There are several threads on this topic.
To the best of my knowledge the only difference is the throttle stop restricting the maximum volume of air the engine can ingest.
Its easily corrected. However, i don't live there and don't know that they DIDN'T do other things!
If possible
this could be settled by looking at the PN on the OEM ECU! If the ecu has the same part number as all the other FZ's out there, its a simple fix. Replace the throttle stop and let it breath.
Sample of US bike with NO restriction.
Position of Throttle Stop at idle:
At WOT - blades must rotate ~ 90° from idle position!!!
A restricted throttle stop would have that downleg below the two screws EXTENDED so as to PREVENT about 30% of the travel which open the throttle blades allowing air into the engine. Some bend it, some saw it, some replace it.
If you lift the fuel tank, the ECU is right there (Bulk of wires into one device). Read the PN from it and report back!
[MENTION=26521]elitazzy[/MENTION]