This Rule Document is intended as a quick reference guide to ages, classes and engine specifications. For more detailed Rules see IKF Rulebook and UAS Rulebook.
Kid Kart Rules are subject to change after testing on the track. Areas of concern are gearing, governor and assigning a class weight.
Kid Kart: 5-8 years of age
Any 6.5hp 4-cycle Harbor Freight Clone including Predetor or Comer 50cc 2-cycle Engine.
6.5hp 4-cycle Harbor Freight Clone
1. Engines must be run as they come out of the box.
2. Stock governor must be stock and in working order.
3. Air filter and sock must be installed as per factory.
4. No alterations to factory flywheel keyway or key.
5. Engine must pass random rpm governor test on the stand w/max. 5500 rpm.
6. Must run factory gas tank.
7. May disconnect vent tube on fuel tank.
8. May disconnect throttle stop screw
9. Chain guard and engine mount are the only aftermarket parts allowed.
10. Must disconnect and tape oil sensor wire.
11. Spec Gears are 13 tooth driver and 66 tooth axle sprocket.
12. Must run max 5” Tread Tires. NO PREP.
13. Fuel: Pump gasoline only.
Comer 50
1. Stock per IKF Sec. 622.50,C50
2. Spec Gears are 10 tooth driver and 89 tooth axle sprocket.
3. Must run max 5” Tread Tires. NO PREP.
4. Fuel: Pump gasoline only.
JR I - 2 cycle: 8-11 years of age
235#, IKF Yamaha KT100S, WA55B or WA55-1 Carburetor,
RLV 4-hole Box Muffler SSX-V, No Direct Drive, gas & oil only.
JR I-4 cycle: 8-11 years of age
235#, IKF 5 hp Briggs Flathead, .425 blue restrictor, methanol only.
235#, IKF Stock Animal, .251 black restrictor, methanol only.
JR II 2 cycle: 12-15 years of age
310#, IKF Yamaha KT100S, .850 Restrictor, RLV Box Muffler YBX, no Direct Drive, gas & oil only
JR II 4 Cycle: 12-15 years of age
300#, IKF Briggs Flathead, Red .500” Restrictor, methanol only.
310#, BNSS F200, 16 mm BNSS Restrictor, gas only.
320#, IKF Stock Animal, .312 Gold Restrictor, methanol only.
Yamaha Light: 15+ years of age
330#, IKF Yamaha KT100S, Race gas & oil only.
Burris Tires ONLY. No Prep at the track. Tire washing is ok.
Yamaha Heavy: 15+ years of age
370#, IKF Yamaha KT100S, Race gas & oil only.
Burris Tires ONLY. No Prep at the track. Tire washing is ok.
CKA Sportsman Open: 12+ years of age
Two Stroke: 100 cc max
• Piston Port: 340# minimum
• Rotary / Reed: 370# minimum
Two Stroke: 116 cc max
• 415# minimum
Four Stroke: 250 cc max
• Overhead valve pushrod: 212 cc max; 340# minimum
• Overhead valve pushrod: 250 cc max; 370# minimum
Single cylinder
Air cooled
Gasoline only
Open tires
No gear box
No MX engines
No rotary / Reed engines after 1998
Chassis and body work must conform to general rules.
Competitors must declare their weight and display it next to their front number in such a manner that the scale person can easily see it before your qualifying attempt or heat whichever is first.
UAS Open: 16+ years of age
See Rules at: www.unlimitedallstars.org/rules.html
SUPER SPORT:
MUST BE A 196-212 CC MOTOR
MIN WEIGHT 360 LBS KART AND DRIVER
THERE WILL BE ONE CLASS WITH 2 DIFFERENT WEIGHTS RUNNING TOGEATHER
SS-360 & SS-400 THESE ARE THE MINIMUM WEIGHT
THE HEAVY SS-400 CLASS ALLOWS THE RACER TO INCREASE THE HORSEPOWER TO OFFSET THE 40 POUNDS
WEIGHT INCREASE AND BE COMPETITIVE WITH THE 360 WEIGHT CLASS. IF I FIND THERE IS TOO MUCH DIFFERENCE
WITH THE SS-400 CLASS AFTER A FEW RACES I WILL CUT BACK EITHER MOTOR MODS OR REQUIRE ADDED WEIGHT TO THE
SS-400 CLASS , THE GOAL TO HAVE LARGER RACERS THE SAME CHANCE AS THE LIGHTER RACERS IN WINNING.
THE SS-360 IS THE LIGHT MODIFIDED CLASS AS FOLLOWS
ANY MOTOR UP TO 212 CC
REV LIMITER & LOW OIL SENSORS MAY BE REMOVED
MAX CAM MAX LIFT 224 DEG & 246.5 DURATION
18 LB VALVE SPRINGS
HEAD MAY BE MILLED & PORTED
MAX CARB 6.25 SIZE VENTURI
ANY ALUMINUM FLYWHEEL (REQUIRED)
ANY FUEL PUMP
ANY AIR CLEANER
SHOE TYPE CLUTCH ONLY
ANY EXHAUST SYSTEM
FLAT TOP PISTON ALLOWED ONLY IN THE HEMI MOTOR 60363
ANY STOCK LENGTH CONNECTING ROD ALLOWED
ALL GASGETS AND FASTENERS ARE NON TECH
ALL OTHER PARTS MUST BE AS SUPPLIED BY THE ENGINE MFG
PUMP GAS ONLY.
FOR THE SS-400 HEAVY MODIFIDED
ANY MOTOR UP TO 224 CC
MAX CAMSHAFT 307 LIFT & 260 DURATION
ALUMINUM FLYWHEEL REQUIRED
SHOE TYPE CLUTCH ONLY
ALL OTHER MOTOR PARTS OPEN
RACE GAS PERMITTED NO EXOTIC ADDITIVES ALLOWED ( NITRO ETC )
GENERAL RULES
EACH KART WILL DISPLAY A STICKER ON THE LEFT SIDE FOR THE WEIGHT CLASS SS-360 OR SS- 400
FOR THE WEIGHT OFFICIAL TO DETERMINE THE MINIMUN WEIGHT FOR THE RACER.
ALL KARTS WILL BE REQUIRED TO SCALE ( IF AVAILABLE ) AFTER EACH HEAT.
FAILURE WILL RESULT IN A DISQUALIFACATION FOR THAT HEAT OR MAIN.
ALL KARTS FIRST TO THIRD IN THE MAIN WILL BE CHECKED FOR CLASS MOTOR RULES AFTER THE RACE
HOWEVER KARTS MAY PRE-TECH BEFORE THE RACES AND HAVE THERE MOTORS SEALED AND WILL NOT BE
REQUIRED TO TECH AFTER THE MAIN.