20 Most Recent 2002 Hyosung Comet 125 Questions & Answers

Very good thought process on the adjustments. The throttle screw sets the idle speed and the air screw sets the fuel mix at idle speed. The stock setting is 1.5 turns outward. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward.

From this point you adjust the idle speed then adjust the air screw for fastest idle speed at that throttle screw setting. If the idle speed becomes faster than desired after adjustment, just reset the throttle screw and then reset the air screw.

A “very helpful” rating for this answer? Thanks!

Its the rear brake master cylinder. I myself have had this problem and all my mates with hyosungs have had this problem.
There is a seal kit that honda makes that fits the master cylinder for re-sealing, other than that get a new one.

replace the spark plug

Check your clutch freeplay. you should have just a little bit of freeplay, 1/8 -1/4" on the lever so when you pull the lever the clutch fully disengages.
Jordan

In the USA > Triple clamp / triple tree / steering stem (occasionally) ...... Elsewhere > ?

what to do with fluids?If your brake fluid is in need of changing do so before long-term storage. Similarly hydraulic clutch fluid should be changed before you store your bike; both systems may suffer failure if moisture gets in. Also make sure your coolant is fresh, as deposits can form from old fluid. For service intervals, consult your owner's manual.,,,

Make sure your battery is fully charged and then look for a in-line fuse in a little white case next to the battery. Open up the little white case and make sure the fuse is not blown and has a good connection. You can do a visual check to see if the wire inside is burnt, wiggle it and make sure the connection is good. If your fuse is good then you will need to get a multimeter and check each wire for continuity. Also look for any burned out light bulbs, when one bulb fails it could knock out all of the lights on your scooter

this is a cdi modual its the brains of the motor it makes the sparkplug fire

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 ..

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 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.