• FB/AB: Alcohol Blown
  Single engine 1425cc maximum. Laydown frame. Mechanically driven supercharger fueled with Alcohol only.
• FB/GI: Gas Injected Turbo
  Turbocharged injected, gasoline only, no alcohol. Single stage of nitrous only, one nitrous solenoid to purge system. One set of nozzles per cylinder.
• FB/GN: Gas Nitrous
  Turbocharged with Nitrous, gasoline only, carburetors only, no injectors. Maximum three stages of nitrous, (single variable stage
  nitrous highly recommended).
• FB/IA: Injected Alcohol Turbo
  Injected Alcohol turbo, no nitrous.
• FB/IN: Injected Nitro
  Injected nitromethane fuel, no boost, no nitrous.
• FB/TA: Turbo Alcohol
  Turbocharged with Alcohol, carburetors only, no injectors, no nitrous.

3. BODY
All FB rear fenders must extend past the rear axle. No gloss painted seats. Seats must have fabric or anti-skid texture. Front fairings must
have clear windscreens. All Funnybikes (4-cylinder) must run a tank shell similar to stock with engine manufacturer‚s logo in large letters.
Front fender, rear fender, headlight or fairing mandatory. All nitrous bikes must have thumb (butterfly) body fasteners; all body fasteners
must be able to be removed by hand without the use of tools.

4. BRAKES
Minimums: Front: dual, 10-inch diameter x 3/16-inch width; single, 11 1/2-inch diameter x 3/16-inch width. Rear; single, 10-inch diameter x
3/16-inch width. All brake lines are to be steel braided.

5. ENGINE
Stock cases permitted; aftermarket cases are highly recommended. Any V-Twin engine using nitromethane fuel engine must utilize cylinder head restraints. (See Prostar Rulebook.) Accepted aftermarket cases, cylinder heads, planetary transmission permitted. Engine must be equipped with an oil blanket or oil catch pan (See Prostar Rulebook.)

6. FRAME
Wheelbase minimum is 74-inches for Funnybikes. Stock cradles (chassis) prohibited. (See Prostar Rulebook.)

7. FUEL SHUT-OFF
All fuel entries must have a pre-loaded fuel shut-off. A lanyard must be connected between the rider and the trigger; the shut-off may be
operated by spring, air, hydraulic or other means accepted by Tech. All entries must have a means of shutting off fuel while the rider is on
bike.

8. FUEL SYSTEMS
Steel braided fuel lines are mandatory on all pump driven fuel systems. Dual cable positive return throttle are mandatory. All non-braided fuel lines must be fastened with a metal clamp, band or fitting (no wire). Be careful not to over tighten.

9. KILL SWITCH
When the lanyard is pulled, ignition, fuel pump and nitrous solenoids must be disarmed. (See Prostar Rulebook.)

10. PROTECTIVE CLOTHING
Nomex underclothing protecting legs is mandatory. Nitro entries must utilize a Nomex helmet sock.

11. QUALIFYING
Riders of Funnybike must hold a Prostar Class 1 license. (See Prostar Rulebook)

12. TIRES AND WHEELS
Front tire must be road race or V-rated. Front wheel must be minimum WM 1 x 16. Minimum tire size width is 11-inches; maximum tire width is 13 inches. Rear wheel utilizing 12-inch or wider tire must have a 3/8-inch minimum thickness spider and bead locks. Non-bead lock wheels permitted if utilizing 11- inch tire with locking screws (See Prostar Rulebook.) All rear tubes must be natural rubber, racing type. For safety, tire width should not exceed rim width by more than two-inches, bead seat to bead seat.

13. WEIGHT
Minimum weight 650 pounds plus rider.

14. WHEELIE BARS
May not exceed the wheelbase of bike and must be sufficiently cross-braced to prevent side whip.