Hyosung GV125 Carb Aquila Specs, Pictures & Shop Resources

Searching for the definitive Hyosung GV125 Aquila specifications? Whether you have the early “Classic” twin-pipe or the “Facelift” Bazooka model, this guide covers every technical detail for the 2001-2017 carbureted V-Twin. Learn how to hit 80mph with our exclusive 520 chain conversion, find verified service data, and access the UK’s largest stock of GV125 maintenance parts.

Hyosung GV125 Aquila (2001-2017) – Known globally as the GV125C, Mirage, or “Avitar,” this machine remains the king of the full-size 125cc cruisers. Featuring a high-revving DOHC 8-valve V-Twin, it offers a presence that dwarfs nearly every other learner-legal bike. Note: This model has zero backwards compatibility with the newer GV125-S Bobber. Whether you are restoring a 1st Gen spoke-wheel classic or the later digital-dash facelift, this is your one-stop technical resource.

Hyosung GV125 Aquila (Carbureted) – Technical Specifications

⚡ Engine & Performance

Engine Type: 90° V-Twin, 4-Stroke, DOHC, 8-Valve (4 per cylinder)

Cooling: Air / Oil Cooled (Oil Cooler standard)

Displacement: 124.7 cc (Bore 44mm x Stroke 41mm)

Power Output: 14.2 HP (10.6 kW) @ 10,300 RPM

Compression Ratio: 11.3:1

Fuel System: Mikuni BDS26 Double Carburetors (Short intake type)

Transmission: 5-Speed Constant Mesh (6-speed on select 2004-05 export units)

Valve Clearance (Cold): IN: 0.1~0.2mm | EX: 0.2~0.3mm

🚀 Performance Exclusive: The GV125 is notoriously heavy. We are the world’s only provider of the 520 Chain & Sprocket Conversion Kit. This mod is essential for guaranteed 80+ mph performance on the A-roads.

🛠️ Chassis, Brakes & Suspension

Front Suspension: Telescopic Forks (120mm travel)

Rear Suspension: Dual Shock Absorbers (5-Step Preload Adjustable)

Front Brake: 280mm Single Disc (DSG Caliper pre-05 | TCTC Caliper post-05)

Rear Brake: 130mm Drum Brake

Tyres: 110/90-16 (Front) | 130/90-15 (Rear)

🛑 Braking Upgrade: To stop this 172kg beast, we stock Goodridge UK Braided Brake Lines. Trusted worldwide, Goodridge provides a lifetime-guaranteed “sharp” lever feel. Don’t forget your Rear Drum Shoes and Replacement Rear Cables for wet-weather reliability!

📏 Dimensions & Capacities

Dry Weight: 172 kg (Curb Weight ~185 kg)

Seat Height: 665 mm (Ultra-low for learner confidence)

Fuel Capacity: 14 Litres (including reserve)

Oil Capacity: 1.5L (Filter change) / 1.65L (Full Overhaul)

Wheelbase: 1,515 mm

Fork Oil: 250cc per leg (Tellus #22 or equivalent)

Identifying Your Generation (1st Gen vs. Facelift)

Because Hyosung updated the GV125 several times, part compatibility is specific to your build date:

1st Generation (2001-2005): Chrome engine casings, spoked wheels (tubed), 35W headlight (6″), mechanical speedo cable, and twin exhausts.
Facelift Generation (2005-2017): Dull grey engine casings, alloy wheels (tubeless), 55W large headlight (7.6″), and a 2-into-1 “Bazooka” exhaust. The dash features a digital fuel gauge and LCD odometer.
The “Bobber” Split: Post-20+ GV125-S (EFi) models share almost no parts with this carbureted version. Always verify your intake setup before ordering parts!

The HyoRiders Maintenance Checklist

Carb Maintenance: Removing the airbox is a nightmare for mechanics. The intake pipes are fragile and discontinued—use our Intake Pipe Removal Guide to save your rubbers!
Charging System: The tiny stock regulator fails often, destroying stators. Upgrade to our Heavy Duty Regulator.
Clutch Grip: If you ride with luggage or a passenger, the standard clutch will slip. We recommend the EBC Full Clutch Rebuild Kit (including plates, springs, and thrust bearings).