North American Karting Standards (NAKS)
2003 TAG (Touch and Go) Class
Issue 2.1 February 2003 (A downloadable/printer-friendly version of these engine specifications can be found at bottom of this page.)
1.0 Introduction
For the 2003 year the TAG Class is an experimental class
designed to test the competition level of that variety of new 125cc 2 strokes
and 250cc 4 stroke fixed gear motors with on-board starting systems. As these
motors are being introduced to the racing franchises in
Europe, the imports to the US are growing quickly also. Similar to the Rotax in
design and lap times, they depart from the Rotax competition intent
significantly. These standards should to serve as a baseline of rules through
the 2003 year in North America and are open to any club or organization to
follow. This class is not intended to replace the Rotax Class but will
allow the Rotax motors to compete.
As an experimental class new motors may be added through
the year for eligibility. Be sure to understand this will not guarantee new
motor 'C' will not be significantly faster then earlier motor 'B'.
At year's
end, a review of the various motors may lead to some competition revisions, and adoption of these rules by any other national karting promoter/organization.
TCM Racing has established the
TAG USATM Series, and has done substantial research to achieve parity among 7 main
motor configurations that are currently available for the series. To avoid
multiple rules Issue 2 of the TAG Standards has been restructured and aligned
with TAG USATM.
Technical Specs on the motors are included.
2.0 Combined Class Weights
| |
TAG Sr |
TAG Masters |
| Motor |
Weight (Note 1) |
Weight (Note 1) |
|
Sonik SL125 (Horizontal) |
360 |
395 |
|
Sonik VX125 (Vertical) |
360 |
395 |
|
Rotax Max FR 125 |
360 |
395 |
|
Biland |
365 |
400 |
|
Parilla Leopard |
365 |
400 |
|
Vortex Rok |
375 |
410 |
|
Italsistem ML47H |
390 |
425 |
Note 1: Weights may be subject to change through the year
to equalize competition.
Note 2: Some promoters may require the entrant have the
legal weight of their kart written
on a label somewhere. It is
recommended that a 2" X 3" minimum white label is applied
to
the right sidepod at the top front side.
Note3: Masters shall be minimum age 35 at time of race,
or minimum weight 200 lbs.
3.0 General Engine Specifications
3.1 Air Box: OEM, as supplied with the engine from the manufacturer.
3.2 Carburetors: As supplied from the manufacturer, Jetting open
3.3 Fuel Pumps: Must be of of diaphragm pulse type, type and location are open
3.4 Ignition System: OEM as per factory specifications, spark plugs open
3.5 Piston / Rings / Bearings / Gaskets: Aftermarket parts meeting OEM dimension and
material specifications
are permitted
3.6 Exhaust System Exhaust and silencers as supplied by manufacturer, OEM. No plating or
ceramic coatings permitted
3.7 Clutch OEM, as supplied with engine from manufacturer and as per factory
specifications
3.8 Cooling System Coolant may not contain any Glycol based material. Water wetter or
other surfactants may be added
3.9 Internal Modifications All Internal modifications of any kind are strictly prohibited.
4.0 Chassis Specifications
4.1 Chassis Construction
Round tubing only, maximum diameter tubing 32.0 mm.
4.2 Rear Axle
Maximum diameter of 50 mm
4.3 Brakes
Rear System only, front wheel systems are not permitted
4.4 Bodywork
As per current CIK homologation , or approved by TAG USA
4.5 Chassis Eligibility
As per current CIK homologation, or approved by TAG USA
5.0 Tire Specifications
5.1
55 Durometer hardness minimum unless otherwise specified. See table below for
tires meeting the hardness requirements.
| Manufacturer |
Compound |
|
Bridgestone |
YHC |
|
Dunlop |
SL 4 |
|
Maxxis |
HG(HT) 3 |
|
Burris |
M 30 |
|
MG |
Yellow |
|
Vega |
Red |
6.0 Driver Eligibility
6.1 TAG International Class Minimum age of 16 years of age and above
6.2 TAG Masters Class Minimum age of 35 years of age and above, Run combined
& scored separate.
7.0 Data Acquisition
7.1 Gauges Including Tach, Water Temp, Exhaust Gas Temp, Cylinder Head Temp and timer
are permitted] (including memory models). Modifications to fit EGT probes on Header are
only allowable exhaust modification.
8.0 Technical Specifications for Motors
8.1 Minimum Required Technical Specifications
8.1.1 2 Stroke
|
1 |
Bore Size Maximum |
|
2 |
Stroke |
|
3 |
Number of Cylinders |
|
4 |
Combustion Chamber Volume With LAD Tool) |
|
5 |
Carburetor Venturi Size, Manufacturer, Model Number |
|
6 |
Number of Carburetors |
|
7 |
Ignition CDI Manufacturer and Model Number |
|
8 |
Exhaust Pipe Model # and Factory Identifiers |
|
9 |
Exhaust Silencer Model # and Factory Identifiers |
|
10 |
Number of Reed Petals |
|
11 |
Thickness of Reed Petals ( +/- 0.08mm) |
|
12 |
Number of Transfer Ports |
|
13 |
Transfer Port
Duration (+/- 2°) |
|
14 |
Factory Port
Map on File |
|
15 |
Number of Exhaust Ports |
|
16 |
Exhaust Port
Open Duration Max |
|
17 |
Clutch Type |
|
18 |
Minimum RPM for Engagement |
8.1.2 4 Stroke
|
1 |
Bore Size Maximum |
|
2 |
Stroke |
|
3 |
Number of Cylinders |
|
4 |
Combustion Chamber Volume |
|
5 |
Carburetor Venturi Size, Manufacturer, Model Number |
|
6 |
Number of Carburetors |
|
7 |
Ignition CDI Manufacturer and Model Number |
|
8 |
Exhaust Pipe Model # and Factory Identifiers |
|
9 |
Exhaust Silencer Model # and Factory Identifiers |
|
10 |
Number of Intake Valves per Cylinder |
|
11 |
Diameter of
Intake Port |
|
12 |
Head Diameter of Intake Valve |
|
13 |
Maximum Inner Diameter of Intake Valve Seat |
|
14 |
Intake Valve Stem Diameter |
|
15 |
Minimum Weight of Intake Valve |
|
16 |
Intake Valve Opening Duration (+/- 2°) |
|
17 |
Intake Valve Opens (.15mm valve lash, +/- 1°) |
|
18 |
Intake Valve Closes (.15mm valve lash, +/- 1°) |
|
19 |
Intake Valve Lift Maximum |
|
20 |
Number of Exhaust Valves per Cylinder |
|
21 |
Diameter of
Exhaust Port |
|
22 |
Head Diameter of Exhaust Valve |
|
23 |
Maximum Inner Diameter of Exhaust Valve Seat |
|
24 |
Exhaust Valve Stem Diameter |
|
25 |
Minimum Weight of Exhaust Valve |
|
26 |
Exhaust Valve Opening Duration (+/- 2°) |
|
27 |
Exhaust Valve Opens (.15mm valve lash, +/- 1°) |
|
28 |
Exhaust Valve Closes (.15mm valve lash, +/- 1°) |
|
29 |
Exhaust Valve Lift Maximum |
|
30 |
Minimum weight of each Piston, Pin and Ring Set |
|
31 |
Number of Piston Rings per Piston |
|
32 |
Minimum Weight of Crankshaft |
|
33 |
Minimum Weight of Con Rod |
|
34 |
Clutch Type |
|
35 |
Minimum RPM for Engagement |
8.1.3 Link to Motor Specifications Records data base. (Will be online soon! Please check back!)
8.2 Manufacturer Reference Specs
Sonik SL125
Sonik VX 125
Rotax Max
Parilla Leopard
Biland 250 SA
Vortex Roc
Italsistem ML47H
9.0 Document Revision History
|
Issue |
Changes |
Date |
|
1 |
Release of Document |
1/10/2002 |
|
1.1 |
3.1.2 Wording to control use of OEM Carburetor and
allowable modifications to correct an error. |
1/11/2002 |
|
2 |
Restructure and align with TAG USA Rules |
2/1/2003 |
|
2.1 |
Added Master Class weights to section 2 table and added
Note 3 |
2/20/2003 |
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January 1, 2005
- http://www.tagracing.net/rules/naks.html
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