Hyosung motorcycle 650 I think...fule lines to and from

SOURCE: i have oil in the coolant lines

Change and refill oil and change oil filter, refill coolant to it's level with proper mixture. Run bike on idle for 10-15 minutes, do a burst of revs and run constant rev at 5000 rpm for 20-30 secs, watch exhaust pipe smoke condition and if temperature gauge indicates overheating. Let bike cool off and check oil and coolant state. If you see milky oil, oily coolant and reservoir going empty, you may have a cracked cyl head walls. Happy hunting.

Testimonial: "thanks for the input was also thinking that the water pump might have gone bad causing it to **** oil into the radiator. what do u think?"

SOURCE: Son has a 2006 Hyosung 650. As the engine warms

Check your ignition at the moment it dies. Pull out spark plug. Is it wet? Dry as a bone? Attach it to the lead and be sure the metal part on the plug is grounded ( I use an old spark plug, any one will do-attached to a battery charger clamp to clip to the motor for good ground). Spin the starter and See if you have a good steady spark.
I'm gonna bet it's an ignition problem. Ignition components are heat sensitive and often fail the hotter they get, especially coils and triggers.
The oil sensor leads can be jumped to see if it temporarily solves the problem.