Question about 2003 Hyosung RX 125

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Ok i have a like 1995 or newer hyosung 950 ml. 4 valve and im not getting a spark to the spark plug...

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  • joe May 11, 2010

    have you tried a new spark plug?

    key is on and engine kill switch is off, right?

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  • Master
  • 2,559 Answers

Test the Stator for power and replace if needed.

Replace the CDI .(this is more than likely your problem)


Please rate this a fixya

Posted on Feb 03, 2009

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My 2002 Hyosung 125 won't Rev over 5000rpm under load


Hi, Kevin and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Spark plugs in bad condition or partially fouled.
4. Spark plug cables in bad condition and leaking.
5. Spark plug gap too close or too wide.
6. Faulty ignition coil, module, and or sensor.
7. Loose, dirty, or corroded ignition module connector at crankcase.
8. Faulty CKP or CMP, MAP, ETS, ATS, TPS, O2 sensor.
9. Intake air leak.
10. Water, dirt, or rust in the fuel system, carburetor and/or filter.
11. Fuel tank vent system plugged or carburetor vent line closed off.
12. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
13. Carburetor controls misadjusted.
14. Damaged carburetor.
15. Incorrect valve timing.
16. Weak or broken valve springs.
17. Damaged intake or exhaust valve.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
http://www.xs11.com/forum/showthread.php?t=41161
Thread Help Shiver engine misses above 5 000 rpm and won rev past 6 000 rpm
NEED HELP WITH DNA 50 AGAIN
http://files.hyosungmotorsusa.com/GT125_250_Service_Manual.pdf

May 03, 2016 | Hyosung Motorcycles

1 Answer

Have a 2007 Hyosung gv650


Hi, Dwight and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Discharged battery, check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
8. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
10. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2 and/or BAS).
11. Security alarm needs a reset.
For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have a nice day.
http://www.alternativecruisers.com/index.php?topic=21631.0
http://korider.com/index.php?topic=13441.0
http://www.hyosung.hu/download/pdf/data/service-manual/GT650%20EFI%20GV650EFI%20Service%20Manual.pdf

Feb 20, 2016 | 2007 Hyosung Avitar GV650

1 Answer

My Bike is turning over, but there's no Spark (Hyosung GV125) Replaced CDI, Regulator, fuses, what is my problem?


Hi Bradley, if you have a CKP sensor it needs compression to send correct signal to the ICM/ECM, make sure both spark plugs are in heads and use a grounded third plug to check for spark or hold spark plug cable close to spark plug in head. If still not getting spark the usual suspects are:
1. Fouled spark plugs.
2. Battery voltage below 8.7 volts, loose or broken battery cables, check the "NEGATIVE" cable at both ends.
3. Loose connection at ignition coil or plug between ignition sensor and module.
4. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose.
5. Faulty ignition coil or ignition / electronic module
6. Failed CKP, CMP, MAP or BAS sensor.
7. Faulty ignition switch.
8. Security alarm failing to disarm.
For more information about your issue, please visit the websites below. Good luck and have a nice day.
Hyosung GV125 Service Repair Manual

Oct 15, 2015 | Motorcycles

1 Answer

Bike turns on fine runs well but does not have power, deos not have the speed its had a few days ago. barley goes passed 40mph unless down hill. hyosung 650 07


check air filter, spark plug and fuel delivery in that order. then check for plugged exhaust, valve adjustments and then timing. in the mean time answer these questions. is the gas fresh and from a known good source ??? did you do anything to it recently ??? is the engine revving high while you are moving ???

Nov 27, 2013 | Hyosung Motorcycles

1 Answer

Hyosung ms3 250 battery fully charged engine turns over wont fire up also new spark plug fitted


has spark? has fuel going to carb? if you smell gas from the muffler or carb then it not burning check for spark pull plug touch away from the hole so you don't ignite the vapors on the engine look for a great blue red spark

Feb 24, 2013 | 2009 Hyosung MS3 250

1 Answer

Got a hyosung gv250 that wont run..just cleaned the carbs and fuel is making it to the carb...im thinkin it could be it not getting spark...any ideas?


Not sure if this is still an issue as it's an old post but have you tried checking for a spark?

-Take your spark plug out,
-attach the ht lead to it,
-Hold it with a pair of INSULATED pliers so that the metal tip of the spark plug is earthing by touching it to some bare metal e.g. the cylinder head,
-Crank the engine and look for a spark. (Be careful about earthing it near the hole in the head where the spark plug fits as there may be petrol vapour present which may ignite).
Do this for both cylinders

Apr 25, 2010 | 2002 Hyosung GV 250 Aquila

2 Answers

My 2008 hyosung gt250r doesnt start, all light and horn works. any solutions


does it crank over?....if so check spark...fuel...etc...try to narrow it down to a actual problem such as carbs clogged, or injector not working, other than wont start, not able to tell much from that.

Sep 11, 2009 | 2005 Hyosung GT 250

3 Answers

Gv 250 wont stay running


read my solutions on this site for clogged carbs.....Tim

Jun 01, 2009 | 2002 Hyosung GV 250 Aquila

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