Fzr 600 rev counter goes from zero to eight thow and back constantly ???

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: Compatible Motors for 1992 FZR 600

hi m8,, pretty much any fzr motor will fit,, the only thing thats different is the water pump pipe from the rad to the pump at the bottom of the motor,, so may have to re route it,,check that 1st b4 gettin the motor, appart from that all engine bolt holes will line up and the rest will fit,, cheers m8

SOURCE: my head lights n dash lights on my 90 yamaha fzr

Sounds like to have a voltage regulator problem ,Get you local yam dealer check it out .

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: 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.