Hyosung GT125 Comet & GT125R (up to 2009) Specifications – Picture Gallery – Wiki – Manual

Hyosung GT125 Comet & GT125R Specifications
(up to circa 2009)

The Hyosung GT125 series, including the GT125R and GT125 Comet, represents one of the most popular small sports bikes in the UK market. Known for its reliable performance, sporty design, and accessible handling, it remains a favorite among new riders and enthusiasts alike. This model was produced from 2005 to around 2009 and has several variations over the years.

📝 General Info

• Model: Hyosung GT125R / GT125 Comet
• Years: 2005 – 2009
• Category: Sports
• Also known as: GTR, GT, Comet R Supersport, Comet Naked
• Changes / Features over the years: Early models featured silver frames; later years saw black chassis and, on final models, black engines with slight rear tail redesign (pre-RC).

⚙️ Engine & Transmission

• Displacement: 125cc
• Engine Type: Air/Oil-cooled DOHC 8-valve 75° V-twin
• Power: 14.2 hp (11 kW) @ 10,500 rpm
• Top Speed: ~75-80 mph
• Bore x Stroke: 44 x 41 mm
• Valves per Cylinder: 4
• Fuel System: Mikuni Carburetor
• Lubrication: Wet sump oil
• Ignition: EDGETEK CDI
• Cooling: Liquid coolant
• Compression Ratio: 11.3:1
• Fuel Consumption: ~50–60 mpg (reported)
• Final Drive / Gearbox: Constant mesh, close-ratio 5-speed (1 down, 4 up) + chain

🛠️ Chassis, Suspension & Brakes

• Frame: Tubular steel frame
• Front Suspension: GT125R – Upside-down forks; GT125 Comet – Standard silver forks
• Rear Suspension: Dual side aluminum swingarm with gas-charged hydraulic mono-shock
• Front Tyre: 110/70 R17 54H
• Rear Tyre: 150/70 R17 69H
• Front Brakes: Semi-floating single disc, 2-piston caliper
• Front Brake Diameter: 300 mm
• Rear Brakes: Petal-shaped single disc, 2-piston caliper & stainless hose
• Rear Brake Diameter: 230 mm

📏 Dimensions & Weight

• Dry Weight: 128 kg
• Max Torque: 10.2 Nm @ 9750 RPM
• Seat Height: 810 mm
• Height: 1130 mm
• Length: 2090 mm
• Width: 700 mm
• Ground Clearance: 155 mm
• Wheelbase: 1435 mm
• Fuel Capacity: 17 Litres
• Color Options: Red / White / Black / Grey / 2-Tone Models

🌐 Resources & Community

• 🚥 Hyosung Community Forums – Technical Help
• 🛍 HyoRiders Shop – Aftermarket parts & accessories
• 🚥 Parts Request – Local dealers and vendors
• 🚚 UK Dealers/Vendors
• 📥 Hyosung Owners Manual & Workshop Books
• 🚥 HyoRiders Owners Club – Pictures, discussions & technical resources

More bike specs & industry news: KR.Motors

This page is regularly updated. If we missed any details, let us know in the forums or leave a comment below.