Reply To: No spark – GT250 Carby
The 2 black spade connectors going towards the oil cooler is for the horn system.
I know even the 650 has a wiring diagram that says “igniter” on it and it is usually a strange mystery object or plainly exposed , however korea makes the harness.
Otherwise if there isn’t some sort of mystery sensor for the coil at the front section only , then i will suspect the harness itself allow the CDI to deal with igniting the coils directly without some sort of diode assist / or igniters.
Since fitting new coils …. These would also cut sparks off (and i will also assume they have been checked already ?)
– > Clutch Handlebar switch (bypass it, because it’s a race bike, you won’t need it unless your local club says it must be present)
– > Kick Stand switch (bypass it)
– > PickUp Sensor from the Stator (but it works as its circuit isnt dead and is in good ohms spec)
– > CDI unit.
-> Regulator Unit (You can contact some local wreckers and ask for a Kawasaki Mule regulator and a genuine Yamaha r1 regulator. Please avoid knockoffs because it’s not fun to see regs in smoke – its so common usually electrical issues we tend to only blame the coils, reg and stators because Hyosung doesn’t make them , but they are outsourced parts to some other korean company to do it. I digress, sorry.
Here is another hint, if you have a Digital Dash connected to the harness, you will see the rpm counter bounce when its cranking – That confirms it magneto is spinning 600 rpm as the typical speed of the stator motor to crank a heavy 250 flywheel.
I know you said the harness is checked from end to end with a meter, every wire colour you can find matching, so that’s great. I “should” assume the harness is okay , i can’t see it being fried from the pics or toasted up.
Perharps a spare harness from the wreckers and swap over the diode sensors and try again also ?
Keep us posted please. This is interesting.