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Author Topic: GT650 I naked (EFI) Misfiring drives on 1 cylinder?  (Read 218 times)

Lassen88

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GT650 I naked (EFI) Misfiring drives on 1 cylinder?
« on: August 06, 2018, 10:52:30 AM »

Hello Everybody :) ,

Thanks for letting me in to this forum,

Well i have a hyosung 650 i NAKED in EFI (the bike is year 2009/2010 ) ,

It has run very great for a while, but now the bikes is start to misfirring?,

The bikes run and idle fine, but have only the third of what is shuold have in power?, and the bike is only run on 1 cylinder?,

Ive checked the OHM in the Coils, look fine, (they look equaily) and ive just changed spark plugs.

But that did not seeme to Work out the problem - the diplays show no fault codes,,,

And its both when its Cold and warm, make no big difference

Ive checked many threads about this, some wrote about adjusting the tps? and others about ignition coils from a SV650 -,

Someone that had has the same issues? 

Thank you very much boys,

Greetings from Denmark :)
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spit051261

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Re: GT650 I naked (EFI) Misfiring drives on 1 cylinder?
« Reply #1 on: August 06, 2018, 11:03:25 AM »

Sounds like you may have lost a feed to one of the coils or a return cable to the ECU from the one that is misbehaving if the HT side is OK .
Check both coils and make sure you have 12V on one side of the coil on both of them .
If you have , you may have lost one of the returns to the ECU .
The feed on both coils is common and is OB .
The returns are -
Rear coil  is WL wire to ECU pin 53
Front coil is BY wire to ECU pin 18
The ECU switches negative .
The odds are though it's on the HT side if it's not firing and after checking your feeds you could just pull the spark plug out , ground it on chassis and see if you have a spark .
If it's not sparking after proving everything else , look at the coils and HT leads .
It's electrical I would say .
« Last Edit: August 06, 2018, 11:15:26 AM by spit051261 »
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Lassen88

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Re: GT650 I naked (EFI) Misfiring drives on 1 cylinder?
« Reply #2 on: August 06, 2018, 11:33:54 AM »

Thank you very much for answer :) ,

Yep its defintly electronics,

So i would have to check the wiring and the coils?, and that shuold be 12 DC? but how can i messaure withstarting the bike, and what is HT?,

Thank you
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spit051261

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Re: GT650 I naked (EFI) Misfiring drives on 1 cylinder?
« Reply #3 on: August 06, 2018, 12:13:15 PM »

Yes , it is a 12 volt DC system .
The HT is the high voltage side of things so be a bit careful .
It works by collapsing a DC field of a coil (ignition coil) on itself and this produces a very high voltage (Kilo Volts) . It does this by switching it on and off and this baby gives you your spark to ignite the fuel in the piston chamber .It gets boring then regarding back EMF and the like  ::)
Anyway , just take spark out , lay the outer part on earthed meat ( eg chassis , frame but make sure it's clean metal and not painted) and you should see a big spark coming from it when you turn the engine over.
You should have a feed on one side of the 2 ignition coils with just the ignition on and you can check this with a multi meter set for DC volts or a 12V test light but check it to ground and not the other coil connection (which goes through the ECU) .
Or...you could just quit while you are ahead and get someone else to check it out that understands low voltage electrickery on automotive systems  ;) .
You could make things worse if you don't know what you are doing as well as hurt yourself and we don't want that .
« Last Edit: August 06, 2018, 12:52:29 PM by spit051261 »
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Lassen88

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Re: GT650 I naked (EFI) Misfiring drives on 1 cylinder?
« Reply #4 on: August 13, 2018, 09:52:49 AM »

Hello Once again,

Ive now tried with 2 new spark plugs and nothing is changed, the bike i misfirring and only runs on 1 cylinder,

So would you recoomend that ive change the ignition coils? ,

Thank you
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umop-ǝpisdn

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Re: GT650 I naked (EFI) Misfiring drives on 1 cylinder?
« Reply #5 on: August 13, 2018, 10:15:31 AM »

Lassen88,

I also think it's probably something wrong with the coils.

Is one exhaust hotter than the other? Spray some water on them and see how long it takes to evaporate.

If one is hotter than the other, then swap the coils. Does this change which cylinder is hotter?

If so, then the cold side has your faulty ignition coil.
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spit051261

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Re: GT650 I naked (EFI) Misfiring drives on 1 cylinder?
« Reply #6 on: August 13, 2018, 02:44:38 PM »

Sounds like you may have lost a feed to one of the coils or a return cable to the ECU from the one that is misbehaving if the HT side is OK .
Check both coils and make sure you have 12V on one side of the coil on both of them .

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umop-ǝpisdn

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Re: GT650 I naked (EFI) Misfiring drives on 1 cylinder?
« Reply #7 on: August 13, 2018, 09:46:18 PM »

Spitty,

Maybe, but the coils are quite famous for shitting themselves.
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spit051261

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Re: GT650 I naked (EFI) Misfiring drives on 1 cylinder?
« Reply #8 on: August 14, 2018, 06:43:09 AM »

Probably is a coil but nothing wrong with eliminating the feeds first and then checking coil resistance.
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