Topic Tag


Feb 10, 2023

2012 GT650 de-restrict

Looking to de-restrict a 2012 GT560 EFI model, have heard that an ECU remap is needed after the bracket has been removed from throttle body. Is this needed or is the mechanical mod enough?

Mar 23, 2022

Oil change, front fork

Hyosung GT650 Comet-06
Hi there.
With empty tubes, front fork manual tells:
“Oil level 146mm (5.8 in) from end of outer tube
(when maximum compressed without spring)”
or/and 380 cc.
The recommended level is obtained with 380 + 60 cc at each leg.
Anyone who can explain ‘wass’up’?
The hight of inner thread, from top to ‘top of outer tube’ (oilfilled) is 25 mm. So measure top(top) 😋 to oil is 171 mm.

Jan 21, 2018

[Bike Mod] 650/250/125 – AiS Block Off Removal (EGR Delete)


I did not write this , but give credits to the lad who made this book (below).
(BTW, follow at your own risk!)

Benefits, The Proofs, etc..:
Aimed at 650cc bikes but also same method for smaller CC bikes.   

So basically , deleting the AIS (EGR block) from the bike is immediately obvious by:

  • Popping Stops (Loud bangs on the exhaust pipes)
  • Much deeper groans on idle  (louder induction roar)
  • Bike is able to run better from 4-7k rpm (especially low CC bikes)]
  • For Stainless pipes , it’s advised to remove it anyway!
  • It’s 1st the thing race teams do, ditch parasitic parts.
  • Bike is overall louder (marginally than before)


What is AIS (Incorrectly named EGR by the uneducated mechanics)

  • It makes the bike “fake” its emissions by burning cleaner air to pass Euro laws.

Thats it!

  • It has NEVER proven to benefit bikes, actually it “steals” the energy from the bike to run it.
    It’s a like a “Remora” creature under a shark, as it migrates all over the seas 😉


Dec 28, 2017

[Bike Mod] GV650 & GT650 : Modification of the TOS sensor (Tip Over Sensor Mod)

I did not write this , but give credits to the lad who made this.
(BTW, follow at your own risk!)

Quote from book :

The TOS sensor, the same in the GT650 and GV650, turns the ignition off when an emergency happens
such as excessive tilting or the tipping over of the bike. If the sensor is not working it will create a situation
whereby after a short time of about 2 seconds after the ignition is switched off the injection pump is disabled
and you cannot fire up the engine.
When this happens, the display will always show an “FI” error. When this happens the sensor should be
checked. Put the bike into service mode. There should be displayed error c23. This means that the sensor is
faulty and needs replacing. If there is any problem with buying a new sensor, or the price of about $ 100 is
too high, you can hand-edit the faulty sensor for the engine to run properly not display FI error. The cost of
modification is only the purchase of two resistors in the price of .30₵ – .40₵ cents. The only drawback of this
modification is that if you tip over the bike while running, the ignition will not be stopped.

📕 DOWNLOAD / VIEW  – 650cc Twins – Tip Over Sensor Mod (.pdf)

Dec 17, 2017

[DOWNLOAD] Service Manuals & Owners Books For Hyosung GV & GT650 – Carby & EFi

[DOWNLOAD] Service Manuals & Owners Books For Hyosung GV & GT650 - Carby & EFi
Life should be easier for us all ey ?

Below, you will find permanent direct links to all Hyosung 650 service manuals
(Stored on this site)

Click the links & read on! ⤵️

📙 GT650 & GV650 (All Carb Models) SERVICE MANUAL (PDF)


📙 GT650 & GV650 – EFI –  “S&T” Electronic Injection Models
Includes GV650Ei/GT650/GT650S/GT650Ei Bikes


📙 GT650 & GV650 – FI –  (EFI) “Mitsubishi” Injection Models
Includes GV650-Fi , GT650-Fi-Comet , GT650R (&GT650S) – “Fi” marked bikes.

More books below ⤵️