Marcel please help
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I have had a problem with my hyosung gt12r. It seems to cut out after passing about 65 mph it completely boggs down and dies. I have changed the fuel filter upgraded the fuel lines. I have had the carb apart ( all seems ok) the only thing I can’t get perfect is the mixtures. I have it set so I can ride the bike but Im still having problems. I am about to change the oil and oil filter as the bike has now done 5k miles (so still a new bike) but I dont have high hope this will fix anything. If you have any ideas please let me know
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Are you able to get access / ride to a garageĀ (even a car one)Ā Ā and tell them this….
1. Allow motorcycle to be least 20 minutes hot , from ice cold.
2. Remove both spark plugsĀ Ā (just lift the tank for the rear nicely
3.Ā Put a compression tester in the front cylinder plug hole.
4.Ā Leave rear cylinder aloneĀ (make sure it has no spark plug in itĀ (as per Korea’s instructions)=-=====
Press Start.
Hold bike on full throttle for 5 seconds.
See what the compression gauge says.Then repeat the rear engine cylinder.
Come back to this forum and let us know the psi of each cylinder as it is crucial we get the engine out the way first.
===== If plugs are out, run to halfords and fit only the normal “CR8E”Ā and see if the bike behaves better ?
Don’t buy IX and don’t listen to the mechanics suggesting it.Ā Hyosung GT125’s don’t like “IX” plugsĀ (Blue Box) .Ā Ā So i’d suggest only CR8EĀ (stock yellow box)Ā orĀ “LASER” typeĀ Ā (ones you see at this shop)
Also read this topic below, it has a lot of insight for you.Ā Ā Ā DEFINITELY MAKE SURE THE FLOAT HEIGHT is 7mm
Unsure?Ā Just replace the floats with new ones and get carb rebuild kitsĀ (that contain new float seats and new needles)Ā Ā = That will make sure the float assembly is working properlyĀ (bad floats close early , bike starts to drop back speed rapidly and cuts off, because the jets don’t reach all the way to the bottom and carb is upside down too!)Ā Ā (Sometimes O-Rings on the “gold float seats” can brittle away, and actually leak droplets of fuel through even after the floats have shut off the valves so to speak,Ā this called an internal leak,Ā too much fuel incarbs will bog it down too)
Mixtures = 2.5 turns outĀ (full circle) each pot and leave it alone foreverĀ (yes forever) , if the bike has other issues,Ā still leave the mixtures alone forever š ….way less stressful this way.
Let us know your progress,Ā excuse any grammatical errors in my replies, if i haven’t made sense,Ā just quote me to explain again in different way š
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Sounds like it is time to copy all i said in my replies and it will start to behave more as we fix 1 thing at a time in fairness, we do need to know how the engine is 1st before addressing any other parts.
To save repeats , check my previous reply and let us know how you get on this week.
I hope you got home safe š
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