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Hyosung gt125r will not spark

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Aidan davie6329
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Joined: 11 Jul 2019
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PostPosted: 16:35 - 11 Jul 2019    Post subject: Hyosung gt125r will not spark Reply with quote

Hello, I have a Hyosung gt125r, have had a few problems with this 11 plate recently but all have been fixed over time, I had a problem where the battery was not charging and I was having to trickle charge every couple of days over night as I was looking for a new rectifier for it, the battery died on my way home one night and I was close to home so I pushed it back to my garage and then a few days later I tried to start it and it wouldnít work.

Iíve taken the battery out and moved the cdi to charge the batt but other than that nothing has been changed, now the bike will not spark, battery is fully charged and Iíve even bought a new cdi unit but still no spark, coils and plugs have been changed and everything else works on the bike perfectly, the neutral sensor is fine, the clutch and side stand sensors/wires have been removed but has been done right, can someone please help me out
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Last edited by Aidan davie6329 on 17:40 - 11 Jul 2019; edited 1 time in total
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Easy-X
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PostPosted: 17:00 - 11 Jul 2019    Post subject: Reply with quote

Brace yourself for old nannas knitting jackboots: yes the grammar Nazis will be on their way...

Bit confused the sensors are all fine but they've been removed?! Which is it?
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Last edited by Easy-X on 00:12 - 12 Jul 2019; edited 1 time in total
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Aidan davie6329
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PostPosted: 17:41 - 11 Jul 2019    Post subject: Reply with quote

I have amended the first post haha, the neutral sensor is fine but the side stand and clutch have been correctly removed so that no wires are left that could cause it to possibly not spark
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Easy-X
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PostPosted: 00:15 - 12 Jul 2019    Post subject: Reply with quote

All I can think of is maybe a loose wire somewhere that you disturbed taking the battery out. After that it's time to break out the multimeter.
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Aidan davie6329
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PostPosted: 01:58 - 12 Jul 2019    Post subject: Reply with quote

Iím waiting till the weekend as my friend has a decent one but if it still doesnít work with finding the possible problem with that (I hope I do find it) then I think Iíll be doing an engine change on Monday and then a wiring loom change if needed, at this point I cannot see the problem, all wires look to be in decent condition but the stator is stuck so if itís that then Iíll change the engine as I know someone with one with a new stator coil in it, just thought Iíd post it on here to see if anyone else had a similar problem haha Smile
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pepperami
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PostPosted: 08:13 - 12 Jul 2019    Post subject: Reply with quote

The side stand sensor can cause a few issues, mine did.
I cured mine by putting the wires back in place and instead of connecting them to the sensor, I made a loop.

Not had a single problem since Thumbs Up
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bikenut
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PostPosted: 09:43 - 12 Jul 2019    Post subject: non start Reply with quote

Get a wiring diagram and manual, there is probably one on here.

Study the wiring diagram and go from there.

You say the battery charging system was not working properly, due to corroded wiring connections??

have you had any problems with say the neutral light flashing on and off when turning the steering from lock to lock, or perhaps the brake light/tail light/horn doing similar odd stuff??

Been doing and frame painting at all??
and how is the earth and any fuses etc..

get a wiring diagram and manual.

you have multimeter or similar, even a cheapo one?
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Aidan davie6329
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PostPosted: 12:02 - 12 Jul 2019    Post subject: Reply with quote

The side stand and clutch sensors are fine, they havenít affected anything before and Iíve cleaned and checked all connectors. Iím awaiting on a diagram being sent in the post from hyosung themselves at the moment as I called the other day. No there isnít any corroded wires from what I can see but Iíve got another loom if mine isnít in good shape after checking it with a multimeter, yes the neutral light does flick on and off but not when the steering is locked, itíll do it when I turn the bike off after a long day of riding and then turn it on the next but thatís due to a dodgy earth which Iím looking to sort out though it isnít the problem with the spark plugs as itís been like this for ages and the spark plugs have still sparked, the tail light and everything else works perfectly, no problems whatsoever with the other electrics, recently got a new battery for it so itís not that, Iím not sure on anything else really, I just donít understand how the bike works one day then a couple of days later it just decides not to start, replaced coils and spark plugs yet still no spark, the fuses are fine, Iíve checked them out and the battery not charging was an issue with a loose wire to the rectifier that is now fixed but not sure if the battery is charging now or not as I havenít ridden it since this has happened haha so until I get a multimeter I wonít know
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Sister Sledge
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PostPosted: 13:32 - 12 Jul 2019    Post subject: Reply with quote

Remember though that the side stand sensor could be perfect but with a little age the actual sidestand becomes looser or freer to move. If that road is slightly bumpy it causes a slight misfire with each bump you go over as the stand moves and kills the engine for a brief moment.
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Aidan davie6329
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PostPosted: 14:04 - 12 Jul 2019    Post subject: Reply with quote

The side stand isnít a problem bud, the springs are tight but even still, the wires connecting the sensors have been cut and tied together so itís always on and Iíve checked over them and theyíre still fine bud
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Sister Sledge
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PostPosted: 15:12 - 12 Jul 2019    Post subject: Reply with quote

Aidan davie6329 wrote:
The side stand isnít a problem bud, the springs are tight but even still, the wires connecting the sensors have been cut and tied together so itís always on and Iíve checked over them and theyíre still fine bud


Ah OK flower x
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Aidan davie6329
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PostPosted: 16:19 - 12 Jul 2019    Post subject: Reply with quote

The problem I have isnít that it cuts out every now and again, itís that the spark plugs arenít getting any power to them or at least theyíre not sparking at all, the engine just wonít start, if it cut out every now and again I could see about sorting that but the problem as currently is that it wonít start at all buddy
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pepperami
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PostPosted: 17:58 - 12 Jul 2019    Post subject: Reply with quote

No spark.
Ok, work backwards and cheapest options first
Plugs = try them in a different engine.
Plug caps = are they loose?
HT leads = as above/have they broken down
Coil/s = take them/it to be tested.

After that itís the back box & ignition barrel.
What about the sensor on the alternator flywheel?

Thatís what Iíd be looking at and using a process of elimination.
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Sister Sledge
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PostPosted: 19:44 - 12 Jul 2019    Post subject: Reply with quote

This ^^
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bikenut
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PostPosted: 10:00 - 13 Jul 2019    Post subject: non starter Reply with quote

is it parked in the dry?
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Aidan davie6329
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PostPosted: 13:05 - 13 Jul 2019    Post subject: Reply with quote

Things that have been replaced for new or have been tested and are fine:

Both coils, leads that go into the spark plugs and spark plugs, the back box and ignition barrel have been replaced although they were tested and fine, have no clue about the stator till tomorrow as I donít have my multimeter at this time but itís looking like that may be the issue, yes it was kept in the dry which is why it puzzles me why it no longer works after doing nothing hahaha, Iím looking at an engine change as the bolts to the stator are rounded off pretty bad whereas the stator in another engine that my friend has is in mint condition, thanks guys
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