GAS GAS Supermoto EC 125 / 200 / 250 / 300 Service Manual, 2003 (P/N EC 2003 -64-)

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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

Model 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
May 29, 2026

GASGAS Manual Features & Content Preview

  • Covers all 2003 GAS GAS EC liquid-cooled 2-stroke models (125cc, 200cc, 250cc, and 300cc)
  • Official 58-page factory publication dated February 2003

Engine & Drivetrain Specifications

This OEM manual delivers the exact technical data and maintenance schedules required to service the '03 GAS GAS EC lineup. The documentation outlines comprehensive specifications for CDI ignition timing, transmission gear ratios, carburetor jetting tables, and cooling system maintenance. It provides mechanics and DIY riders with the precise factory baselines needed for proper tuning and competitive operation, without unnecessary filler.

Chassis, Suspension & Safety Data

Beyond the engine, the guide details essential chassis components and suspension calibration. It lists critical measurements such as WP and Marzocchi fork oil levels (110 mm–120 mm), shock clicker settings, and front and rear brake disc dimensions. A consolidated torque table clearly identifies values for critical fasteners, including the 25 Nm handlebar clamp bolts and the 98 Nm rear axle nut. Since working on suspension and chassis components involves critical safety systems, always support the motorcycle securely on a proper stand and verify all torque values before hitting the trail.

Technical Safety Notice
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This official OEM document is intended for professional technicians and skilled operators. Performing service on mechanical equipment involves inherent risks. By purchasing, you acknowledge that RepairLoader provides original manufacturer data for informational purposes. Always prioritize safety: use correct tools, wear protective gear, and consult a certified professional if you are uncertain of any procedure.

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