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.