Question about Hyosung GT 250 Motorcycles
You should check that your battery is properly charged, first of all. If it's even a little low, it can cause problems with starting.
If you check that and find it's OK, next you check the coils and ignition electronics. If the coils are shorted once they fully warm up, they could stop firing the plugs. Same for the rectifier and regulator, if equipped - once electronics get warm, funny things can start happening. They don't really have a "failure mode", so it's difficult to diagnose some things without properly testing them in person.
You can get a $2.50 spark tester tool from your local parts store, and run it inline with a spark plug to see if you're getting fire to the plugs. If you are, you may just need a carb cleaning. Even with only 100 miles, there's a good chance you got crud in the carb.
You can test if it's the carb by spraying a quick shot of Starting Fluid into the carb throat and cranking at full throttle. If it starts, even for a second, then the problem is in the carb.
Posted on Jul 27, 2010
How new is the fuel filter? Did gas sit in it for a long time without being used? If so, maybe the carb is gummed up.
Also, I would remove the spark plug, hook it back up too the coil wire, lay the probe end of the plug on the head or 1/8" away from a steal/metal surface, then turn it over and observe the spark. Make sure it is a good strong bright spark otherwise change the plug and if needed, use a voltmeter on the coil and see how much voltage your getting.
Posted on Jul 26, 2010
Check to make sure the valve clearences are not too tight. If they start out too tight they will get tighter when they are hot and this could cause your trouble. Also make sure the carburator boots are tight on the carb and the cylinder head, any air leak here will cause a lean mixture and hard/no start condition.
Posted on Jul 26, 2010
Got to see if the motorcycle has gas going to the engine. Next time it stalls, take the spark plug out, and put a teaspoon of gas in to the cylinder, then replace the spark plug and see if it starts.
If it does, then the carburetor floats are likely not set right or the carburetor is plugged up. I'm assuming this is a 4 cycle engine and not a 2 cycle engine.
But, even so, if it's 2 cycle then the carb is getting stuck not allowing gas to flow.
Also, check the fuel filter.
Good luck on this repair. Happy riding.
Posted on Jul 23, 2010
You have a bad contact in the electrical wiring: as the bike is running it heats up and the metal parts expand, breaking the circuit. When the bike cools down the contacts cool also so the metal parts contract making the contact. To test where the problem is all you have to do is to follow the circuit and test the voltage: at the generator, at the key switch, at the ignition module and is sparks are present at the sparkplugs.
The battery died because you either:
1 - forgot to turn off the key so when the iffy contact reactivated when the bike cooled it started again to consume from the battery .
2 - the iffy contact is at the generator and you have run the bike without the battery being recharged - to check for this just start the bike and check the voltage at the battery, a good generator will provide at least 14.4 volts.
Posted on Jul 21, 2010
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Posted on Jan 02, 2017
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