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1
GT650 / Is it the ignition coil?
« Last post by emilbang96 on Today at 07:45:05 PM »
Hey fellow riders

I am the (un)lucky owner of a Hyosung GT 650 FI from 2008.

The last couple of months I've been experiencing a couple of problems with my bike. When letting of the gas the bike pops a lot, but that's probably from the exhaust not being with a DB killer and/or wool. When I've been driving for 10 minutes or more, it starts misfiring and stalling when coming to a stand still. Some times it feels like I'm driving on a single cylinder when accelerating. I have just disassembled the fuel items on the engine and inspecting them and cleaning them. No visible leaks, cracks or other things that could be the culprit. When applying the gas in neutral it doesn't keep the revs at the same level. The revs keeps going up and down even when giving the same amount of gas.

The spark plugs are new and inspected with no faults.

I was wondering if it could be the ignition coils?

Please help me figure it out

Regards, Emil
2
It seems like we have the same problem. My bike cuts out after revving and its sounding like a clonk from a cylinder. I am getting a new ignition coil. Just changed the spark plugs and disassembled all the fuel related things in the engine. No visible trouble - why I am wondering if the electronics are good
3
GT650 / Re: FI FAULT codes 0351 and 0352, gt650r, advice pls?
« Last post by GhostInTheHyo on March 01, 2021, 08:54:50 PM »
Okay... some progress.
Bad luck finding spark plug cables. out of stock nowhere to find in this country, gonna have to import some.

But I disasembly the fairings and airbox in order to remove the front coil and sparkplug and found something very interesting, can't be coincidence...

Removed the coil and inspecting it found this mark like some little burnt or melt:

pic1:


Then checked if that side was touching something and in fact was touching this harnessed cables, and the exterior cover melted:

pic2:


Unwrapped the melted tape/cover and the blue cable seems to be the most affected but looks only superficial, a flat spot where they were touching.

pic3:


Now im thinking: the coil heat melt it or in fact the coil insulation failed and an arc was formed there jumping to the cable generating the fault?

So now I measure the coils, spark plugs and cables and seem to be ok in resistance at least....
spark plugs looked ok but front one had little carbon flash-like near the connector on the ceramic, not much tho...

Measurments:


If I get this values this does not mean that they are in fact good right? it may have insulation problems to the outside where the cable insulation melt? too much coincidence?
So... im going to swap the coils front and back, and try the front placed one don't be in touch with cables again.
Now im going to wrap the cables and everything and try riding to replicate the fault with the coils swaped.

update:
ok went to a ride and the bike fails the same way. I dont know if placebo or not but i feel it runs gradually worse, and smells more fuel exhaust fumes.
Only option now is to replace the coil.
4
GT650 / Re: FI FAULT codes 0351 and 0352, gt650r, advice pls?
« Last post by GhostInTheHyo on March 01, 2021, 01:29:59 AM »
Main relay may be faulty, this provides power to the coils.

Coils primary winding resistance 0.52 - 0.64 ohm
Tested at the pos and neg coil terminal.

Coil secondary winding resistance 6.4 - 7.8 k ohm
Tested from end of plug cap to pos terminal of coil.


Either way a new relay is cheap.
A second hand coil off a 250,650,700 delphi bike is cheap also.
Check the harness from both coils back to the main relay for any breaks also.

this is for the delphi coils too?
2 pins =[  ]- pin to the plug cable
between the 2 pins gave me ~0,8 and i remember trying the combinations with the end pin giving me infinite (?)... this is on the rear coil, gonna try again tomorrow.

Also, i swaped the MAIN RELAY with the FUEL PUMP RELAY since they are the same and the bike behaves the same, fault at high rpms. So relay is good.

Tomorrow when changing the plugs cables im going to check thoroughly for damage on harness and what not. Front coil and plug have not been visually checked yet.
5
GV650 / Little bulb in lamp globe.
« Last post by Edber on March 01, 2021, 01:20:51 AM »
Hi,can someone please tell me what is the purpose of the little bulb underneath the main bulb in the headlight globe,i cant get it to light up on its own.It comes on with the low beam upon starting the bike or am i missing something?.
6
GT650 / Re: FI FAULT codes 0351 and 0352, gt650r, advice pls?
« Last post by HyosungPerformanceTuning on March 01, 2021, 12:03:14 AM »
Main relay may be faulty, this provides power to the coils.

Coils primary winding resistance 0.52 - 0.64 ohm
Tested at the pos and neg coil terminal.

Coil secondary winding resistance 6.4 - 7.8 k ohm
Tested from end of plug cap to pos terminal of coil.

Either way a new relay is cheap.
A second hand coil off a 250,650,700 delphi bike is cheap also.
Check the harness from both coils back to the main relay for any breaks also.
7
GT650 / Re: FI FAULT codes 0351 and 0352, gt650r, advice pls?
« Last post by GhostInTheHyo on February 28, 2021, 06:11:03 PM »
Right now I have strong suspicions about the plug wires. If arcs jump outside the insulation could explain some rough acceleration and ecu thinking coils are bad.  Monday will try to find good ones.
8
GT650 / Re: FI FAULT codes 0351 and 0352, gt650r, advice pls?
« Last post by GhostInTheHyo on February 28, 2021, 05:38:07 PM »
The chances of a delphi coil failing is pretty low. The chances for 2 at the same time, 1 in a million.

I suspect it's low voltage under load related.
Check your battery voltage at idle and 5k rpm.
Check your rectifier plug. Has 3 yellow wires.

alright, I measured the voltage from battery terminals:

the battery is a yuasa, changed it more than a year ago.

with cold engine:
OFF --- 12,6v
ON  --- 12,3v
Idle --- 14v

after 5 minutes warming idling:
idle --- 14,2v
5000rpm --- 14,4v

Then checked the connectors of the voltage regulator, they looked clean on the leads, from outside the plastic had a little corrosion remnants from old battery liquid splashes.
I reconnected and went for a ride to replicate fault and it fails exactly same way.

After arriving i measure again and got:
OFF --- 13v
ON  --- 12,8v
idle --- 14,2v
5000rpm --- 14,4v

9
GT250 / Re: secondhand bike, GT250nake vs GD250n
« Last post by HyosungPerformanceTuning on February 28, 2021, 12:21:56 PM »
You can do both.
Find a 2013+ gt250r. Problem solved.
10
GT650 / Re: FI FAULT codes 0351 and 0352, gt650r, advice pls?
« Last post by HyosungPerformanceTuning on February 28, 2021, 12:17:28 PM »
The chances of a delphi coil failing is pretty low. The chances for 2 at the same time, 1 in a million.

I suspect it's low voltage under load related.
Check your battery voltage at idle and 5k rpm.
Check your rectifier plug. Has 3 yellow wires.