Hyosung GV650 Aquila Carb Repair Manual (2006-09)

Complete PDF version of the Service Manual for the Hyosung GV650 Aquila (carburetted). A MUST for every Aquila owner.

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OEM Original factory workshop manual.

Models covered by this manual: 2006 to 2009

Number of pages: 222 pages

Table of contents:


This PDF repair manual can be downloaded right after the payment process in complete, on the device of your choice.

We do not offer printed manuals, for the following reasons:

  1. it is more eco-friendly to use a digital version
  2. your manual never gets dirty or greasy
  3. you can always choose to print the specific page(s) you need to work on your bike
  4. you receive your manual immediately after payment
  5. it is searchable
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Hyosung GV650 Aquila

The Hyosung GV650 Aquila is a liquid-cooled, V-twin cruiser motorcycle introduced in January 2006 and produced in carbureted form through 2009 before fuel injection became standard.

This manual covers all technical systems specific to the carbureted GV650 Aquila including engine teardown, fuel system service, chassis and electrical diagnostics.

Engine and Fuel System

  • Engine type: 647 cc liquid-cooled four-stroke 90° V-twin, DOHC, 4 valves per cylinder.
  • Induction: Twin 38–39 mm carburetors (two carburetors, one per cylinder).
  • Ignition: Digital CDI.
  • Compression ratio: ~11.4:1 – 11.5:1 (varies slightly by model year).
  • Power output: ~72 hp @ 9,000 rpm (crank).
  • Torque: ~61 Nm @ 7,500 rpm.
  • Starting: Electric start only.

The carbureted version uses twin downdraft carburetors tuned for cruiser torque and smooth throttle response. Jetting specifications, mixture screw settings, and idle adjustments are included in this manual.

Transmission and Final Drive

  • Transmission: 5-speed constant mesh manual gearbox.
  • Clutch: Wet, multi-plate, cable-operated.
  • Final drive: Belt drive (quiet, low maintenance).

The belt drive system requires periodic tension and wear checks. Manual includes belt replacement procedures and torque specs for all related fasteners.

Chassis, Suspension, and Brakes

  • Frame: Double-pipe steel frame.
  • Front suspension: 41 mm inverted telescopic forks.
  • Rear suspension: Dual shocks.
  • Brakes: Dual 300 mm front discs with dual-piston calipers; single 230–270 mm rear disc with dual-piston caliper.

Service procedures include fork disassembly, shock inspection, brake pad replacement, and hydraulic system bleeding.

Electrical and Instrumentation

  • Display: Green backlit LCD meter cluster (carbureted models only).
  • Odometers: Dual trip meters plus total distance.
  • No factory tachometer despite rev limiter set at ~10,500 rpm.

This manual provides wiring diagrams, connector pinouts, and charging/ignition system diagnostics.

Fuel Tank and Range

  • Tank capacity: ~16 L.
  • Reserve capacity: ~5 L reserve.
  • Range: Effective riding range after reserve can exceed 80 km under normal conditions.

Fuel system chapter details petcock operation, carburetor drain, float height specification, and fuel line routing.

Model Years Covered (Carbureted Version)

  • 2006–2009: Carbureted Hyosung GV650 Aquila production years before full EFI adoption.
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