Market Segment:
Off-road (Enduro) and Supermoto motorcycles
Competitors:
KTM EXC, Husqvarna WR, Beta RR, Yamaha YZ/WR, Suzuki RM/RMX, Honda CR/CRF, Kawasaki KX/KDX
Vehicle Type:
2-stroke off-road and supermoto motorcycles
Engine Configuration:
Single-cylinder, liquid-cooled, 2-stroke
Purpose:
Designed for competitive off-road riding (enduro, cross-country) and street-legal supermoto applications.
Manual Utility:
Essential for identifying and sourcing correct replacement parts for maintenance and restoration.
Covered Models:
Gas Gas EC 125, EC 200, EC 250, EC 300, MC 125, MC 200, MC 250, MC 300, SM 125, SM 200, SM 250, SM 300
Estimated Page Count:
Variable (typical for a comprehensive parts list manual, often 150-300 pages depending on detail)
Manual Type:
Part List Manual (Illustrated Parts Catalog)
Engine Components:
Cylinder, piston, crankshaft, connecting rod, cylinder head, valves, carburetor components, exhaust system components
Chassis Components:
Frame, subframe, swingarm, linkage, footpegs, seat
Suspension:
Front forks (internal and external components), rear shock absorber, linkage bearings
Brakes:
Front and rear brake calipers, master cylinders, brake lines, brake pads, rotors
Cooling System:
Radiator, hoses, water pump components (if applicable)
Fuel System:
Fuel tank, fuel cap, petcock, fuel lines, carburetor jets and components
Ignition System:
Spark plug, ignition coil, CDI unit (component identification)
Exhaust System:
Expansion chamber, muffler, header pipe, mounting hardware
Wheels And Tires:
Rims, spokes, hubs, bearings, tire sizes (identification)
Electrical System:
Wiring harness components, switches, lights (component identification)
Controls:
Handlebars, levers, cables (throttle, clutch), shifter, brake pedal
Part Identification:
Detailed illustrations with corresponding part numbers for every component.
Assembly Disassembly Guides:
Implied through exploded views and part sequencing.
Component Lookup:
Enables accurate ordering of replacement parts.
Technical Depth:
Component-level identification and part numbering; does not typically include diagnostic procedures or repair steps.
Type:
Liquid-cooled, 2-stroke
Cylinder Arrangement:
Single cylinder
Bore X Stroke 125:
54mm x 54.5mm (typical for 125cc 2-stroke)
Bore X Stroke 200:
62.5mm x 65mm (typical for 200cc 2-stroke)
Bore X Stroke 250:
66.4mm x 72mm (typical for 250cc 2-stroke)
Bore X Stroke 300:
72mm x 73mm (typical for 300cc 2-stroke)
Displacement 125:
124.8 cc
Displacement 200:
200.9 cc
Displacement 250:
249.3 cc
Displacement 300:
294.1 cc
Horsepower Approx 250:
~45-50 hp (estimated for 250cc model)
Torque Approx 250:
~35-40 Nm (estimated for 250cc model)
Carburetor Type:
Keihin PWK (typically 36mm or 38mm, specific to engine size)
Fuel Type:
Unleaded gasoline with 2-stroke oil pre-mix (specific ratio in owner's manual)
Type:
Pre-mix or Autolube system (depending on specific variant, manual will clarify)
Ignition System:
Digital CDI
Crash Test Ratings:
Not applicable for off-road motorcycles
Braking System:
Hydraulic disc brakes, front and rear
Suspension System:
Upside-down telescopic front forks, Monoshock rear suspension (brand/model specific, e.g., Marzocchi, Sachs, Ohlins)
Frame Construction:
Chromium-molybdenum steel, perimeter frame
Spark Plug Replacement:
Typically every 20-30 hours of use (refer to owner's manual for precise interval and type)
Air Filter Cleaning:
Frequent cleaning, often after every ride or every few hours, depending on conditions.
Piston Ring Replacement:
Every 50-100 hours of use (variable based on riding style and conditions).
Top End Rebuild:
Every 100-150 hours of use (piston, rings, gaskets).
Clutch Maintenance:
Regular inspection of plates and springs, fluid changes.
Engine Oil Type:
High-quality 2-stroke engine oil, specific brand/viscosity recommended by Gas Gas (e.g., Motul, Castrol)
Transmission Oil Type:
Specific gearbox oil, e.g., SAE 10W/30 or 10W/40, API GL-4 or GL-5 (refer to manual)
Coolant Type:
Ethylene glycol-based antifreeze/coolant mixture (50/50 with distilled water recommended)
Brake Fluid Type:
DOT 4 brake fluid
Carburetor Jetting:
Can be sensitive to altitude and temperature changes; requires proper jetting for optimal performance.
Clutch Slave Cylinder:
Occasional leaks or failure of the hydraulic clutch slave cylinder seal (common on many hydraulic clutch systems).
Power Valve Operation:
Carbon buildup can affect power valve operation; requires periodic cleaning and lubrication.
Suspension Seals:
Like many off-road bikes of this era, fork and shock seals can be prone to wear, especially with aggressive use.
