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Page Last Updated: March 19th, 2008
 

 

TECH NOTES AND CLARIFICATIONS

 

  1. Honda Muffler rule definition of tight muffler: Hand tight until it will not turn anymore then a half turn loose from tight.
  2. Valve Seal under spring is a DQ from the race. NOT a 30-day suspension.
  3. Honda timing and fraction all Honda classes, with or without keyway, 30 day suspension.
  4. Testing for ceramic bearings use Ohm  meter or ring from center race to case.
  5. GX-120 old engine flywheel magnet white; Tier III magnet black
  6. GX-120 will need the new Tier III flywheels come January 2009.
  7. DECO Jr. Novice will run restrictor plate under carburetor.
  8. DECO Jr. Stock will run restrictor plate in exhaust.
  9. World Formula can use any flat washer under flywheel nut.
  10. World Formula shroud:  All holes must be covered with metal not tape. You should t see any of the flywheel. Most of them will have to have a top shield put on. Can be made out of any metal.
  11. World Formula red coil only.
  12. World Formula you can change the exhaust bolts or the exhaust studs to next bigger size.
  13. World Formula exhaust out of port must have port extension. 
  14. World Formula rod bolts any style allowed.

Source: quartermidgets.org

  

Posted: March 19th, 2008

 
 
 
 

Tech Update: Honda Tier III Motor Serial Numbers

As was posted earlier on Quartermidgets.org the new Honda Tier III Motors are not legal for use in the 2007 QMA season.  Please pay attention to the serial numbers on the motors when you purchase them from your builder or local dealer:
HONDA 
These are the beginning #'s of the Tier III Honda motors that you CAN NOT run this year:

 

GX120 #  GCAHK-1085093
GX160 #  GCACK-1120414

Source: quartermidgets.org

  

Posted: March 20th, 2007
 
 

Tech Update: Junior and Senior Stock Specs

 
STOCKERS :  Effective April 1,2007  In the JR & SR stock classes there will be  NO TIMING Rule. 
 
JR Stock MUST run a exhaust restrictor plate. The exhaust port size is to be a minimum spec. of  0.775 and a maximum of 0.875  at the flange max outer around 0.015
 
Any taper, if present, shall be smaller toward the valve seat only.  No port design shall be permitted that will enhance exhaust velocity through restrictor plate.
 
Junior Stock Restrictor Plates are available from the National QMA office. The cost of the plates are $10.00 per plate.

Source: quartermidgets.org

  

Posted: March 20th, 2007
 

 

Tech Update: Carbon Fiber Axles Are Illegal

There have been questions and rumors floating around that  Carbon Fiber Axles are legal to use until January 1, 2008.  This is not the case.  The use of Carbon Fiber Axles were ruled illegal to use in starting November 2006.  These axles were not brought back during the national meeting. The addition of Titanium was added to the list but with a phase-out period of 2007.
 
Titanium Axles - Yes until January 1, 2008
Carbon Fiber Axles - No since November 2006

Source: quartermidgets.org

  

Posted: February 21st, 2007
 

 

Tech Update: Honda Tier Three Heads

With the production of the Honda Tier Three motors and parts for the GX-120 and the GX-160 there have been questions of what the part numbers are and if they are legal for use. 
 
RE: HONDA 120 & 160 Heads
 
Part # 12210-ZH7-415 is the 120 Head
Part # 12210-ZH8-415 is the 160 Head  
 
 
Both are tier 3 heads AND ARE LEGAL TO RUN ON THE OLD MOTORS. (that was a production change a little over a year ago and there just showing up now)
 
This does not include the Tier Three pistons or rings.  You cannot use the new pistons or rings in the old motors.  Anyone caught using the new pistons and rings will be DQ'd with a suspension of six months.

Source: quartermidgets.org

  

Posted: February 19th, 2007
 

 

Tech Update: World Formula

To All Current and Future Owners of Briggs World Formula Engines

 

 Currently Briggs has made some changes to the World Formula Engines that will affect the Tech manual and the performance of the engine.  Briggs is at the end of their homologation with IKF on Jan.1, 2007.  Therefore Briggs has made some significant changes that will have an impact on the W/F engines in our sport.  There is a new Block that has a vertical rib up the cylinder, an Aluminum Flywheel that will replace the current cast iron unit that will be about 3 Lbs. lighter. Also a new PVL coil, with a built in Rev Limiter.  This will come as a kit, which will prevent anyone from by passing the limiter thus making it fairer and easier to tech.  Also a new Heat Dispenser you can install in the head in the #4 bolt hole by drilling and tapping with a 7/16th tap.  Or you can get a new head with it already done.  This is suppose to help prevent over heating by taking about 60degrees out of that area in the head which should solve the head gasket blowing problem.  Finally a New Fire-ring Head Gasket is also part of the upgrade that will prevent blown head gaskets in the engine.  These parts are available at some Briggs Motor sports dealers such as Fastermotors.net These enhancements will also be standard on all new engines built After the current supply is exhausted.

 

To keep the class on the same level QMA is currently at the moment NOT Allowing these upgrades until everyone can get these and have time to install them and to incorporate these into the W/F Tech manual.  Typically any tech changes and rule changes take effect April 1 so to keep everyone informed of the Mandatory changes these items will be allowed and affected at that time (April 1,2007).  (NOTE: The Block is Not Mandatory)   With most of the racing now dormant this will give ample time to purchase the items and install them before most clubs stat their racing season.

 

Any further information will be posted at www.quartermidgets.org . If you have any questions please ask your local club or regional tech person.  Below is the Part numbers for the upgrades.

 

                                                      PARTS

Fire-ring Head Gasket-555698                               

PVL Flywheel (w/Starter gear)-557126                   

Manifold Clamp-557129                                        

Flywheel Puller-19584

PVL system Complet-557127

Manifold Adapter-557130

Heat Dispenser-557690

 

 

Thanks,

Jerry Mostek

QMA National Tech. Director

 

Source: quartermidgets.org

  

Posted: December 26th, 2006
 

 

Tech Update: 2007 Rule Changes

2007 Rule Changes: Per the 2006 National Short Sheet, the following are rule changes which will be effective January 1st, 2007:

- All QMA restrictor plates will have the QMA logo on them.

- All safety belts will be new or recertified every 2 years with an SFI 16.1 rating.

- Steel fuel tanks will not be allowed

 

Posted: December 26th, 2006
 
 

Tech Update: Restrictor Plate Information

Restrictor plates have arrived at the National Office for the Tilitson Stocker Carburetor (.660).  The Honda plates should be there by now too.  Contact Courtney at the QMA Office 866-QMA-4569, for purchase or exchange.

  

Posted: March 29th, 2006
 

 

Region 4 Clubs