my Honda sh 125i has developed a fault starts and runs fine u ntill I give it full throttle, on the last quarter of a inch of throttle it drops down to tick over ,back the throttle off a fraction and away it goes got to be some thing simple as its just happened tried new petrol and fuel injector cleaner no change
ive seen this on another EFI bike, it was the throttle position sensor, the throttle opened a little too far and it threw the sensor a fault, try taking a little slack in or out of the throttle cable and see if it helps
