| Hi, indeed i cannot confirm or know for sure when this started... but anyway i can tell that i heard the bike one morning doing a strange louder than usual noise, i took it to service where they removed the airbox and cleaned the throttle linkage + checked the top expansion tank.
I took the bike the next day and i noticed a strange distinct metalic sound while revving it around 5000-6000 rpm. This happened only while riding, it was very clear cause it could only be heard only on acceleration,ever on constant throttle or decceleration.
The same evening i had a problem with the throttle linkage, cable, something sticking open, bike revving on it's own so i took it back to service the next day.
They started it the next morning and they noticed a very loud metallic noise at idle, stopped it immediately, started it again, same thing, stop again and the 3rd time it didn't do it anymore.
I arrive at the service the same day and of course nothing could be heard anymore.
Finally decided to start removing the side covers and then the heads/cylinders for further inspection.
the result was the following (sorry for the bad quality photos, did em with my mobile)
Valves are ok, piston rings are ok / cylinder is ok; no sign of the object in the engine/exhaust |