Technical Bulletins

Note: These PDF's are to determine basic component dimensions and weights not posted in Section 675 Chart. In the event of conflicting specifications the Section 675 Chart's specifications take precedence.

(10-08-09) TaG PRD Engine Specifications

(12-17-09) Tag Motori 7 Engine Specifications

(07-14-09) Gazelle and mini-swift pistons information

(07-06-09) ROKTT Engine Specifications

(06-02-09) Gazelle 60cc engine specifications

(05-07-09) TaG Leopard Engine Specifications

2010 Rule Updates

Note: The list below includes 2010 Rulebook updates only. To obtain a copy of the current Rulebook please contact the IKF Office.

Section 102.2.1 Rule Change Enactment

Rules go into effect 30 days after being posted on the IKF Website.

2010 Rule Updates

07/19/2010: Section 115.4

06/18/2010: Section 675.20

06/10/2010: Section 207

05/24/2010: Section 312.2.1

05/05/2010: Sections 503.8, 504.2, 506, 506.1, 507, 508

04/28/2010: Sections 104.6.4, 722, 723

03/26/2010: Section 213.4

03/16/2010: Section 404.4

03/08/2010: Section 213.4

03/08/2010: Section 404.4

02/17/2010: Section 603.2.19

02/12/2010: Sections 312, 312.2.1

02/05/2010: Sections 101.3.4.1, 101.4, 212, 404

01/27/2010: Sections 212.2.1, 212.4

01/25/2010: Sections 312.2.1, 312.4, 404.2.1, 404.4

01/25/2010: Section 657

01/05/2010: Sections 275.5.2, 275.5.3.1, 275.5.3.2, 675

12/30/2009: Section 200.1

02/05/2010
Section 101.3.4.1 #3, #5, #6, #8

Remove: "with participation from at least two regions".

02/05/2010
Section 101.4 Election of IKF Board of Directors

Change to read:

101.4.1 Ballots for election to the Board of Directors shall appear in the August issue of Karter News each year. Two nominations are required for a Candidate to be placed on the ballot for the Board of Directors.

101.4.2 Nomination Forms must be returned to the IKF Office by September 5, or the next businesss day, to be valid.

101.4.3 Nomination Acceptance Forms shall be mailed to each Nominee by September 10.

101.4.4 Acceptance Forms and Nominee Platform must be received at the IKF Office by September 24 to be placed on the Ballot.

101.4.5 Nominees and their Platforms will appear in the November issue of Karter News.

101.4.6 Ballots will be sent to the membership before November 15.

101.4.7 Voted ballots must be returned to the Accountant by December 7.

101.4.8 Ballots will be counted after the Fall Board of Directors meeting. Results of the election will be place on the website and in Karter News as soon as possible.

101.4.9 Newly elected Directors will take their office at the January Board Meeting.

04/28/2010

Section 104.6.4 Exceptions Under b. Add to the second sentence before "and" :

Exception must be submitted by Parent or Legal Guardian and must include participant's current weight, height and amount of ballast on current kart.

7/19/2010

Section 115.4 IKF Experts

Add the following:

Section 115.4.1 Road Race

Anthony Honeywell

Joe Kitterman

Scott Kuntze

Scott Saunders

Section 115.4.2 2 Cycle Sprint

Kolby Araki

Section 115.4.3 4 Cycle Sprint

Alan Cathey

Tim Lawrence

Tristan Orear

Mike Schorn

Section 115.4.5 4 Cycle Speedway

Andrew Dove

Kiefer Kalin

12/30/2009
Section 200.1 IKF 2 & 4 Cycle Sprint Tire Groups for Grand Nationals

Move 2 Cycle Sprint classes Senior Super Sportsman and Senior Super Sportsman Heavy from "Group 2" to "Group 3"

06/10/2010
Section 207 Add as new Note after Class List

Effective July 1, 2010 allow HPV or KPV engine, pipe and clutch in the HPV-1, HPV-2 or HPV-4 classes.

Effective July 1, 2010 allow HPV or KPV engine or clutch in the HPV-3 class with HPV-3 pipe.

Effective January 1, 2011 allow HPV or KPV engine or pipe with clutch model D-71840 only in HPV-1, HPV-2 or HPV-4 classes.

Effective January 1, 2011 allow HPV or KPV engine with clutch model D-71840 only with HPV-3 pipe in HPV-3 class.

02/05/2010
Section 212

Add: Effective with the 2011 2 Cycle Sprint Grand National, the date of the event will be the last two weeks of August or the first two weeks of September.

01/27/2010

Section 212.2.1 Approved Local Option Classes

Kid Kart 150#

Jr. Super Sportsman Heavy 310#

Sr. PRD Spec 360#

Junior HPV 1 Heavy 250#

Kid Kart Heavy 160#

Junior HPV 2 Heavy 330#

Jr. II PRD Spec 320#

Sr. PRD Spec Heavy 380#

Junior I Comer Heavy 235#

01/27/2010

Section 212.4 Official Schedule:

Day 1
1. Kid Kart……………………………..…………….150
2. Rookie Sportsman………………..………….…235
3. Jr. Super Sportsman Heavy……………………310
4. Sr. PRD Spec…………………………...……….360
5. Jr. HPV 1 Heavy…………………..……………..250

Day 2
1. Kid Kart Heavy……………………..…...........…160
2. Jr. 1 Comer………………….……….....…........225
3. Iame Cup……………………….………............per IKF
4. Jr. HPV 2 Heavy……………….……….............330
5. HPV 3…………………………..……......….......340

Day 3
1. Jr. 2 PRD Spec………………………….......320
2. Sr. PRD Spec Heavy…………………..........380
3. Jr HPV 1…………………………………...…240
4. Jr. Super Sportsman (rlv 2 pipe)…….....…300
5. Sr. Super Sportsman (rlv 3 pipe)……........340

Day 4
1. IKF TaG…………………………………….…per IKF
2. Jr. 1 Comer Heavy…………………………...235
3. HPV 4…………………………………….……340
4. Jr. HPV 2……………………………………....310
5. Sr. Super Sportsman Heavy (rlv 3 pipe)…,,360

Updated 03/26/2010

03/08/2010
Section 213.4 Official Schedule

July 1

Junior I Briggs Gas Animal Light

Junior II Briggs World Formula

IKF Briggs World Formula Light

Briggs Animal Heavy

Briggs World Formula Masters

Formula 80 Masters

Formula 80 Senior

F200

July 2

Junior I Briggs Gas Animal Medium

Junior II Briggs Animal

Junior II IKF Briggs World Formula Heavy

IKF Briggs World Formula Medium

Briggs Gas Animal

Masters

125 Stock Moto

Formula 80 Heavy

F200 Heavy

July 3

Junior I Briggs Gas Animal Heavy

Junior II Briggs Gas Animal

IKF Briggs World Formula Heavy

Briggs Animal Medium

IKF LTD Mod Briggs Animal

125 Stock Moto Heavy

Formula 80 Limited

Formula 80/85 Junior

01/05/2010
Section 275.5.2 IKF TaG Junior Class

Add: Parilla Leopard MY09 335#

Weight to be reviewed by March 31, 2010

01/05/2010

Section 275.5.3.1 IKF TaG Senior

Add: Parilla Leopard MY09 385#

Weight to be reviewed by March 31, 2010

01/05/2010

Section 275.5.3.2 IAME Cup

Add: Parilla Leopard MY09

02/12/2010

Section 312 Change

IKF Road Race Grand National Schedule (add as second sentence:)

For the 2010 Road Race Grand Nationals only, the TaG Enduro class will run for thirty (30) minutes instead of forty five (45) minutes.

All class rules and weights apply per Section 301.

05/24/2010

Section 312.2.1 Approved Local Option Classes for 2010:

Delete: 80cc Laydown II

Add: FKE 1

02/12/2010

Section 312.2.1 Approved Local Option Classes for 2010:

NCK TaG Enduro II - same class as TaG Enduro (per Section 301), except class will run for thirty (30) minutes instead of forty five (45) minutes.

1/25/2010

Section 312.2.1 Approved Local Option Classes for 2010:

WC Super Stock CR125 Heavy - 16+ - Weight TBD

NCK TaG Enduro II - 16+ - 410#, TaG Light Weights, 390#

WC TaG FBO Heavy - 16+ - TBD

WC Super Stock CR125 - 16+ - 400#

Super Stock Sit Up - 16+ - 320/340#

WC TaG FBO - 16+ - 400#

80cc Laydown II - 16+ - 410#

Yamaha Sportsman (Laydown - can on a stick) - 16+ - 400#

01/25/2010

Section 312.4 Official Schedule:

Day 1

Paid Practice

Day 2

TaG Light

Formula 80 Junior

Formula 80 Senior

Formula 125 Limited Heavy

Yamaha Limited Heavy Sprint

IKF Briggs World Formula Medium

Rotax Max Junior

Rotax Max Light

WC Super Stock CR125 Heavy

TaG Light

Formula 80 Junior

Formula 80 Senior

Formula 125 Limited Heavy

80cc Laydown

NCK TaG Enduro II

Yamaha KT100S Heavy

Rotax Max Junior

Rotax Max Light

WC Super Stock CR125 Heavy

Day 3

WC TaG FBO Heavy

WC Super Stock CR125

Yamaha Limited Light Sprint

IKF Briggs World Formula Heavy

Intercontinental-E

Rotax Max

Formula 125 Limited

TaG FBO Heavy

WC Super Stock CR125

TaG Enduro

Super Stock Sit Up

Intercontinental-E

Rotax Max

Formula 125 Limited

Day 4

WC Tag FBO

Super Stock CR125

80cc Laydown II

Yamaha Sportsman Heavy (Can on a stick)

TaG Heavy

Formula 125

Unlimited/FKE III

TaG FBO

Super Stock CR125

125/150 Open FKE II

Yamaha KT100S Light

TaG Heavy

Formula 125

Unlimited/FKE III

02/05/2010

Section 404

Add: 2010 Grand National will be hosted by the Newton Kart Klub at Newton Kart Track

Newton IA

August 3-6, 2010

01/25/2010

Section 404.2.1 Approved Local Option Classes for 2010:

Kid Kart

Junior III Sportsman - 14+ - Junior II without restrictor plate - 275#

Updated 03/16/2010

Updated 03/08/2010

01/25/2010

Section 404.4 Official Schedule:

August 3rd:

Registration

Parking

Pre-Tech

Practice 4-9pm

August 4th:

Junior I Heavy

Junior II Light

Junior Midget

100cc Super Stock Light

Super Sportsman (Super Box)

Yamaha KT100S Light

5pm Hot Laps

August 5th:

Junior II Heavy

Yamaha KT100S LTD

100cc Super Stock Heavy

Junior I Light

200cc Stock

Open Midget

5pm Hot Laps

August 6th:

Kid Kart

Junior III Sportsman

Yamaha KT100S Heavy

Senior Sportsman

Open

Super Stock Midget

5pm Hot Laps

August 7th

Rain Date

5/05/2010

Section 503.8

Change last sentence to read:

No marked tire may be replaced in competition without prior permission from the Tech Director or his designee.

5/05/2010

Section 504.2 Impound Area

Change second paragraph to read:

Maximum kart size, bodywork specifications, engine legality, exhaust system legality, legal attachment of weights, fuel legality, tire legality, etc. may be inspected in the Impound Area at the Technical Inspectors discretion.

5/05/2010

Section 506 Identification Tag

Change to read:

To insure the competitors the return of their impounded equipment, engine identifications tags, claim checks or other method of identification should be issued at post-race inspection.

5/05/2010

Section 506.1 Engine Markings

Change to read: Method is up to the individual tech inspector.

5/05/2010

Section 507 Protests

Add to end of 2nd paragraph: A fee of $100.00 must accompany each protest.

5/05/2010

Section 508 Appeals

Change the 1st sentence of the 2nd paragraph to read:

The entrant will be responsible for a $100.00 appeal fee, in addition to a shipping fee deposit of $100.00, and shall assume all responsibility and risk involved; fees shall be paid to the Race Director or Tech Inspector at the time the part or parts are prepared for shipping and shall be forwarded to the IKF office.

02/17/2010

Section 603.2.19 Pressure/Vacuum Test

Add: Division and Classes that are subject to this test.

Division 200 Classes:

Kid Kart

Junior I

Rookie Sportsman

HPV 1 Cadet

Junior Sportsman

Division 400 Classes:

Kid Kart

Junior I Light

Junior I Heavy

Junior II Light

Junior II Heavy

01/25/2010

Section 657 -Effective January 23, 2010

657.1 Conditions and Specifications specific to this class:

657.1.1 This set of rules provides engine rules that can be used in either Road Racing or Sprint.

657.1.2 Guidelines offered in these pages are subject to the term "Spirit and Intent" and apply to the technical aspects of this "Stock" shifter kart class. It is expected that all participants will adhere to the spirit and intent of these rules. These are guidelines for fair and equitable competition. They are not the basis to "read between the lines" in order to circumvent the intent.

657.3 Cylinder and Top End: 1997-1999 cylinders are legal. No modification or machining of the cylinder is allowed such as porting, adding or deleting ports, decking of top or bottom of cylinder, or re-Nikasil. Cylinder mounting flanges may be spot faced in the area where the nut meets the flange only. Some factory grinding is performed prior to the Nikasil process on many cylinders. The Technical Director reserves the right to disapprove any cylinder supplied by Honda and not modified. Some OEM cylinders may not be acceptable for IKF competition.

Cylinder length is 3.311 - 3.316.

Base gasket to be stock OEM 1999.

657.3.1 Exceptions: Stock power valves may be removed and after market plugs used, with no filing, welding, or modifying of the cylinder. The power valve actuator rod hole may be plugged. OEM power valve covers may be replaced with aftermarket plates.

657.3.2 Cylinder Head: Head must remain OEM with no modifications or machining of any kind. Head must fit factory profile using the Shockwave "Stock CR125" profile gauge. Removal of mounting boss and modifications to the water outlets, for the purpose of hose connection, are allowed.

Head gasket must be stock OEM.

Squish or deck height measurement through the spark plug hole will be a minimum of .050 thousandths, using .060 solder. This is not intended to be a minimum or maximum dimension. This dimension is a "quick" check to determine if any non-conforming modifications are present.

657.3.4 Piston, ring, wristpin and upper rod bearing must be stock OEM. No modifications of any kind. Lapping the bottom of the ring is permitted.

657.5 Intake System:

657.5.3 Manifold and reeds: Intake manifold must be stock 1999 OEM CR125 (Honda Part Number 16221-KZ4-A10 - most are marked KZM4) with no modifications. The reed cage must be 1999 CR125 (Honda Part Number 14100-KZ4-J11) After market replacement reeds will be allowed, including mono reeds or stiffeners. This only allows reeds that may be installed without modification to the 1999 reed cage and does not permit multi-stage reeds.

657.6 Ignition System:

657.6.2 The stator and flywheel must be stock 1999 OEM. Only repairs approved by the Technical Director may be done to the wiring. Stock flywheel key must remain in place with no modifications. The left hand lower limiting plate on the stator must be intact, with no modification. Either the factory limiting plate or SKUSA limiting plate (available from SKUSA) may be used. Machined aluminum stator slots, underneath unmodified limiting plates, are allowed at this time. No modification to the hold down bolts is permitted. Static timing must be controlled by the stock stator plate or the SKUSA plate. No modification to any of the components that change the static timing.

657.7 Exhaust System:

657.7.1 Exhaust: Only the following exhausts are allowed. No modification of any kind is permitted. Exhaust flange is open, but must meet OEM length dimensions. No spacers allowed between cylinder and exhaust flange except one OEM steel gasket.

RLV R2 standard stinger (part# 6800)
RLV R2 w/cross stinger (part# 6800/c)
RLV R4 (part# 6830)
RCE T-3

Competitors using either the #6800 or #6800/c pipes are allowed to reduce their minimum weight by 10 lbs.

657.7.2 Silencer: Exhaust silencer body shall be a minimum of 12 inches and a maximum of 14.5 inches in length. Diameter will be at least 3 inches . Factory produced silencers only, no modifications allowed.

01/05/2010

Section 675 TaG Engine Package Specifications Chart

Add: Parilla Leopard MY09 Specifications same as Parilla Leopard

06/18/2010

Section 675.20 Crankcases

Add as second sentence: Exception: Main bearing pockets may be repaired but may not be relocated in the process.

04/28/2010

Add as Sections 722 Stock International Class Engines & 723 Super Stock International Class Engines

722. STOCK INTERNATIONAL CLASS ENGINES
These rules describe the specifications of International Class engines. All parts must be factory production parts unless otherwise specified in the manual. No machining or alteration of parts is permitted unless specifically noted. All parts are subject to be compared to known stock parts. No reading in-between the lines. If it is not in the rules, it must remain stock. UNLESS OTHERWISE STATED ENGINE WILL BE TECHED AS RACED. Additional rules may be added as IKF move forward with this program.

722.1 FUEL: Gasoline only.

722.2 CLUTCHES: Must be a shoe type clutch. Any stamped drum clutch allowed. No machined drums allowed.

722.3 FUEL TANK: Must be floor mounted.

722.4 CARBURETOR: Huayi types allowed. All Stock carburetor gaskets must be present. Choke assembly must be functioning. Choke bore must be cast.

722.4.1 VENTURI: 0.615" No-Go.

722.4.2 BACK CARB BORE: 0.751" No-Go.

722.4.3 EMULSION TUBE: Must remain stock. 0.6064" No-Go.

722.4.4 LOW SPEED IDLE JET: 0.019" No-Go.

722.4.5 MAIN JET: 0.042" No-Go

722.5 FUEL PUMP: Any pulsed type fuel pump is allowed. Fuel pump must be pulsed from the valve cover or crankcase side cover. *Any other way to pulse must be approved by the IKF Tech Official for the race weekend.

722.6 AIR FILTER: Any air filter allowed.

722.7 AIR FILTER ADAPTOR: After market air filter adaptors are allowed.
722.7.1 MAXIMUM LENGTH: 1.375"

722.8 ENGINE BLOCK: Block must remain stock.
722.8.1 BORE: Maximum bore: 2.685"
722.8.2 STROKE: Stroke is 2.133" plus or minus 0.005"

722.9 CYLINDER HEAD: No porting, grinding or modification.
722.9.1 VALVE SEATS: Valve seats have two angles. Single 4° Bottom and Single 30° top.
722.9.2 HEAD GASKET: Open to maintain minimum 27.5cc chamber volume.
722.9.3 COMBUSTION CHAMBER VOLUME: Minimum 27.5cc.

722.10 VALVE TRAIN: Valve train will remain stock. No Polishing. No grinding. No Alterations.

722.10.1 ROCKER ARMS: Stock 1:1 Ratio OEM rocker arms only.

722.10.2 VALVE SPRINGS: Stock Valve Springs only. Maximum wire diameter is .0705". Maximum spring pressure is 10.8 lbs. at an installed height of 0.850"

722.10.2.1 VALVE SPRING PRE RACE TECH PROCEDURE: Note- a quick field check can be performed as shown below using an inexpensive fish scale. Hook the scale under the rocker arm next to the push rod and lift until the valve opens and note the reading on the scale. If the springs appear to be much over the 10.8 lbs @ .850" spec then the springs can be removed from the head for a proper check.

722.11 CONNECTING ROD: Stock Rod only; No modifications.

722.12 CRANKSHAFT: Stock Crankshaft only: no modifications.

722.13 PISTONS AND RINGS: Stock piston and rings only.

722.14 CAMSHAFT: Camshaft must be stock.

722.14.1 Maximum running lift: on Exhaust is 0.242" taken on valve spring retainer with zero lash.

722.14.2 Maximum Exhaust lift: on cam .232" taken at the pushrod.

722.14.3 Maximum Running Lift: on Intake is 0.238" taken on valve spring retainer taken on valve spring retainer with zero lash.

722.14.4 Maximum Intake lift: on cam .225" taken at the pushrod.

722.14.5 DURATION: Duration check for Intake and Exhaust lobes (taken off pushrod). Cam lobe base circle diameter .865" -.005"/+.010". (All checks will allow +2 degrees for wear and gauge variances.)

722.14.5.1 Exhaust duration of 221.5" degrees at .050" lift/96.5 degrees at .200" lift.
722.14.5.2 Intake duration of 218.5 degrees at .050" lift/85.5 degrees at .200 lift".

722.15 FLYWHEEL AND IGNITION: Ignition must be stock. Stock Flywheel or a Billet ARC Model 6618 or 6619 allowed.
No alterations. No machining. Plastic fins must remain stock.
722.15.1 TIMING: Timing must be stock with stock flywheel key.

722.16 HEADER PIPE AND MUFFLER:
722.16.1 HEADER: Must be single stage maximum 0.750 outside Diameter, 0.635 inside diameter measurement.
722.16.1.1 Maximum length: header and muffler 14" minimum length 10".
722.16.2 MUFFLER: Must be Weiner type, part #89966. Muffler may be welded onto end of header pipe or screwed on.

722.17 STARTER: Pull starter must be present and remain stock. Pull starter may be rotated for a better cranking angle.

722.18 OIL CATCH CAN: Engine oil recovery system required.

722.19 GOVERNOR: Governor and governor components are non-tech.

723. SUPER STOCK INTERNATIONAL CLASS ENGINES
Note: For Super Stock International Class Engines, all rules in Section 722 apply with the following exceptions:

723.1 CLUTCHES: Engine Clutch only. Either Drum or disc clutch.

723.2 CARBURETOR: Main Jet and low speed jet maybe drilled to any size.

723.3 FLYWHEEL: Flywheel must be a Billet ARC Model 6618 or 6619.

723.4 HEADER PIPE AND SILENCER: Header Pipe Length: 18"- Maximum 22". Silencer must be a RLV 91_L type with .1285 no-go holes.

723.5 STARTER: Recoil starter components maybe replaced with a flat flywheel fan cover bolted in place of the recoil starter housing. Starter nut maybe added to employ a handheld electric starter.

Disclaimer:

The IKF does not endorse or determine the competition legality of products and services advertised in the Karter News Magazine, the Competition Regulations & Technical Manual, and on the IKF Web Site. The competitor is responsible for determining the legality of all their equipment for use in IKF sanctioned events.