Reply To: GT125R wont start
Tom has been helpful in your diagnosis , so go with what he says because i deal with wayyyyyy worse hyosungs and i usually have them running within a week. I am in yorkshire, so you ain’t to far fella. But don’t race to bring the bike to me just yet since i have faith you will be able to work on it and your hands are free labour.
Hey, if you crack this thing, you will be half-way being your own self-hyosung wizard!
I wont lie I wish korea spent more time in the electronics sector , but i can’t entirely blame them as my own inlaw has a new 2021 Jap bike thats flashing EML light and has been happening since the rains of 2021. The weather’s elements can be unforgiving, thus any bike i own personally i am usually ocd by;
– re-wrapping the harness all over tight , tight , tight.
– using “Suzuki Harness Boots” to hide any plugs subject to water attacks
– using ACF50, in every terminal, just a tiny bit , even if one bike doesn’t see rain , but least i can aid in preventing some form of oxidization. (Oxygen + Steel is a constant war, in of itself. but don’t panic, we have ways around these things to keep our 2 wheels longer)
Remember if the loom is great (fixed or inspected by you) then this is the usual sequence to start the bike;
– Is Neutral ON?
– Is the kickstand switch bypassed (yes , but don’t forget to always PULL in clutch when starting, fake neutral starts are rare but can happen and bike falls to the ground!)
– Is Clutch Switch Sensor ok ? (Multi meter = ohms in zero will mean its dead if you squeeze the clutch handle lever on / off , it will mean the circuit is dead)
– is the CDI ok ?
– is the Stator Pickup coil connected? (critical) = no stator, no sparks.
– is the stator 3 yellow plug connected (not critical to “ignite” the bike)
– bike rolls freely (real neutral) (this is on you to make sure just in general)
– Solenoid OK? (it will make click sounds if its dying or needs replacing)
– Battery is 14BS? (OEM size for GT bikes of any CC)
– Battery is not old ? (Hint = just turning on the bike, the volt meter will quickly drop from 12.8v to 10v in matter of seconds) (Replace it.)
Garages have a special yuasa analyzer that can check your battery and their screens will either say “battery good” or “battery needs replacing”. They do this for free anyways.
– Kill Switch Red Button is “pressed down” ? (towards you)
– Start Button isn’t broken?
Press start ==> check plugs for sparks ….
very Dull yellow sparks = Replace battery (common, winter is usually the harshest time for them), or check coils (common) or plugs (faulty plugs) or fishy HT caps ? – ensure plugs are CR8E ,dont buy LASER PLUGS until it runs. Its cheaper to run through basic CR8E for now . Don’t bother with Blue Box Iridium IX as the Hyos don’t like them much but yes they will run with them.
Hope i have made sense!