2003 GAS GAS Supermoto EC 125 / 200 / 250 / 300 Service Manual

EC series enduro competition motorcycles technical service documentation with maintenance schedules, ignition timing CDI adjustment, and carburetor tuning specifications

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GASGAS Models Covered & Key Technical Specifications

Models: GAS GAS EC 125, GAS GAS EC 200, GAS GAS EC 250, GAS GAS EC 300
Sub-models / Variants: 125 cc, 200 cc, 250 cc, 300 cc
Build Years: 2003
Technical Data:

  • Engine: 2-cycle, single-cylinder, crankcase induction, liquid-cooled
  • Displacement: 124 cc (125), 199.4 cc (200), 249.3 cc (250), 294.7 cc (300)
  • Carburetor: KEIHIN PWK 38
  • Transmission: 6-speed with multidisc clutch in oil bath
  • Ignition Timing: 1 mm APMS
  • Coolant Capacity: 1.1 Liters
  • Fuel Tank Capacity: 9.5 Liters (2.5 US gallons)
  • Drive Chain Slack: 30–50 mm
Technical Specifications
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Document Number / Seller:
23936 / Jennifer Cooper
File Size:
9.43 MB
File Type:
PDF
Language:
English
Pages:
50+
Printable:
Yes
Category:
Motorbike
Last updated / verified
Jan 25, 2026

GASGAS Manual Features & Content Preview

2003 GAS GAS EC 125/200/250/300 Service Manual

  • The 2003 GAS GAS EC 125, EC 200, EC 250, and EC 300 enduro range, including all liquid-cooled 2-stroke engine displacements
  • Official manufacturer publication dated February 2003, featuring detailed technical specifications and maintenance schedules
  • Contains 58 pages of technical data, including transmission gear ratios, suspension adjustment charts, and bolt tightening values
  • Delivered as a direct download the moment payment clears
  • Indexed PDF search covers every chapter and appendix
  • Stored against your account so you can retrieve it after a hard-drive loss
  • Laid out for standard letter and A4 printing
  • This 2003 service publication is the primary factory reference for the 2003-model year EC-series enduro lineup

Technical Coverage and Documentation

The 2003 GAS GAS EC 125/200/250/300 service manual provides structured technical data for the full range of 2-stroke enduro models. Chapters detail engine induction, CDI ignition timing, transmission gear ratios, and cooling system maintenance, ensuring technicians can perform necessary checks based on official manufacturer parameters. The document also includes specific sections on air cleaner maintenance, carburetor tuning with jetting tables, and drive chain adjustment metrics for competitive operation.

Chassis and Suspension Data

Technical data includes comprehensive information on chassis components, braking systems, and suspension calibration. Key values cover WP and Marzocchi fork oil levels (110 mm–120 mm), rear shock rebound and compression settings, and front/rear brake disc diameters. Torque values for critical fasteners, including the 98 Nm rear axle nut and 25 Nm handlebar clamp bolts, are listed in a consolidated torque table for quick reference. This 2003 GAS GAS EC 125/200/250/300 service manual acts as the primary reference for maintaining the 2003 EC-series lineup.

Document Reference: Published February 2003; Pub/Form No. EC 2003 -64-

Manual FAQ, Purchase & Download Details

Does this manual cover the 2003 GAS GAS Supermoto EC 125, 200, 250, and 300 models? keyboard_arrow_down

2003 service manual includes technical data and specifications for the EC 125, EC 200, EC 250, and EC 300 model range.

What technical details and specifications are included for the engine systems? keyboard_arrow_down

Manual contains specification tables detailing bore and stroke dimensions, engine displacement, ignition timing, and carburetor settings for all covered engine sizes.

Are there reference tables for bolt and nut tightening values? keyboard_arrow_down

A dedicated torque table is included, which lists the specified values in both Newton-meters and foot-pounds for various engine and chassis components.

What suspension tuning and adjustment information is available in the document? keyboard_arrow_down

Document contains sections on suspension tuning that reference adjustments for air pressure, rebound and compression dampening, and oil level for the front fork and rear shock absorber.

Is this service manual provided as a downloadable file? keyboard_arrow_down

Publication is provided as a digital PDF document, ensuring compatibility with standard portable devices.

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