Rules & Class

2025 Ashway Speedway
(Ages, weight & Rules)

1. Future Stars
○ Ages 5–8; 250 lbs; Red Plate (.375 restrictor plate); Approved Engines: AKRA/NKA 6.5 clone engine; 16/65 Gear Rule; 34.5 max RR tire; Open Clutch; No steering fairing; Max nose height 14” from ground level to top of nose; AKRA approved exhaust; May not run any other class with the exception of Future Ducar/Predator Stars – Flat Kart & Champ

2. Future Ducar Stars
○ Ages 5–8; 250 lbs; Red Plate (.375 restrictor plate) Approved Engines: DynoCams Ducar 212 (See Ducar Rules) & Harbor Freight Predator 212 (See Ashway 2025 Predator Rules); Both Engines must utilize a RPM Rev limiting Coil (part # 212-1260R); Tank can be removed and fuel pump/top plate added; Spec Pipe 212 Ducar and 212 RLV muffler option on both; Any Steel Disc or Drum Clutch (NO TITANIUM) ; 16/65 gear rule; 34.5 max RR tire; No Steering Fairing; Max nose height 14” from ground; Spark Plug Required the unaltered NGK ZFR5F-11 or the stock Spark Plug: LG F7TC; No Machining Allowed; May not run any other class with the exception of Future Stars Flat or Champ

3. Jr. 1 Green Plate
○ Ages 8–10; 270 lbs; Green Plate (.425 restrictor plate); Approved engines AKRA/NKA 6.5 Clone Engine; Max Nose Height 14”; No steering fairing allowed; Open Clutch; Big Pipe

4. Jr. 2 Purple Plate
○ Ages 10–12; 290 lbs; Purple Plate (.500 restrictor plate); Approved engines AKRA/NKA 6.5 Clone Engine; Max Nose Height 14”; No steering fairing allowed; Open Clutch; Big Pipe

5. Jr. 3 Blue Plate
○ Ages 12–15; 320 lbs; Purple Plate (.550 restrictor plate); Approved engines AKRA/NKA 6.5 Clone Engine; Adult Nose and Steering Fairing allowed; Open Clutch; Big Pipe

6. Rookie Ducar
○ Ages 8–11; 290 lbs; Green Plate (.425 restrictor plate); Open Clutch Rule (No Titanium)
Approved Engines: DynoCams Ducar 212 (See Ducar Rules) & Harbor Freight Predator 212 (See Ashway 2025 Predator Rules); Both Engines must utilize a RPM Rev limiting Coil (part # 212-1260R); Tank can be removed and fuel pump/top plate added; Spec Pipe 212 Ducar and 212 RLV muffler option on both; Any Steel Disc or Drum Clutch (NO TITANIUM); 34.5 max RR tire; No Steering Fairing; Max nose height 14” from ground; Spark Plug Required NGK ZFR5F-11 or the stock spark plug: LG F7TC; No Machining Allowed

7. Jr. Ducar
○ Ages 11–15; 320 lbs; Purple Plate (.500 restrictor plate); Open Clutch Rule (No Titanium;
Approved Engines: DynoCams Ducar 212 (See Ducar Rules) & Harbor Freight Predator 212
(See Ashway 2025 Predator Rules); Both Engines must utilize a Rev limiting Coil(part # 212-1260R); Tank can be removed and fuel pump/top plate added; Spec Pipe 212 Ducar and 212 RLV muffler option on both; Any Steel Disc or Drum Clutch (NO TITANIUM); No gear or Tire Rule; Adult Nose and steering fairing allowed; No rear gear smaller than 53;
Spark Plug Required the unaltered NGK ZFR5F-11 or the stock Spark Plug: LG F7TC; No
Machining Allowed

8. Future Stars Champ
○ Ages 5–9; 285 lbs; Red Plate (.375 restrictor plate); Approved Engines: AKRA/NKA 6.5 clone engine; Small Cage Jr. Sportsman Champ; Open Clutch; 16/65 Gear Rule; 34.5 max RR tire; Can not run any other class except for future stars Flat or Ducar Champ

9. Future Stars Ducar Champ
○ Ages 5–8; 285 lbs; Red Plate (.375 restrictor plate) Approved Engines: DynoCams Ducar 212 (See Ducar Rules) & Harbor Freight Predator 212 (See Ashway 2025 Predator Rules); Both engines must utilize a Rev Limiting Coil (part # 212-1260R); Must Remove Fuel Tank and add top plate/fuel pump; Spec Pipe 212 Ducar and 212 RLV muffler option on both; Any Steel Disc or Drum Clutch (NO TITANIUM) ; 16/65 gear rule; 34.5 max RR tire; The unaltered NGK ZFR5F-11 or the stock Spark Plug: LG F7TC; Spark Plug Required the unaltered NGK ZFR5F-11 or the stock Spark Plug: LG F7TC; No Machining Allowed; May not run any other class with the exception of Future Stars Flat or Champ

10. Jr. Sportsman Champ
○ Ages 9–12; 320 lbs; Purple Plate (.500 restrictor plate); Approved engines AKRA/NKA 6.5 Clone Engine; Jr. Sportsman Buggies only (small cage); Open Clutch; Big Pipe

11. Jr. Champ
○ Ages 12–15; 350 lbs; Blue Plate (.550 restrictor plate) Approved engines AKRA/NKA 6.5 Clone Engine; Open Clutch; Big Pipe

12. Jr. Ducar Champ
○ Ages 9–14; 350 lbs; Purple Plate (.500 Restrictor plate) Open Clutch Rule (No Titanium); Approved Engines: DynoCams Ducar 212 (See Ducar Rules) & Harbor Freight Predator 212 (See Ashway 2025 Predator Rules); Both Engines must utilize a Rev limiting Coil (part # 212-1260R); Must Remove Fuel Tank and add top plate/fuel pump; Spec Pipe 212 Ducar and 212 RLV muffler option on both; Any Steel Disc or Drum Clutch (NO TITANIUM); Spark Plug Required the unaltered NGK ZFR5F-11 or the stock Spark Plug: LG F7TC; No Machining Allowed; No rear gear smaller than 53

13. Jr. Yamaha
○ Ages 12–18; 325 lbs; Spec Class

14. Clone 340: Age 15+
○ AKRA or NKA Engine; Open Clutch

15. Clone 385: Age 15+
○ AKRA or NKA Engine; Open Clutch

16. Clone 425: Age 15+
○ AKRA or NKA Engine; Open Clutch
○ 200 lbs minimum driver weight as raced

17. Ducar/Predator 365: Age 15+
○ Approved Engines: DynoCams Ducar 212 (See Ducar Rules) & Harbor Freight Predator 212 (See Ashway 2025 Predator Rules); Fuel pump and top plate; Ducar spec pipe Ducar RLV muffler optional; Both engines utilize Rev Limiting Coil(part # 212-1260R); Open Clutch (NO TITANIUM); Spark Plug Required the unaltered NGK ZFR5F-11 or the stock Spark Plug: LG F7TC; No Machining Allowed; No Rear Gear smaller than 53

18. Ducar/Predator 415: Age 15+
○ Approved Engines: DynoCams Ducar 212 (See Ducar Rules) & Harbor Freight Predator 212 (See Ashway 2025 Predator Rules); Fuel pump and top plate; Ducar spec pipe Ducar RLV muffler optional; Both engines utilize Rev Limiting Coil(part # 212-1260R); Open Clutch (NO TITANIUM); Spark Plug Required the unaltered NGK ZFR5F-11 or the stock Spark Plug: LG F7TC; No Machining Allowed; No Rear Gear smaller than 53; No Driver Max Weight

20. Sr. Champ Clone: Age 15+
○ AKRA or NKA Engine

21. Sr. Champ Ducar: Age 15+
○ Approved Engines: DynoCams Ducar 212 (See Ducar rules) & Harbor Freight Predator 212 (See Ashway 2025 Predator Rules); Fuel tank must be removed, fuel pump and top plate added; Ducar spec pipe and ducar 212 RLV muffler optional on both engines; Both must utilize the Rev limiting coil(part # 212-1260R); Any steel type disc or drum clutch (NO TITANIUM); Spark Plug Required the unaltered NGK ZFR5F-11 or the stock Spark Plug: LG F7TC; No Machining Allowed; No rear gear smaller than 53

22. Flathead 375: Age 15+
○ WKA engine; Open Pipe (Must have safety ring)

23. RWYB: Age 15+
24. 100cc: Age 15+

Predator Ducar Part #s:

  • Muffler: RLV4125
  • Pipe: RLC5066
  • Coil: 212-1260R

ASHWAY SPEEDWAY
2025 DUCAR 212 rules

  1. Engine must be factory rated Ducar 212cc and run in box stock configuration. All parts must be stock OEM factory production parts unless otherwise specified in these rules. No alteration, cutting, grinding or machining of any parts. No sandblasting, tumbling, or polishing of any kind. This is strictly prohibited. All parts are subject to be checked by a known stock part if in question. No reading between the lines. If it is not specifically mentioned in these rules, then it MUST remain stock
  2. Gas: 87 octane pump gas only (Track to supply test sample).
  3. Block: Stock OEM Ducar 212 block with no machining allowed with the exception of cylinder clearance. Maximum bore size 2.758” 0 piston pop up allowed.
  4. Cylinder Head: No machining permitted on gasket surface and absolutely no porting of any kind. Maximum intake valve head diameter 1.062” +- .005” Maximum exhaust valve size .946” +- .005” Minimum depth from gasket mating surface to combustion chamber between valves 1.485” +- .010” (for reference only). The seats must be stock and can have the 3 angles of 30/45/60 as from the factory. However, you may not attempt to excessively sink the valves in an effort to increase airflow. Stock OEM graphite style head gasket only. Minimum .042” thickness.
    No sealer
  5. Piston & Rings: Stock OEM dished piston with valve relief on exhaust side only. Maximum size 2.7565” measured at the bottom of the skirt. Stock OEM rings. No altering of the rings allowed, must be stock OEM.
  6. Rod: Stock OEM connecting rod only. No grinding or polishing for clearance. No stroker or broken edges. No billet rods allowed.
  7. Crankshaft: Stock unaltered OEM crankshaft. Governor gear must be installed in stock location. Max stroke 2.163 +- .010”
  8. Flywheel: Engine must run PVL aluminum die cast flywheel only. No cast iron OEM flywheels. Must utilize stock unaltered timing key. Stock OEM unaltered ignition coil.
  9. Camshaft: Must run stock OEM camshaft. Base circle size .865” +.010 – .005” Maximum Intake lift .225 Maximum In duration at .050” = 210 Maximum In duration @ .200 = 75 Maximum Ex lift .232” Maximum Ex duration @ .050” = 212 Maximum Ex duration @ .200” = 84 All checks to be taken at the push rod.
  10. Valve Train: Maximum valve spring wire diameter .079” Stock OEM springs must be used. (15lb @ .850” reference only) Valve seal allowed on intake side only. No shims – Revised February 2024 – allowed. Stock OEM push rods must be used with a maximum length of 5.825” +.010” Stock unaltered lifters and spring retainers to be used. No lightweight components.
  11. Carburetor: Stock OEM Ruixing carb only. Carb must be completely stock. No machining of any kind. Maximum venturi .615” and minimum venturi size .608” Carb bore maximum .750”
    Stock E-tube with a maximum of 20 holes. 1.092” minimum length and minimum outside diameter of .154”. .066” maximum hole through the E-tube. Butterfly minimum .037” Minimum throttle shaft .115” Minimum screw length .305” Phenolic spacer must remain stock. Maximum pilot jet size .018” (.019” no-go) and must use both o-rings. Maximum main jet size .029” (.030” no-go)

12. Air Box: Stock OEM air box must be used and in stock unaltered form only. Air must enter through the air filter only. Any open unused holes must be plugged. Stock OEM air filter with foam sock must be used.

13. Muffler: Stock OEM muffler in unaltered form must be used. If any doubts about the integrity of the muffler should arise, simply cut the muffler in two, to determine legality by comparing to known stock muffler.

14. Governor: Governor may be removed. Ashway speedway will mandate the Dyno Cams 5250 RPM rev limiting coil part #212-1260R (see article 18)

15. Gas Tank: Stock tank should be removed and an auxiliary tank mounted in the floor pan should be used. A top plate and fuel pump are allowed with the pump be pulsed off the valve cover only. (Track Option) Utilize stock OEM tank with the vent tube unplugged and up to 4 – 1/8” holes in the fuel cap for venting.

16. Low oil shutoff can be disconnected. No taping or decals added to the recoil in an attempt to block off air.

17. Chain guard, throttle linkage, top plate and fuel pump are the only aftermarket parts allowed on the engine.

18. There is no longer a claimer rule. The engine in question must be protested by a competitor or subjected to tech by the track’s promoter/tech employees. The protest and acceptance fees are to be determined by the track.
MARCH 1st, 2024 competitors may utilize the DUCAR OEM rev limiting ignition coil (Part # 212-1260R) as an alternate to the stock OEM governor. You may remove the governor assembly completely and plug holes, leave governor in place and wire in the open position or leave the governor assembly in stock form. Regardless of method chosen, the engine still cannot free rev over 5500 rpm max) We would like to make sure that all Tech Officials are aware that when using a rev limiting coil on any type of engine, the tachometer will show rpm spikes when the engine hits the limiter. As a result of this you will need to watch the tachometer if free revving the engine in post-race tech. The engine should rev to 5200–5300 rpm on average before showing spikes. You should NOT issue a DQ based on maximum recall due to the spikes shown by the rev limiting coil. Revised February 2024

19. If there is any doubt as to the legality of any part on a Ducar 212 engine, the competitor has the right to file a protest with the track/official. The part in question can then be shipped to DynoCams for review. Please include contact information for the promoter and we will contact the promoter with our findings on the legality of the part in question in a timely manner.

20. Ashway speedway option allows the Ducar 212 spec pipe and the Ducar 212 RLV muffler.

21. Ashway speedway requires the unaltered NGK ZFR5F-11 or the stock Spark Plug: LG F7TC