My zzr 600, 1994 model idles a bit too high at 1500 approx how do i adjust this down and what is the correct idle for this machine ty tommyfour

check that the transfer case has not slipped into a neutral position ( between 2wd and 4wd high or low

The idle speed is controlled by the engine computer through the idle air control valve , there are no provisions for adjusting idle . If idle is to high or you just think it's high , you need to test ,don't guess . Watch this video that shows what happens when you adjust thing's that you should not . Ford IAC valve test how to adjust minimum idle speed How to do it correctly !

These are usually not adjustable. High idle could indicate a leaking gasket.

The idle speed is not supposed to be adjustable. It is controlled by the computer.
What you may have is a vac leak, or the throttle cable may not be adjusted correctly.
If the throttle plate is completely closed, and there are no vac leaks, the idle air control valve is supposed to control idle speed by regulating how much air enters the intake.

Please tell me if you did any thing latly to your air intake or if you cleaned recently

Most bikes are in the 1000rpm range unles they are 2 stroke (some small Aprillas etc.), dont always go by the tacho meter, you can usually hear if the bike is idling too high or too low and idle adjustment is usually fairly easy once you find the adjuster screw.

Hi

If its an old Homelite you should have 3 screw on the carburator.
First bigger screw for adjust idle on the butterfly.
The 2 other for the mixture. One screw is ''L'' for low rpm mixture an other screw is ''H'' for high rpm mixture.

First the idle screw. It should just open a little bit the carburator butterfly.
Second full close both ''L'' and ''H'' screws (turn clockwise).
After open both ''L'' and ''H'' screws 1/2 to 3/4 turn (conterclockwise)

Normally the saw should start. Tune the ''L'' screw to have the motor running at idle if idle is to fast at this point is not important. After motor is running by itself at idle tune the ''H'' screw.
Full throttle tune the ''H'' screw to be able to pass from low rpm to high rpm with no lag.
Than at full throttle open again a little bit the ''H'' screw to make the high rmp mixture more rich.
Becarful if ''H'' screw is not adjust correctly the mixture will be to poor and motor damage can occur.

It may be necessary to re-tune a very little bit the ''L'' screw and idle screw after the correct setting of the ''H'' screw.

If it still not working carburator kit may be needed,

On some newer model there is no adjusting screws in this case see if a carburator kit is available for your model.

Yes, every carburator hase idle screw. Turn it to left tu turn down the idle.

Try to look for an idle adjustment screw. if not. The idle position sensor may be bad.

there is a white plastic knob on the vsv /firewall twist that out or in to adjust with ac on car running ?