WKA: SpeedNews 2004-04-13

WKA's SpeedNews - 04.13.2004 Briggs & Stratton Raptor Aftermarket Connecting Rod Rule and Submission Guidelines. The WKA Board of Trustees has passed the connecting rod rule per the 4-Cyle Tech Committee's specifications effective May 3, 2004.

WKA's SpeedNews - 04.13.2004

Briggs & Stratton Raptor Aftermarket Connecting Rod Rule and Submission Guidelines.

The WKA Board of Trustees has passed the connecting rod rule per the 4-Cyle Tech Committee's specifications effective May 3, 2004. The WKA Board of Trustees is allowing other manufacturers to submit their billet rods based on the approved guidelines by April 26, 2004. All manufacturers submitting a rod will be notified by May 10, 2004 if they are approved. That approval will then become official by notification to the membership. Those approved billet rods (and only those approved) will be considered legal through the 2005 racing season. No other rods will be accepted for approval during that period of time. Guidelines for submission of connecting rods are as follows:

Minimum rod length 3.120
No polishing of rods allowed. Steel 1/4' rod bolts only.
Minimum total rod weight 135 grams
Minimum rod weight less insert 113 grams
Minimum insert weight 22 grams

All rods submitted must have clear identification of part with the Manufacturer's name and part number stamped on the connecting rod.

Please submit all parts to the World Karting Association, 6051 Victory Lane, Concord, NC 28027.


The WKA Heartland Speedway Dirt Nationals presented by the Heartland Bully Clutch Dealers is only a month away from hosting its first ever event. Kartwheels Speedway will be the site to kick off the Championship series May 14th - 16th in Norfolk, Nebraska.

The World Karting Association has established a National team to conduct the event for the first year with WKA officials filling the key roles and plans to expand the team each and every year. "We feel it is important to ensure fair, safe, and consistent racing for the competitors supporting the series", WKA Director of Program Development, Tony Barton. "The WKA is known for their ability to host efficient, well run events and that is important to the racers."

The awards program will be patterned after what is given in the existing Briggs & Stratton Speedway Dirt Series. The top five winners in each class will receive awards while event winners will also be awarded a set of Maxxis or Burris tires. Of course, the Grand National (GN) event slated for October 1 - 3 at Fairground Speedway in Winfield, KS will carry bonus points for competitors, as well as, award the GN race winners a GN Championship jacket and the prestigious Eagle Trophy.

Both the Heartland Speedway Dirt Series presented by the Heartland Bully Clutch Dealers and the Heartland Speedway Pavement Championships will use a supplement rules package that will make the program more karter friendly. As the season moves forward, we will review this rules package and make any changes for the 2005 season. You can download the Heartland Supplement Rules Package at www.worldkarting.com/downloads/HeartlandRulesSup.pdf

The season-ending awards presentation location is yet to be determined, however the ceremony itself is already being prepared. This series will carry the same level of WKA attention as all other National programs, so the awards package will be the standard Championship package. For example, the Champions will receive a Championship ring or watch, personalized Championship jacket, a custom Championship suit, Briggs & Stratton engine (or tires), a Championship Eagle Trophy, and a Championship flag. We will award ten places in each class that qualifies for year-end awards.



National Road Racing Series (NRRS) national and regional events have required dual braking systems in all classes except the Briggs 4-cycle sprint classes. NRRS committee member Van Gilder has submitted the following list of ways to achieve a legal dual braking system.

1. A four wheel braking system that includes a rear axle brake, and separate front wheel brakes. (This system is required on all karts powered by 110 cc engines or larger except Spec 125 Sprint.)

2. A rear brake system with two master cylinders and two calipers. This system may use one or two rear discs. The system may be designed or adjusted such that both systems apply braking force at the same time, or it may use one as a primary braking system and the second as a delayed system.

3. A rear brake system with a standard master cylinder and caliper and a second with a smaller (WKA acceptable) master cylinder and caliper that would take over if the primary system failed.

4. If a kart is equipped with a 4 piston rear caliper, two master cylinders may be used, one to actuate the right side of the caliper and the other to actuate the left side of the caliper. For this approach to be most effective, use of a self-equalizing, swiveling bias assembly between the two master cylinders and a floating rear disk are recommended. Please note that using this design will reduce the hydraulic advantage by 50%. That means that under normal operating conditions, the pedal will move half as far to actuate the brakes and re-quire twice the pressure. To regain normal brake feel, move the clevis attachment point on the brake pedal down and/or the clevis attachment point on the master cylinder lever up. This will increase the mechanical advantage.

The objective of this rule is redundancy. Whatever design you use, your brake system must con-tinue to function if one of the two systems fails. This item will be checked during pre-race technical inspection.

To make sure that your dual brake system functions, it is recommended that you test it yourself before coming to a race event. Simply disable one of the two systems by disconnecting the mas-ter cylinder. Then depress the brake pedal to ensure that it engages the other brake system well before the pedal reaches the end of its travel. Then reconnect that system, disconnect the second system and repeat the test. Finally reconnect both systems.



The National Road Racing Series has approved spring clips, clamping rings, and "E" Clips in steering and braking systems. These retaining devices have been standard equipment on the CIK karts imported from Europe for some time. To be legal in road race competition, these retaining devices must be of the proper size and used in bolts and pins that have a machined grove to ac-cept them. WKA will contact the CIK kart importers to get samples, descriptions, and pictures of their devices. Information on approved devices will be made available to pre-race tech inspectors.

In addition, the reusable cotter pin called a "ring cotter" has also been approved for use on the front axle. Ring cotters are manufactured under trade names such as "Rue Ring Cotters" and by companies such as the Crown Bolt Company. These ring cotters are reusable and include a locking feature that will prevent their coming out, and it has the benefit of being reusable. (Remember, the traditional cotter pin is a single use item).

Note: the retaining devices commonly referred to as "Barry Clips" are still NOT legal in the WKA National Road Racing Series in steering and brake systems. These clips or industrial safety pins are referred to in WKA tech manual sections 200, 250, 400, and 450 as "berry" clips.


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