My 2003 fazer 1000 has a fault code o7 does any one know what this means the rev counter goes from 0 to 7000rpm only when i do motorway riding

SOURCE: i have a thunderace and the rev counter keeps

7000 rpm is a self diagnostic code that either your exup valve is not being detected or the valve is locked up and not moving. If you put a header on your bike and took over the exup valve servo motor, you are going to have to put it back on. It also changes the mapping of the ECU and will not let it rev to redline when the Exup servo motor is missing.

SOURCE: Speedo Problem

check the connections for the tach and spedo the mileometer is tied in wit the spedo and the tach should have some connection wit the coil

SOURCE: Rev Counter indicating fault code

been told its something to do with the fuel sender in the tank. i think a wire come adrift, hope this helps, Uni. From Unitracmotorcycles.

SOURCE: the rev counter goes from 0 to 7000 revs then back

that is the indication of the exup valve malfunctioning. it tosses the code of 7000 rpm for a few seconds on start up to let you have an indication that there is a problem.

SOURCE: Yamaha Fazer 600 2000g speedo

think your tps sensor not connected properly it will show 3000 revs for 3 seconds then your idle speed for 3 seconds ( being 1) then 0 for 3 seconds and will repeat until you turn ignition off. its on the right hand side by the carbs the plug is covered by a black plastic sleeve turn bike off then disconnect sensor clean contacts then re connect. hope that helps
Kev