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November 13th : 2018 tenative schedule is now available

 9HP JR.  LATE  MODEL TECHNICAL RULES

  1. DIMENSIONS:   
  1. BODY:
  1. ENGINE:
  1. CHASSIS:


SUSPENSION:

  1. WHEELS AND TIRES:
  1. SAFTEY:
  1. OTHER:
  1. STEERING:
  1. AIR CLEANERS:MANDATORY. Stock, including filters, as supplied with motor. No ram tubes or ducting allowed. Stock air cover not required. .
  2. APPEARANCE:
  1. BATTERY:
  1. BODY:
  1. BODY AND APPERANCE:

Body must be straight, sound, stock appearing and in stock position on frame. Alterations or customizing to gain any advantage is prohibited. Original wheel arches must be retained. Original body seams must be retained. No hood pins or fastenings devices out-side of body. Lexan rub rails allowed, 11/4” (out max) must be within wheel track- 46” MAX.


  1. BRAKES:
  1. BUMPERS:
  1. CHASSIS:
  1. CLUTCH:


  1. DRIVE-LINE:
  1. EXHAUST SYSTEM:
  1. FIREWALL:
  1. FUEL PUMP:
  1. FUEL:
  1. FLOOR:



  1. DUCTING:



  1. FUEL CELL:
  1. GRILLE:


  1. HOOD:
  1. NOSE:
  1. IGNITION:
  1. INTERIOR:
  1. INSTRUMENTS:
  1. MIRRORS:
  1. PAINT AND LETTERING:

NOTE: Both front fenders (considered being from nose of car to the number on the door) and windshield banner shall be completely free of lettering of decals. JCAR retains the right to specify type, size and location of all decals on front fenders and windshield.

  1. PEDAL ASSEMBLY:
  1. ROLL BARS:

NOTE: Mini cup chassis use 1” o.d. x .085 d.o.m.

  1. SAFETY BELTS & HARNESS:
  1. SAFETY HELMET & APPAREL:

NOTE: If running head and neck restraints (HAANS) is worn. You do not need neck collar  If using a HAANS both head support  are MANDATORY.

  1. SEATS:
  1. WEIGHT:




  1. WEIGHT LOCATION:

Weight must be securely bolted between outer frame rails and behind front axle and a head of rear axle centers. With a welded in bracket with 2 bolts and painted white with your number on it .

      WHEELS:

  1. WHEELBASE / TREAD WIDTH:
  1. WINDSHIELD / WINDOWS:

OLD STYLE ENGINE SPECIFICATIONS

** All parts may be compared with known Honda parts to verify their originality. One off parts will be considered unacceptable manufactures deviations.

ALL DECISIONS BY PIT STEWARDS, CHIEF TECHNICAL INSPECTOR OR JCAR EXECUTIVE COMMITTEE MEMBERS WILL BE FINAL, ALL RULES SUBJECT TO INTERPRETATION BY JCAR OFFICIALS. RULEBOOKS WILL BE ISSUED TO MEMBERS

GOVERNED BY THE AFOREMENTIONED RULES ARE TO BE SUBMITTED TO JCAR, NOT LESS THAN 30 DAYS PRIOR TO THE DATE OF INTENDED USAGE. NO EQUIPMENT WILL BE CONSIDERED APPROVED BY REASON OF HAVING PASSED THROUGH INSPECTION UNOBSERVED. RULES APPLY TO ALL RACE EVENTS.



  1. MOTORS:
  2.              > crankcase oil – use 4-cycle engine lubricating oilthat conforms to SAE or API standartswith additives. A sample maybe asked for     at any time by TECH. For testing .




Rules For New GX270VT2


1. Governor may be removed

2. Decompressor must not be removed

3. Block may be bored to the three Honda oversize

4. Piston dish may be a minimum of .037

5. Piston may be a minimum of .038 below deck

6. Stock Honda rings must be used & installed properly

7. Any ring gap allowed

8. Stroke shall be a maximum of 58mm or 2.287

9. Stock or  .010 undersized rods allowed

10. Stock or billet cleaner allowed

11. Any heat range spark plug as stock reach

12. Stock 25K valves & keepers, stellite exhaust allowed

13. Valves may be refaced but not excessively

14. Any valve spring allowed

15. Stock carb jet & emulsion tube allowed NO jets larger than 92 allowed . NO MODIFIED CARBS

16. Carb must be BE21JA model

17. Minimum head CC is 25

18. Minimum cylinder head thickness is 3.728

19. Head gasket is steel .009 thickness

20. Any flywheel air gap allowed

21. Any vacuum operated fuel pump allowed

22. Only stock ignition timing with stock key allowed

23. Only early style flywheel & coil allowed (fixed timing)

24. Carb throttle bore is .832 max

25. Carb venturi bore is .676 max

26. Camshaft intake lobe height is 1.265 max 1.250 min

27. Camshaft exhaust lobe height is 1.255 max 1.245 min

28. Max lift at intake valve at 0 lash is .282

29. Max lift at exhaust valve at 0 lash is .270

30. Camshaft must have stock lobe separation angle

31. Three angle seat grind allowed

32. No porting, no deburring, no matching

2017 Drivers Profiles

2017 Registration

Insurance Waver

Ages & Cost Memo


Track Rentals & Camping




JUNIOR A & B MICRO SPRINT TECHNICAL RULES 2018.doc Download File Here If you do not understand a rule, please contact us for details. Rules@GrandBendSpeedway.com