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Technical Overview
2009 GAS GAS Halley 125 Technical Analysis & Specification Breakdown
Built around GAS GAS's enduro - offroad motorcycle platform, the 2009 GAS GAS Halley 125 features a 124 cc (7.6 cu in) liquid-cooled single cylinder, two-stroke configuration. Internal engine geometry specifies a bore and stroke of 54.0 x 54.5 mm (2.1 x 2.1 inches).
Rider ergonomics and chassis geometry center around a 945 mm (37.2 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,460 mm (57.5 in) wheelbase engineered for balanced agility and highway composure. The 7.4-liter (2 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Standover Height
945 mm (37.2 in)
Engine
Displacement124.0 ccm (7.57 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Bore x Stroke54.0 x 54.5 mm (2.1 x 2.1 inches)
Fuel SystemCarburettor. 26 mm
CoolingLiquid
Transmission
Gearbox6-speed
ClutchMultiple disks in oil bath, hydraulic
Chassis
Front SuspensionFork, 41 mm.
Front Travel255 mm (10.0 inches)
Rear SuspensionSingle rear shock absorber system
Rear Travel246 mm (9.7 inches)
Wheelbase1460 mm (57.5 inches)
Wheels & Brakes
Front Tyre80/90-21
Rear Tyre110/80-18
Front BrakesSingle disc. Twin piston caliper.
Front Brake Ø260 mm (10.2 inches)
Rear BrakesSingle disc
Rear Brake Ø220 mm (8.7 inches)
Dimensions & Weight
Seat Height945 mm (37.2 inches) If adjustable, lowest setting.
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.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
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.
