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[Download] Hyosung GT125 & GT250 (Comet/R/RC) – Service Manuals & Owner’s Books

Hyosung GT125 & GT250 Series Resources

The Hyosung GT series is the most popular range in the lineup, spanning the naked GT125/250 Comet, the faired GT125R/250R, and the modern RC/P facelifts. As these bikes are very common across the UK and EU, we have preserved these official workshop manuals and owners books to ensure access for the community.

Model Identification & Technical Data

Whether you are tuning carburettors on a Gen 1 silver-engine model or diagnosing a Delphi EFI system on a newer black-engine 250cc, identifying your generation is key:

  • GT125/250 (1998–2008): Silver engine, Mikuni Carbs, “Old Shape” (Gen 1).
  • GT125/250 RC & P (2009+): Black engine, Facelifted bodywork, Carburetted or EFI.
  • EFI Models (2008+): Features an O2 sensor in the exhaust downpipe and 28hp DOHC V-Twin engines.
  • Maintenance: All models feature the iconic 75° V-Twin DOHC 8-valve architecture.

For more details, see our Pre-2009 (Gen 1) Wiki or the Post-2009 Facelift Gallery.

Carburetted (Carby) Models


⬇ OWNER’S MANUAL – GT125/250 [Gen 1]


⬇ MANUAL – GT125/250 [Facelift & Hybrid]

Electronic Fuel Injection (EFI)


⬇ EFI SERVICE MANUAL – GT250 & GV250

Need Help? If you have technical questions, please visit the Technical Help Forum.

[DOWNLOAD] Service Manuals & Owners Books – Hyosung GV650 & GT650 (Carb & EFi)

Hyosung 650cc V-Twin Master Resource

Welcome to the complete documentation archive for the Hyosung GT650 (Comet/R/S) and GV650 (Aquila/Avitar). These 650cc machines are the powerhouses of the Hyosung range, featuring the iconic 90° V-Twin DOHC engine. Whether you are synchronising carburettors or diagnosing a Delphi/Denso EFI system, these permanent direct links provide the official data you need.

650 Series Generation Guide

Identifying your specific 650 model is critical for correct electrical and fueling maintenance. The GT and GV series evolved through several major technical phases:

  • Carburetted (2004–2008): Features dual Mikuni carburettors and the classic “silver” engine finish.
  • Gen 1 EFI (2008–2011): Transition to Fuel Injection. Uses the “S&T” or “Mitsubishi” marked systems with a green LCD dashboard on GT models.
  • Gen 2 EFI (2012–2018): Features a major visual facelift (RC for Sports, P for Naked) and the upgraded Denso/Delphi ECU systems.
  • 2024+ GV650 ABS: The latest revival (GV650PJ/PC) featuring full LED electronics and ABS. (Manuals pending; see specs link below).

Technical Note: The 650 engine produces approx 79hp (Carby) to 74hp (EFI) and requires 10W40 semi-synthetic oil (~3.0L with filter). For 2024+ models, visit our GV650 ABS Wiki & Specs Page.

🛠 WORKSHOP SERVICE MANUALS


⬇ SERVICE MANUAL – GT650 & GV650 (Carby)

⬇ EFI SERVICE MANUAL – S&T / Mitsubishi

⬇ FI SERVICE MANUAL – “Fi” Marked Models

⬇ EFI SERVICE MANUAL – Denso (2012+)

📕 OWNERS HANDBOOKS

Safety Notice: Ensure you are using the manual that matches your ECU type (Mitsubishi, Delphi, or Denso) to avoid electrical damage. If you have documentation for the 2024+ GV650 ABS models, please contribute by commenting below. All links are permanent mirrors hosted on the HyoRiders servers.