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Tech Updates
CONCORD, NC - To view the Briggs & Stratton rule update, click the links below:
The latest meeting minutes are now available on the WKA website. To view them, click the link below:
MEETING MINUTES
To correct a techbook typo:
801.1 MANUFACTURERS CUP:
A competitor’s best nine out of twelve points-paying finishes (final 1 and final 2) at Manufacturers Cup events count toward the national championship.
CONCORD, NC - The 2018 version of the World Karting Association Technical Manual is currently at the printer, and will be available in the month of November. While Master Members will be receiving their latest edition in the mail, those wishing to purchase a Tech Manual are more than welcome to contact the WKA Office at anytime to place your order.
Anyone wishing to call now may contact the WKA Staff at (704) 455-1606.
CONCORD, NC - With regards to the recent Pit Board that went out September 7 pertaining to a clarification to the steering hub attachment system, after reviewing the existing rules, as per the 2017 WKA Technical Manual, World Karting will be enforcing these existing rules for the remainder of the 2017 season and the rule will be totally rewritten for the 2018 season. World Karting apologizes for the confusion in this matter, as well as any inconvenience this may have caused.
CONCORD, NC - All two cycle karts competing in the Man-Cup and the Road Race series will be required to utilize an auxiliary carb return spring. This rule does not apply to karts using a slide carb with an internal compression type return spring --- several acceptable types are shown below -- other types may be used if inspected and approved by the WKA tech officials.
This rule will be in effect immediately and all karts must be in compliance before entering the track at upcoming events. See pictures below for details.
CONCORD, NC - The WKA Board of Trustees has announced that homologation is now open for engines less than 125cc for the 2018 racing season.
Rules and Procedures may be found in item 117.1.1 in the 2017 WKA Tech Manual.
Due to the late announcement, the May 1st deadline has been extended to June 1st.
CONCORD, NC - The WKA Winter Cup Series officially wrapped up the second national event of the season, with the ultra-long back stretch and technical turns of 103rd Street Sports Complex in Jacksonville serving as the battle ground for the series penultimate event, with the finale coming March 31-April 2 at Ocala Gran Prix.
Making the most of their weekends were Christian Miles, Jack Dorsey, Pauly Massimino, and Brandon Jarsocrak, all doubling up in the win category for the weekend. Dorsey’s wins came in the Comet Racing Engines Yamaha Junior Class both days, while Miles swept the action in the CRPRACING.com Mini Swift Class. Massimino mastered the Woltjer Racing Engines Pro IAME Junior class. And for Jarsocrak, his double success came in the KartSport North America Pro IAME Senior category. Here’s a look at the balance of the weekends winners.
CIK LO206 Senior: Sean Meier, James VanDerZee
Allison Racing Engines Yamaha Sportsman: Garrett Adams, Sam Hinds
IAME USA East Pro Swift Sportsman: Ashton Chilton, Brent Crews
3 classes found different winners both days, one of which was the CIK LO206 Senior class, in which Jacksonville veteran Sean Meier claimed the top honors on Day 1, turning back Daytona winner Corey Towles on the first day, with Hunter Fox, James VanDerZee, and Michael Clark rounding out the top 5. On Day 2, it was VanDerZee’s turn to stand atop the podium, topping Meier in the finale, with Towles, Fox, and Jorge Ruiz making up the top 5. Meier and Towles took the Comet Kart Sales Fast Time awards respectively.
The Allison Racing Engines Yamaha Sportsman class also found parity in the first position, with Garrett Adams and Sam Hinds sharing wins on the weekend. Adams fended off brother Logan Adams on the first day of action, with Hinds, Will Robusto, and Adam Maxwell completing the top 5. Hinds improved 2 notches in the order on Sunday, turning back Logan Adams, while Annie Rhule roared her way into a top 3 finishing position on the final day. Completing the top 5 were Garrett Adams and Adam Maxwell. Sebastian NG and Logan Adams were the Comet Kart Sales Fast Time winners for the weekend.
The beginning of a weekend sweep first came for Jack Dorsey in the Comet Racing Engines Yamaha Junior class, as Dorsey won a great battle with Bryce Aron on both days enroute to the sweep of weekend activities. The 2 drivers also split the Comet Kart Sales Fast Time awards for the weekend as well.
Christian Miles was the next candidate for a double event win for the weekend, taking the highly competitive CRPRACING.com Mini Swift class. After taking the Comet Kart Sales Fast Time award for Saturday, Miles proceeded to top Sebastian NG, Sam Corry, Jorge Ortiz, and Caleb Gafrarar. Miles had a little more work to do Sunday, wrestling the lead away from Comet Kart Sales Fast Timer Sofia D’Arrigo, then eventually fending off Gafrarar for the win, with Bryce Sanders improving from a 7th place run Saturday to finish third. D’Arrigo came home fourth with Ben Maier rounding out the top 5.
The IAME USA East Pro Swift Sportsman class was also loaded with talent, with points leader Ashton Chilton taking down the Day 1 honors. Comet Kart Sales Fast Time winner Lucas Rodriguez came home second, followed by Annie Rhule, Tyler Wettengel, and Jeremy Fletcher. Day 2 found Brent Crews coming to life, sweeping the Comet Kart Sales Fast Time honors, as well as the win, topping Chilton, Rodriguez, Wettengel, and Garrett Adams.
Pauly Massimino was next in line to snare a pair of wins, taking the Woltjer Racing Engines Pro IAME Junior class, as well as the Comet Kart Sales Fast Time efforts both days. Massimino was trailed by Gray Leadbetter, Kaden Wharff, Isabella Robusto, and Alex Yankowski on Saturday, while Madison Campeau improved from 6th to 2nd on day 2, followed by Robusto, Leadbetter, and Gunner Bischoff.
Brandon Jarsocrak rounded out the Four Horseman who took double event wins, taking the KartSport North America Pro IAME Senior honors on day 1, followed closely by Comet Kart Sales Fast Time winner Ryan Raffa, Lance Fenderson, Abby McLaughlin, and Jonathan Yobaggy. On day 2, Jarsocrak fended off Fenderson, the Fast Time winner, with Raffa, McLaughlin, and Yobaggy making up the top 5.
With 2 events in the books, it’s down to the third and final event of the winter season to see who the 2017 Winter Cup Champions will be, as focus now turns to Ocala Gran Prix March 31-April 2.
Champions in all classes, with the exception of the ROK Shifter class, will receive a set of Bridgestone tires, as well as a free entry into one of the remaining four Bridgestone Manufacturer Cup Series events, those including Pittsburgh, New Castle, Wolf Paving Raceway, and GoPro Motorplex.
The ROK Shifter Winter Cup Champion will receive tires, fuel, oil, and a free entry into the ROK Cup USA Nationals in September in Orlando.
Additionally, any drivers in the Pro IAME Junior and Senior classes who participate in all 3 Winter Cup events will be eligible for a drawing for a trip in October to Lemans, France for the X30 International Finals. The drawing is open to drivers who have participated in all 3 events. Additionally, race and overall event winners from Daytona, Jacksonville and Ocala, will have their names placed in the drawing again, giving those drivers an even better chance to win the trip. Aside from the cost of travel, all other expenses will be paid.
To Register Online for the Ocala Winter Cup, CLICK HERE.
For those who wish to print out the entry blank and send it to WKA, the paper entry blank is available by CLICKING HERE.
212.1.4 Add: Ties to be broken by qualifying.
212.1.4.1 When only one heat race is being run, the line-up will be based on points scored in qualifying and the heat race (0,2,3,4 etc) -- ties to be broken by qualifying.
214.3 and 214.4 Delete 5.30 to 1 minimum gear ratio.
601.9 Blowdown checking procedure -- # 6 -- effective 4/17/2017 -- the value must be between 0.390" and 0.420"
Figure 609 -- TAG Spec's -- page 108-- All IAME Leopard and X30 Max Bore Spec's -- change from 54.30 to 54.35 effective 4/17/2017.
402.1 Add: Maximum width on any tire and wheel assembly -- 10.375"
609.9.2 First cone length of 10.375" -- change to 7.5"
CONCORD, NC - Recently we have received several calls regarding the wheel width rules for the LO206/CIK Senior class that will be competing in the Man-Cup series in 2017.
Max overall wheel width front --5.625" --- rear --8.5" (mounted assembly as raced)
This clarification also applies to the LO206/CIK class (362.18) being run in the Road Race Series also.
CONCORD, NC - TECH MANUAL UPDATE 618.6 PRESSURE / VACUUM TESTING
Testing may be performed to insure extra air is not being pulled into the engine for a performance gain. Any means to bypass the intent of the class rules is illegal. Both pressure and vacuum tests may be performed -- engine must hold 5 psi for 60 seconds and/or 5 HG of vacuum for 60 seconds.
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Blowdown checking procedure for Yamaha engines --- (601.9 and Figure 606.2)
1 -- By a careful visual inspection (light check) , identify the highest exhaust port and the highest intake port.
2 -- Using the Lad tool, zero the dial indicator on the highest exhaust port, taking care to hold the shaft of the tool against the cylinder wall.
3 -- roll the crankshaft backwards five turns (.500" on the dial indicator)
4 -- insert the Lad tool into the highest intake port, holding the shaft of the tool against the cylinder wall.
5 -- roll the crankshaft forward until the piston stops on the Lad tool and note the value.
6 -- the value must be between .380" and .420" to be considered legal
7 -- engine to be checked as raced
CONCORD, NC- Please note the following clarification and/or changes to rule 618.6: 618.6 PRESSURE / VACUUM TESTING
Testing may be performed to insure extra air is not being pulled into the engine for a performance gain. Any means to bypass the intent of the class rules is illegal. Both pressure and vacuum tests may be performed -- engine must hold 5 psi for 60 seconds and/or 5 HG of vacuum for 60 seconds.
CONCORD, NC - At the WKA meeting March 6, 2015, the trustees voted to accept the Briggs and Stratton LO206 engine rules -- some of these rules were not included in the 2016 techbook -- please note following clarifications and/or changes: 708 BRIGGS LO206
add -- all items may be compared to know stock parts to insure compliance.
The Briggs and Stratton 2016 LO206 Engine Class Regulations may be used in conjunction with rules listed here in section 708.
708.5.3 VENTURI:
The vertical dimension is 0.792" no-go. Horizontal dimension is 0.615". (delete 0.618') -- the gauge may not pass into the slide area.
"When the 0.602" gauge is inserted horizontally, it may not pass into the slide area at the narrow point formed by the overlap of the two venturi circles" (delete 0.605")
Venturi idle fuel hole = .038" max
708.3 AIR FILTER
The only air filter permitted is the Briggs & Stratton Green Air Filter Part #555729. No modification to the filter element is permitted. A protective shield may be attached for wet-weather competition. It is not permitted for the protective shield to create any ram-air effect.
708.6.4 delete all
708.11 HEAD GASKET
Unaltered B&S part #555723 is the only head gasket allowed.
Minimum thickness allowed is .049" -- measurement must be performed using a
micrometer -- readings are taken from inside
the cylinder hole of the gasket closest to the
combustion chamber -- four measurements must be taken with 3 meeting
the minimum thickness of .049”
708.14 VALVES
Intake valve -- minimum weight of valve 27.80 grams -- diameter of valve stem = .246" to .247" --diameter of valve head = 1.055" to 1.065" -- diameter of valve seat = .972" inches ID maximum -- valve length minimum 3.3655" -- height from angle of valve face to top of the valve .057" minimum -- single angle only = 45 degrees
Exhaust valve -- minimum weight of valve = 27.20 grams -- diameter of valve stem = .246" to .247" --diameter of valve head = .935" to .945" -- diameter of valve seat = .850 inches ID maximum -- valve length minimum = 3.3655" -- height from angle of valve face to top of the valve = .060" minimum -- single angle only = 45 degrees
708.16 VALVE SPRINGS
Valve Springs are single coil stock, unaltered B&S part # 26826 -- must be identical in appearance to factory part and have 4.00 to 4.75 coils in stack -- Spring Wire Diameter .103" to .107" -- Valve spring length = .940" max -- Inside diameter = .615" to .635"
708.16.3 delete
708.5 CARBURETOR
The B&S stock carburetor part #555658 is the only carburetor permitted -- "Walbro", "Briggs" diamond logo and or #590890 etched in the body are additional visual indicators -- No alterations allowed unless stated below -- all parts will be compared to a stock known B&S part for eligibility -- this includes the nozzle, emulsion tube, jets, float, float needle and all other carb parts -- it will be allowed however to adjust the float height by means of bending the small tab on the float arm -- slide must remain B&S stock unaltered -- slide cutaway to be measured on flat surface = .075" no go -- B&S stock unaltered aluminum needle is required part number 555602 marked #BGB
708.9.1 ROCKER ARMS
Overall length 2.820" minimum
708.17.2 VALVE SEATS
delete -- "must have only one 45 degree angle on valve seats"
add -- Valve maintenance permitted (valve job). Valve seats must remain with the
factory specification of 30 and 45 degree angles only. Valve seats of additional
angles and/or excessive material removed when compared to the factory
stock is prohibited.
