10-12-22, 07:42 PM
There were issues with throttle response with the early FZ6. Many replaced the Throttle Position Sensor (TPS) which was a suggested change by Yamaha at a service if it the bike had an erattic at idle and surge when riding. Ensure the Air Filter is clean/new and the Plugs and Caps are good before going further if still the same after that I would suggest changing the TPS and balance the Throttle bodies then set the idle and TPS to suit. If still the same then get the ECU reflashed.