2025 GAS GAS MC 125 Technical Analysis & Specification Breakdown
At the heart of the 2025 GAS GAS MC 125 cross - motocross motorcycle, GAS GAS pairs a 124.8 cc (7.6 cu in) liquid-cooled single cylinder, two-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 40 HP (29.2 kW), transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 320.5 HP per liter, the engine character is placing it firmly in high-revving supersport territory where top-end breathing dominates.
On the scales, the MC 125 measures 92.8 kg (205 lbs) dry, translating to a power-to-weight ratio of 0.43 HP/kg (2.32 kg per horsepower). Rider ergonomics and chassis geometry center around a 956 mm (37.6 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,493 mm (58.8 in) wheelbase engineered for balanced agility and highway composure.
Within MotoLibrary's GAS GAS archive, this model family spans 8 indexed model years from 2004 to 2025, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
320.5 HP/L
Power-to-Weight
0.43 HP/kg (2.32 kg/HP)
Standover Height
956 mm (37.6 in)
Engine
Displacement124.8 ccm (7.62 cubic inches)
Engine TypeSingle cylinder, two-stroke
Power40.0 HP (29.2 kW))
Bore x Stroke54.0 x 54.5 mm (2.1 x 2.1 inches)
Fuel SystemInjection. Keihin EFI, throttle body 39 mm
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
