALL KARTS WILL RACE