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Author Topic: GT650 S/R Lugging/Power Failure  (Read 3295 times)

TheEhTeam

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GT650 S/R Lugging/Power Failure
« on: April 12, 2017, 05:32:25 AM »

Hello everyone.

So for a while now my 2006 GT650R (20,000kms) has been acting up. For the most part it runs like a dream idles fine and runs great. However occasionally and more recently than ever it starts to jerk/lug and seems the pistons are firing irregularly. It can be extremely dangerous especially on a slow corner when the power lacks and picks up and lacks again kinda throwing you all over the place. The only quick fix I have is throttling up with the clutch in when I'm forced to go slow (traffic/corners). I feel like an a**hole doing that and obviously this is a sign there's something severely wrong in which I would not like to continue to cause harm.

Only happens once the bike has warmed up to normal operating temperature and then after highway riding (roughly say 10 min at 120km/h 7-8,000 RPM) then entering back roads for 10 min or slow moving traffic where I'm forced to go into 1st or 2nd gear with low RPM. Most times I've noticed it happen I was doing 30km/h in 1st gear around 3-4500 RPM. Recently it has also started in 2nd gear around 55km/h at around the same RPM.

Usually I can rev the RPM higher or lower gear to increase RPM and the problem vanishes (goes back into hiding). Lately if I increase the throttle a bit when its lugging it doesn't accelerate like it used to, kind of bogs a bit. So I have to really throttle it. At highway speeds and the back roads on the way to the highway in the morning it's fine. In fact it was fine for 3 days and then it started again and then it can be another couple days before it happens again. The temperatures seem normal, rarely goes into red and when it does the fan kicks it down again.

I have pulled the spark plugs and looked at them, they are covered in a light grey dust and seems right. I also pulled both carbs off and did a thorough cleaning finding little small particle debris in the floats. Ran great for a week until here the problem arises again. I also recently took my bike to the only dealer within 300km that will touch a Hyosung. The owner of the small shop who supposedly specialise in Hyosung and scooters told me he couldn't see any problems after a servicing. I had him ride the bike too and do a tune up just in case something pops up but the results were clean. He believed that my bike in particular was that of one of his apprentices from a while back who constantly kept it serviced before selling it to whom I purchased it from. It was in rough shape when I got it. Dead battery, faulty spark plugs, no front turn signals (cut actually), bad oil, little no coolant and brake pads down to the metal. I was angry as it's my first bike and he told me it was good to go for the season and ripped me off.

If you guys can help me out and or offer any suggestions on what it could be as well as ask any questions that hopefully I can answer so I can get one of the final problems with this bike figured out I would GREATLY appreciate!

Thank You,
TheEhTeam
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umop-ǝpisdn

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Re: GT650 S/R Lugging/Power Failure
« Reply #1 on: April 12, 2017, 10:13:42 AM »

G'day Eh!

Two thoughts.

The side stand safety switch. It's known to be an issue with these bikes. Try bypassing it and see if the issue resolves. To bypass, simply bridge the wires using a scotch lock.

The other thought is the ignition coils. My bike had a problem with the rear coil and it presented in it's early stages as low speed jerking.
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I used to be a sensitive, new age guy, but times have changed and now I am more of a caring, understanding, ninties type.

TheEhTeam

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Re: GT650 S/R Lugging/Power Failure
« Reply #2 on: April 13, 2017, 03:02:53 AM »

Thanks for the input, I'll check out both suggestions and see what I get. Can't until tomorrow late afternoon unfortunately. Now funny enough my bike has always been "lacking" a stand safety switch. It appears the last owner dealt with the switch in his own manner by removing it I believe. I found out the hard way when I accidentally rode with the kick stand down for a block or so finding out by making a turn. The ignition coils seems to be something that I see popping up a lot here and there. I'm just dumbfounded by why its only after the bike is warmed and almost runs perfect mid temp. Definitely feels like cylinder misfires or lack of firing so I'll check it out.
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TheEhTeam

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Re: GT650 S/R Lugging/Power Failure
« Reply #3 on: April 14, 2017, 05:15:17 AM »

G'day Eh!

Two thoughts.

The side stand safety switch. It's known to be an issue with these bikes. Try bypassing it and see if the issue resolves. To bypass, simply bridge the wires using a scotch lock.

The other thought is the ignition coils. My bike had a problem with the rear coil and it presented in it's early stages as low speed jerking.

Ok so I had some time to run some quick tests after work today. I pulled out both spark plugs and had a look at them, they both look exactly the same. As they were only installed new probably less than 2,500km ago (I have pictures of both just in case). Also checked for spark and both spark well. I also ran a multi meter on the ignition coils. With multi meter set to 200 ohms I was reading 4.8 on the coil assembly, from the boot to the coil assembly was a straight 1 for some reason no matter what I did (although the spark plugs were sparking when connected to the boots) and if I removed the boot and tried again from coil assembly to the wire the boot connects to on 20k ohm settings was receiving 19.98 which seems high. However front and rear coil assemblies were both very similar in results. I also ran a test on vacuum leak on the rubber hosing connecting the carbs to the cylinders using a chemical spray and RPM's never faltered or increased. So hopefully that rules out vacuum leaks unless I'm testing the wrong area. I did find the side stand switch covered in so much muck so it is still connected and not bypassed from previous owner to my knowledge. It was receiving voltage at the relay for the side stand switch. Not sure if that is what I should have been testing for. I didn't have time to take it for a ride and by pass to see if that altered performance so I will do so this weekend (but as the safety on the side stand has never actually functioned I'm not sure it's working further down the line). Oh yes and I also ran the bike for a bit and sprayed water on the exhausts from both cylinders and water evaporated what appeared to be equally. The bike does seem t run irregular more than ever before sounds as though the carbs are most definitely not in sync. I will make a manometer and sync them up, I tried once before and I could never get the water level to stop rising or falling from one or another bottle. At one point it did stop and I thought I had it but then it started to randomly shift to the other bottle before the bike died from lack of whatever when I have the tubes hooked up to the carbs. I'm not sure that non synced carbs if they even are are causing the problems that I seem to be getting. Also seems to be some nasty engine sounds. One is a metallic tinking that seems to go with RPM's located around the rear cylinder or crank case and another is a heavier metal thumping from front cylinder area.

Anyway I'll keep plugging away this weekend and let you guys know of any updates. Ideas welcomed and hopefully this can help anyone else out if they appear to have as many problems as I seem to.

Thanks,
TheEhTeam
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TheEhTeam

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Re: GT650 S/R Lugging/Power Failure
« Reply #4 on: April 15, 2017, 05:54:59 AM »

Update

The stand switch was by passed already by the previous owner and can definitely confirm no air leaks on the intakes.
Will be checking carb sync tomorrow.
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TheEhTeam

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Re: GT650 S/R Lugging/Power Failure
« Reply #5 on: April 16, 2017, 01:38:02 AM »

Got the carbs sync'd. Took it for a 1 hour to 1 hour and a half ride. Backroads to highway then highway to back roads. Died multiple times. In 2nd gear if the RPM's went under 7k it would violently kick and buck until I rev'ed the f**k out of it. Even then a lot of the times throttle response was non existence until I opened it up many times. It died twice trying to leave a busy 4 way. I feel as though the clutch being engaged has alot to do with it. Whenever I clutch in the violent jerking/bucking/misfiring or what have you goes away and it idles fine and doesn't die. A few times when it was jolting about I started to pull over and it just turns off. It was not overheating as it was still 2 bars below red and the few times it did get up to the red driving slow behind someone the fan kicked in. I sprayed seafoam over the intakes while it was hot to see if perhaps a leak was appearing with expansion and still did not affect the idle. I'm out of ideas.
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umop-ǝpisdn

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Re: GT650 S/R Lugging/Power Failure
« Reply #6 on: April 16, 2017, 04:17:13 AM »

I know the coils tested within spec, but you know it's the coils, right?
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I used to be a sensitive, new age guy, but times have changed and now I am more of a caring, understanding, ninties type.

TheEhTeam

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Re: GT650 S/R Lugging/Power Failure
« Reply #7 on: April 16, 2017, 06:00:49 AM »

I know the coils tested within spec, but you know it's the coils, right?

Is there anyway to find out which coil or should replacing both just go without saying?
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umop-ǝpisdn

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Re: GT650 S/R Lugging/Power Failure
« Reply #8 on: April 16, 2017, 09:53:58 PM »

Yeah, both.

Find some good, used SV650 coils if you can.
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I used to be a sensitive, new age guy, but times have changed and now I am more of a caring, understanding, ninties type.

TheEhTeam

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Re: GT650 S/R Lugging/Power Failure
« Reply #9 on: April 17, 2017, 12:27:23 AM »

Thanks for your help
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