Hyosung Motorcycles - Recent Questions, Troubleshooting & Support

Question edited for clarity. Help and the Service Manual https://www.google.com/search?q=2002+hyosung+sense+gas+and+vacuum+line+diagram ..

Question edited for clarity, typos, add CAPS. Did the take the connectors away? Otherwise, use bullet crimp connectors and shrink wrap sleeve same colour to same colour. https://www.google.com/search?q=2011+hyosung+gv250+efi+wiring+diagram ..

https://www.google.com/search?q=2008+Hyosung+GV+250.+It+is+bogging+down+on+acceleration ..

Check the actual switch on the handle bar. These can sometimes fail and stick in the on or off position. This could also be a faulty solenoid between the battery and the starter motor. Try this. Find the Solenoid. It's usually a small, black, round barrel shaped block. It will have two small and two large cables attached to the top of it. Disconnect one of the Small wires and reconnect the battery. If it kicks over it is most likely the solenoid. Disconnect the battery. Refit the Small wire then reconnect the battery. If the engine kicks over it could be the actual starter button.

Question edited for clarity and toss in some CAPS. Charge the battery up whilst it is still in the bike. If the voltage is lower than 11 volts or so with the engine being drained by the starter, there is not enough power to operate the fuel injection. The battery needs to be 12.4 to 13.2 volts. https://www.google.com/search?q=2018+Hyosung+GT125R+crank+won%27t+start ..

Question edited for clarity. Question moved from Cars and Trucks category. It is called surging and is normally caused by air leaks on the inlet manifold. https://www.google.com/search?q=2014+hyosung+gv250+surging ..

Just about anything is possible but this would be difficult. I think the body/chassis is different. You also have a different transmission between the two bikes; 6 speed on the 650R and 5 speed on the 250R. The 650R is a liquid cooled engine while the 250R is air/oil cooled. They both use different carbs.,

That was not the drain plug you pulled. Here is where i learned alot about my bike great source for information. And dyi guides. Idk when this was posted but you want to go here before you get into alot more of a project. https://hyoriders.club/forums/topic/wrong-drain-plug-for-oil-change/

There could be several possible causes for your 2002 Hyosung GV250 bogging down when starting out. Here are a few things to check:

1. Fuel system: Ensure that the fuel system is functioning properly. Check for clogged fuel lines, dirty fuel filter, or inadequate fuel supply.
2. Carburetor: The carburetor may be dirty or clogged, causing a lean fuel mixture. Clean the carburetor or have it professionally cleaned if needed.
3. Air filter: A dirty or clogged air filter can restrict airflow to the engine, leading to poor performance. Check and clean or replace the air filter as necessary.
4. Spark plugs: Worn or fouled spark plugs can cause poor ignition, resulting in engine bogging. Check and replace the spark plugs if necessary.
5. Exhaust system: A partially blocked or restrictive exhaust system can cause poor performance. Check for any obstructions and clear them if necessary.
6. Electrical system: Ensure that the battery and charging system are functioning properly. Weak battery or faulty charging system can lead to inconsistent power delivery.

If these steps do not resolve the issue, it may be necessary to have a professional mechanic inspect the motorcycle to diagnose the exact cause of the problem.

No one has experienced your issue although there are some electrical issues in the link. Check the all the connectors around the cluster. Break the connections, spray with switch cleaner and remake the connections. https://www.google.com/search?q=2013+Hyosung+GT250R+cluster+not+working ..

I"SSUE WITH TANK? CAN BE SCUFF OR DENT? PROBLEMS WhIT A TAKE ARE BAD FUEL OR RUST INSIDE PROBLEMS MUST BE SOLVED , ISSUES we ignore. ( even sabotaged fuel, cap off and sugar put in)? NO HISTORY told for the bike. for 1 year back or more. find a real shop to fix it? i GUESS THE MOTOR CYCLE SAT A LONG TIME AND FUEL WENT BAD OR SOMe one put in bad fuel or wrong fuel in the tank? or Green carbon Sabotage.? this is like the classic motorcycle problem most sit way way too long. and end up with bad fuel, then bad filters and bad injectors.<< all are hard problems real not mere issues. do not post other persons problems ever ,only post your evidenced.all and did not. if spark is good the injectors are not working. clogged ,sticking or leaking tips, due to bad fuel used. injectors can only be pro cleaned. they have 10 micron filters inside so are reverse flow cleaned not just dusted off, in a perfunctory manor. why hold back the facts on the TANK. seem to me that is the real problem passed over and not told what.

Question edited for clarity. Question moved from MISC to correct category. It is cheap Chinese junk with no support. Try cleaning the Throttle Body and if it has a Mas Air Flow sensor, that as well. If the bike shop is stumped, you need to find a new bike shop :>) All this stuff is electronic and is diagnosed by a scan tool computer.

i know this may seem drastic but in my experience i have found that the Chinese electric connectors are normally at fault first thing i would do is chop the connection block out and either put your own bullet connectors in or solder the wires together either way it is the connector at fault and needs replacing

The fuel gauge is faulty and should have to be replaced.

It sounds like there may be an electrical issue with your motorcycle. Here are a few things you can try:

1. Check the battery connections - Make sure the battery cables are securely attached to the battery terminals and that the connections are clean and free from corrosion.
2. Test the battery - Use a multimeter to test the battery voltage. A fully charged battery should read around 12.6 volts. If the battery voltage is low, try charging the battery or replacing it.
3. Check the fuses - Check all the fuses in the fuse box, including the main fuse. If any of the fuses are blown, replace them.
4. Check the wiring - Inspect the wiring for any damage, loose connections, or corrosion. If you find any issues, repair or replace the affected wiring.

If none of these steps help, you may need to take your motorcycle to a professional mechanic or dealership for further diagnosis and repair.

The Service Manual is in the link, plus other help. https://www.google.com/search?q=check+timing+on+Hyosung ..

In the link https://www.google.com/search?q=Hyosung+Avatar+650+vacuum+line+route&rlz=1C1QJDB_enCA643CA644&sxsrf=ALiCzsYxqf3sa4WN5V9Gd7xaqOhcKYzKUg:1651609807513&tbm=isch&source=iu&ictx=1&vet=1&fir=jyb9d4aLW2euvM%252CHtxJAxN0V4sSIM%252C_%253BYi-TAHh99m1-PM%252CBSOjNbrTvKuhbM%252C_%253BIZeXTDFZADOGsM%252Cw7IrU40CDo9qbM%252C_%253BbbzlEsGap33vSM%252CNrmDDmXV0KgByM%252C_%253BLmNHGdFUReD8zM%252ChLHAM30ZItEaSM%252C_%253BEAQSoITkJ-egpM%252CIQ4DKNsIaAKQLM%252C_%253Btrfx6h7-xBmcuM%252CrN0S59AztzbYPM%252C_%253BwhR-Ws8XE0VhHM%252CBSOjNbrTvKuhbM%252C_%253B-w3XvJJraMLXGM%252Cj_S94CiaLmc16M%252C_%253Bsr1C_G3UnfQBYM%252CBo6pu7kmuFavRM%252C_&usg=AI4_-kSjSi-JzVWukCqJykvzpHjNAb-ODQ&sa=X&ved=2ahUKEwi2q4n_lcT3AhURVc0KHV97D1IQ9QF6BAgaEAE#imgrc=IZeXTDFZADOGsM ..

Hello, Is this engine a two-cycle? Did you put oil in the tank or premix it? If this is a two cycle engine and you did not put oil in the separate tank or premix it, you have found the problem.

It's probably stripped from having been overtightened. It will have to be removed forcibly.