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Hyosung 650 ignition break down 5500 rpm

Hi. I have purchased 2005 Hyosung GT650r as a wreck for a project. After 8 months of replacing most bits the bike runs fine until it gets to 5500 rpm. At this point it coughs and splutters and will rev no further. I thought the low cost elimination process would fix this so: I replaced the spark plugs. No good. I replaced the coils, leads and plug cap. No good. I replaced the CDI unit. No good. I upgraded the main and slow jets along with checking the float level. No good. The bike seems to be well made except for the frame paint job and parts are one third the cost of my Suzuki VX800. So I believe it's worth finding this one glitch which I'm sure others are pulling hair over as well. All parts were replaced with factory new. Your ideas are most welcome.

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: Power restrictor

Replace carb slides. Order the parts from hyo dealer. Remove carbs. Take out old slides and replace with new ones

Posted on Nov 10, 2008

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SOURCE: my keeway wont start

Check the fuses. Is the kill switch on or shorting out? Disconnect it and then check for spark. Sidestand/centerstand should be up, Got a good battery?

I am unfamiliar with your Keeway and just trying to help. Don't give me a bad rating if I miss the mark on this one. Thanks.

Posted on Apr 01, 2009

  • 4 Answers

SOURCE: suzuki 1200 bandit 1997 running rough at low revs

i had a similar problem on a suzuki gs250t custom, my bike would not start some times and if did start, would run erratically, and cut out, this was after i changed the spark plugs, found out that the supplier gave me the incorrect graded plugs.

Posted on Jun 11, 2009

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SOURCE: Suzuki vs800 intruder dies after about a mile!

Sounds like water in the gas. ALWAYS have a fire extinguisher on hand when working on carburetors.
For each carb > Drain the carburetor. There should be a screw on the lower side or bottom of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb.
Put the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.

Please rate this solution. Thanks!

Posted on Jun 11, 2009

  • 6 Answers

SOURCE: 954 fireblade splutters at 7000 rpm

1ST of all i think you should take your bike to another dealer to get it fixed as they should be able / confident mechanics to repair any problem.
But anyway have you checked the throttle position sensor ? of the fuel injector connections ?
just that water could of coroded the connectors.

Posted on Jun 21, 2009

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How to derestrict a 2007 Hyosung Comet GT650R


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1. If your pump does not turn on check the pump fuse and relay and all wiring including connectors for corroded, broken, or loose pins/sockets.
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1 Answer

2005 Hyosung GV 650 Aquila dies suddenly


Hi, Demetrim and the usual suspects are:
1. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, stator, magneto, ignition/electronic module.
7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Faulty neutral, side stand or clutch lever safety switch.
10. Air/fuel mixture screw improperly adjusted.
11. Accelerator pump damaged or not working.
12. Water or dirt in the fuel system, carburetor or filter.
13. Restricted, blocked or kinked fuel line.
14. Fuel tank empty.
15. The gas cap is not venting properly or fuel tank venting system blocked.
16. A failed fuel pump, pressure regulator and or fuel injectors.
17. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
18. Needle and seat stuck closed in the float bowl.
19. Lean angle switch is faulty or needs adjustment.
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1 Answer

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There is a switch that is connected mechanically to the rear brake mechanism. If the return spring has broken or the switch is broken or misalligned, that can call your problem as can the front break switch, if fitted.
Hope that helps.

Nov 05, 2010 | 2005 Hyosung GT 650 R

1 Answer

My 2006 gt650r backfires as l back down through the gears


Replace the exhaust gaskets in the head and pipe connections. This should minimize the the popping. Air leaks into the exhaust and re-ignites the unburned gases.

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1 Answer

Dose anyone know how to tune the carbs for a hyosung gt650R not restricted. i want to know the number of turns to set my air fuel. plz help.


Hi and welcome to FixYa,

Assuming everything is stock with no aftermarket add-ons, no carb issues, have you tried 1 1/4 turn from full in?

Good luck and thank you for asking FixYa.

Dec 07, 2009 | 2005 Hyosung GT 650 R

1 Answer

Power restrictor


Replace carb slides. Order the parts from hyo dealer. Remove carbs. Take out old slides and replace with new ones

Nov 10, 2008 | 2005 Hyosung GT 650 R

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