Reply To: GT650 Comet EFI 2010; Stalling issue at idle after revving

Mar 31, 2022 at 4:22 PM #7231

Tom

Member

Topics: 9
Replies: 49

@kernow

Cornwall

GV125

I do not have a 650 but went off and did some reading on it and this problem. It seems that the ECU was changed in 2009/10 and the 2010 can have the issue you describe. I have read of ECUs being returned and reprogrammed but with no help to the bikes stalling issue. People also seem to of replaced rectifiers etc to no effect. My gut would say a sensor failing making ECU compensate.

I noticed that you have no FI light come on.

A couple of people solved it by replacing the throttle sensor.

Hopefully Marcel sees this and has an answer for you, he really does seem to have a vast knowledge of Hyosung’s little hickups.

Here is a Netrider forum post that looks at your issue, same bike same year; https://netrider.net.au/threads/2010-hyosung-gt650-misfire-and-stalling-when-hot.111646/#p-body-main (I imagine that you have already read it).

Good luck and keep us informed. If I find any actual useful info I will post it.