FZRSupport: the FZROnline Archive

Hi there ,

I was kindly given this clear explanation of how to bench sync my carbs on my fzr600 by DonTZ125..


Bench-synching the carbs - you want to use the smallest possible drill bit; 1/2" shanks won't work! Some guys use piano wire or safety wire. I believe the #2 carb is the 'master' - slip the wire in there, and adjust the idle until it JUST slips out, like a feeler gauge. At this point you repeat the process with the #1 carb, using the sync screw between them. Move on to #3 and then #4.
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The thing is when i am turning my tickover adjuster in, the butterflies are only opening a smidge.. not even enough to get a largish sewing needle in.. the tickover adjuster wont go any further because the spring over the screw is fully compressed...

your supposed to be able to do this with a small drill bit arn't you..???

I could take off the tickover adjuster extension, remove the spring and then wind the adjuster screw by hand..

no-one mentioned doing that tho, so i thought i would check..,

cheers chaps,

You sure you are turning the MAIN (master) idle screw?? Or one of the slaves (carb to carb to carb to carb) screws.

The master idle screw should be able to open the throttle plates about .120"


Ohh, and the throttle cables cannot be hooked up..the 'push' cable will limit any travel once it's slack is taken up