My yzf 600 wont move under 3000 rpm - 2005 Yamaha YZF 600 R thunder cat

SOURCE: yzf 750 wont rev past 4000 rpm

Sounds like you need some plugs and the carbs cleaned and synchronized.

SOURCE: Power Loss at around 3000 rpm

are the carbs balanced correctly and are you sure that all of the jets are clean. if not try it, it might work. sluggish throttle response is normally to do with the carbs.

SOURCE: Speed to RPM ratio?

The Yammy 600 run at high RPM. Also depends on rear tire size

SOURCE: does a yzf 600 thundercat have an engine

Did you just have you fuel tank off? There a wire connector that needs to be plugged in.

SOURCE: i have a 2003 yamaha yzf 600 the tach dosent read correct

I do not believe so, as the tach is related to your firing electrical pulse. have you checked the tach wiring for loose connections?