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November 13th : 2018 tenative schedule is now available

 13HP MINI TRUCK TECHNICAL RULES: Jr. Mini Truck Rules and fine tuning to be determined

  1. CHASSIS SPECIFICATIONS:
  1. UPPER / LOWER CONTROL ARMS, SPINDLES AND WHEEL HUBS:
  1. SUSPENSION:
  1. SWAY BARS:
  1. AIR DUCTING:
  1. REAR END:
  1. MOTOR LOCATION:
  1. FLOOR PAN:


  1. FIREWALL:
  1. GROUND CLEARANCE:
  1. WHEEL BASE:
  1. TREAD WIDTH:


.

  1. WHEELS / TIRES:
  1. STEERING:
  1. STEERING SHAFT SPECIFICATIONS:
  1. SEATS:
  1. FUEL CELLS:
  1. WEIGHT:
  1. BATTERY:
  1. CLUTCH:
  1. CHAIN GUARD: NOT MANDITORY:
  1. BRAKES:
  1. KILL SWITCHES:



  1. REAR AXLE:
  1. SAFETY BELTS:
  1. WINDOW NETS:


  1. SAFTEY HELMET and APPAREL:

(SA2010 or newer mandatory)

(SFI rating mandatory) ABSOLUTELY NO NYLON OR OTHER FLAMABLE MATERIAL

BALACLAVA - Nomex balaclava strongly recommended


BUMPER BAR: Max tube size 1”x.095 1- Rear, 2-Front. No external bars, Bottom of rear bumper –No higher than 13” from ground.

  1. BODY DIMENSIONS:
  1. NUMBERS:
  1. MIRRORS:
  1. APPEARANCE:
  1. MOTOR:






OLD GX ENGINE SPECIFICATIONS

NOTE: All engines must be properly assembled in accordance with Honda shop manuals.

MOTORS :

Engines may be built by anyone to accordance to Honda shop manual BUT can only be dyno. tested or sealed by either Keith Marshman, Dave McAdams and Gary Custer (with a Serial Trace)


            : Crankcase oil > 4 cycle engine lubricating oil that conforms to SAE or API standards with any additives a sample of oil maybe provided at any time by TECH.








 New GX390VT2 Engine Rules:


1. Governor may be removed

2. De-compressor must not be removed

3. Block may be bored to the 3 honda oversizes

4. Piston may be a minimum of .035 below deck

5. Piston dish must be a minimum of .080

6. Stock Honda rings must be used & installed properly

7. Any ring gap allowed

8. Stroke shall be a maximum of 64.1mm or 2.524

9. Stock or .010 undersize rods allowed

10. Any heat range spark plug as long as stock reach

11. Stock 25T valves & keepers, stellite exhaust allowed

12. Valves may be refaced but not excessively

13. Any valve spring allowed

14. 13hp carb.stock jets & emulson tube allowed only.NO JETS LARGER THAN 110 ALLOWED .no modified carbs.

15. Minimum head thickness is 3.728

16. Head is a 25Twith minimum CC of 37

17. Head gasket is steel approximately .010 thickness

18. ZF6 old style coil & flywheel may be used

19. ZF6 old style coil & rebroached new flywheel allowed

20. Any ignition timing allowed

21. Any flywheel to coil air-gap allowed

22. Any camshaft to crankshaft timing allowed

23. No metal added or removed from camshaft

24. Cam lobe height for intake is 1.275-1.290

25. Cam lobe height for exhaust is 1.255-1.270

26. Max lift with 0 lash at intake valve is .325

27. Max lift with 0 lash at exhaust valve is .305

28. Cam must have stock lobe separation angle

29. Any vacuum operated fuel pump allowed

30. Three angle seat grinding allowed

31. Valved guards to be in stock location

32. No porting, no polishing, no deburring, no matching


All engines to be properly assembled as per Honda shop manuals

All parts to be compared with a know stock Honda part to verify originality

New replacement  rod with bearing  G X 390 – A R C -# 6272 .

MAX . Horse Power for these motors with stock parts allowed is 21 HP


NOTE: Some new engines have 3 groove cast iron camshafts and some have camshafts with sintered lobes pressed on a billet shaft


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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