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 USA 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 USA.

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.

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