How to reset an ECU unit on CBR250r

Follow step below
remove ecu by removing righ side fairing.
unplug ecu and wait 5 minutes.
plug ecu back in and turn engine on for 5 minutes. rev engine to redline a few times
locate wire loom running to tail light
with a piece of wire jump the connection between the blue and green wires
with the wires still jumped turn on the ingnition. wait 5 seconds then remove the wire you used to jump the connection
your check engine light should nowbe on (solid)
turn ingnition off
locate and remove coolant sensor. located above engine under the seat
jump the blue/yellow and green/white wire
with the wires still jumped turn the ignition on for 10 seconds. the check engine light should now be flashing
with the ignition still on plug the coolant sensor back in
turn igniton off
turn ignition back on and start engine. check engine light should come on then go off as it normally does. rev engine to red line a few times.
turn engine off.the ecu is now reset.

P/s: for the best result,reset your ECU before you start a long journey on the highway.

here is the another step to reset your ecu

http://www.cbr250rmalaysia.com/showthread.php?tid=57