korider.com | Hyosung Motorcycle Owners Forum

korider.com | Hyosung Motorcycle Owners Forum

  • January 19, 2019, 10:12:37 AM
  • Welcome, Guest
Please login or register.

Login with username, password and session length
Advanced search

News:

Welcome to Korider.com!

Pages: [1] 2

Author Topic: RESOLVED - 2010 GT650R EFI Misfire when hot at low revs - RESOLVED  (Read 4157 times)

meadx001

  • Training Wheels
  • *
  • Offline Offline
  • Posts: 8

Hello All,

I have recently bought a Hyosung GT650R EFI.
It has been running really well up to now. Total of 500 k's on the clock and when the bike is idling it is misfiring continually.

As soon as I am over 3000 rpm it's fine. But even at higher revs with the the throttle constant it's not as smooth as I would expect.

Has anyone resolved this in the past? Any ideas appreciated
 8)
« Last Edit: February 22, 2011, 04:16:21 AM by meadx001 »
Logged

Register and log in and the Ads below will be gone! :D

BikeBandit.com

holodigm

  • Training Wheels
  • *
  • Offline Offline
  • Posts: 18
Re: 2010 GT650R EFI Misfire when hot at low revs
« Reply #1 on: February 15, 2011, 01:42:03 AM »

Hi mate, have a look through http://korider.com/index.php?topic=15117.0
There's a range of info/opinions on the new EFI idling and low revs.
Logged

CodeMonkey

  • I'll pretend I wanna be here.
  • Goodbye chickenstrips!
  • ****
  • Offline Offline
  • Posts: 419
    • My general photo blog - minus words...
Re: 2010 GT650R EFI Misfire when hot at low revs
« Reply #2 on: February 15, 2011, 02:20:03 AM »

My bike has the exact same issue. When hot it idles roughly and you can hear it misfire. Get's worse with more heat. Eventually my bike cuts out.

But yeah when it misfires it sounds terrible. Very clunky sound.

My 2010 efi gt650r has done it since day 1. 22,000km later it is still there. I've ruled out charging system. Next things to check for me are the sensors in the airbox and the TPS.

Please let us know if you dealer can work out what causes it!
Logged

Ghost_Rider

  • Goodbye chickenstrips!
  • ****
  • Offline Offline
  • Posts: 195
Re: 2010 GT650R EFI Misfire when hot at low revs
« Reply #3 on: February 15, 2011, 03:38:23 AM »

I remember I was told or read it some where that the 650's drop the back cylinder on idle and pick it back up at around 1700 or something.
Logged
2010 GT650R EFI, Double bubble screen, Rear Hugger, LED indicators
Leo Vince slip on can, HEL braided lines, tribal rim tap, black anodised levers, Pro Bolt fairing bolts, 6000k HID lights, AIS block off, Iridium plugs

stigger

  • Global Moderator
  • Forum Addict
  • *****
  • Offline Offline
  • Posts: 4227
Re: 2010 GT650R EFI Misfire when hot at low revs
« Reply #4 on: February 15, 2011, 04:11:05 AM »

I've read that too, doesn't sound right though...
Logged

Alantris

  • Grinding the pipes
  • *****
  • Offline Offline
  • Posts: 1022
  • Life is just another ride home
Re: 2010 GT650R EFI Misfire when hot at low revs
« Reply #5 on: February 15, 2011, 04:13:11 AM »

I have a friend who makes AFC, and is an efi tuner, he told me, the hyo needs better MAP / MAF? or something like that, and the O2 as well, he said those sensors in the Hyo is just , well, cheap. He told me Honda something2 has the same issue before which he fixed using resistors? I'm really out of date, don't know much about efi.
Logged

CodeMonkey

  • I'll pretend I wanna be here.
  • Goodbye chickenstrips!
  • ****
  • Offline Offline
  • Posts: 419
    • My general photo blog - minus words...
Re: 2010 GT650R EFI Misfire when hot at low revs
« Reply #6 on: February 15, 2011, 04:14:15 AM »

Yeah I've read that somewhere and I thought it didn't sound right...it misfires every couple of seconds - making a nasty clunky noise each time..  

Something wrong with the lower rpms on the efi bikes. It's perfect above 2krpm.
Logged

holodigm

  • Training Wheels
  • *
  • Offline Offline
  • Posts: 18
Re: 2010 GT650R EFI Misfire when hot at low revs
« Reply #7 on: February 15, 2011, 06:04:40 AM »

I was talking to the guys in the shop today and it's usually a combination of the TPS and a bad mapping in the ECU.
I'm up for a service soon so I'll let you know how it goes.
Logged

hotdiggerty

  • Grinding the pipes
  • *****
  • Offline Offline
  • Posts: 1372
  • red is faster.
Re: 2010 GT650R EFI Misfire when hot at low revs
« Reply #8 on: February 15, 2011, 06:21:15 AM »

I have a friend who makes AFC, and is an efi tuner, he told me, the hyo needs better MAP / MAF? or something like that, and the O2 as well, he said those sensors in the Hyo is just , well, cheap. He told me Honda something2 has the same issue before which he fixed using resistors? I'm really out of date, don't know much about efi.
;)

          help-ful post alantris, can you suss out some more info from your friend? he seems to me the MAN. resistors eh,i wonder where and how they are set up? hope-fully he has some fixes here. i wonder if a retro-fit of a jap. make is possible with the sensors,spose the mapping is still the prob. there too? good work mate,up-date please. adios compadre.
Logged
DO IT NOW BEFORE IT BECOMES ILLEGAL !

08 gt650-s  stock- 13500ks 25/2/11

benk

  • Regular rider
  • ***
  • Offline Offline
  • Posts: 108
Re: 2010 GT650R EFI Misfire when hot at low revs
« Reply #9 on: February 15, 2011, 08:07:49 AM »

I have a friend who makes AFC, and is an efi tuner, he told me, the hyo needs better MAP / MAF? or something like that, and the O2 as well, he said those sensors in the Hyo is just , well, cheap. He told me Honda something2 has the same issue before which he fixed using resistors? I'm really out of date, don't know much about efi.
;)

         . resistors eh,i wonder where and how they are set up? hope-fully he has some fixes here. i wonder if a retro-fit of a jap. make is possible with the sensors,spose the mapping is still the prob. there too?

We used to use resistors on some race cars that had to run the factory ecu and factory tune to try and gain a bit of extra hp. By using them you are tricking the computer in to thinking the the sensor is giving a different reading then it really is. Obviously for variable resistance sensors.
Logged

Pages: [1] 2