carb tune help/procedure

The ones inside here

OK. Those screws that have the locknuts on them that are under the carb caps are not air screws. They are in fact the individual throttle adjusting screws, and yes they are the screws you use to synchronize the carbs, They do not change the air/fuel mixture at all. What they do is raise or lower the slide inside the carb. By raising or lowering the slides one can adjust the amount of vacuum inside the carb when the engine is idling. When the vacuum in all 4 carbs is the same at idle, the carbs are synchronized.

For future reference, assuming that photo shows your carbs, they are not the air screw type; they are the pilot screw type.
Ed

650ed wrote: OK. Those screws that have the locknuts on them that are under the carb caps are not air screws. They are in fact the individual throttle adjusting screws, and yes they are the screws you use to synchronize the carbs, They do not change the air/fuel mixture at all. What they do is raise or lower the slide inside the carb. By raising or lowering the slides one.can adjust the amount of vacuum inside the carb when the engine is idling. When the vacuum in all 4 carbs is the same at idle, the carbs are synchronized.

For future reference, assuming that photo shows your carbs, they are not the air screw type; they are the pilot screw type.
Ed

Yeah those are the carbs on my bike

So then how do I go about adjusting the bottom screws on the bowls?

If you mean the pilot screws which each carb should have on the bottom near the engine side of the bowl, you should use the Kawasaki Service Manual for instructions. Those pilot screws control the fuel in the air/fuel mix and should not be fiddled with unless you have the specific instructions in the manual. Ed

They adjust the amount of fuel that goes into the engine at idle. They're more responsive than the air bleed screws. You can tell by the RPM's. Adjust them to max RPM's and move on. If you adjust anything else, you readjust them to fine tune the carbs. You need to sync the carbs, then fine tune using them.
Steve

Sorry Ed, I stepped on your post.
Steve

In the factory manual it says to first remove the pilot screw limiter then turn in the pilot screw gently in till it seats and then back it out 1 and 1/8th turn .....then push the limiter back on with the ridge ( tab) facing forward.

The Clymer says the same thing except does not say to remove the limiter first but does say after adj of 1 and a 1/8th turns replace the limiter with the tab facing foward.

Like Ed says they probably should be left alone unless someone has played with em or you or someone else removed them for carb cleaning.

Both my manuals are for the 1978 KZ650B.

blink - i have the 76 and 81 FSM - when synced the readings should be less than 2 cm hg between any carb - so actual readings are not important - and normal vacumn readings appear to be different for models.
19 -24 cmhg on the 76 and 14 cmhg min on the 81 but forget that and work on getting them as equal as possible.
Sync screw out decreases vacumn and in increases .
The air mixture screw settings are different for models also.
3/4 out for the 76 - thought it was 1 7/8 out for the 78 but could have read it wrong. Has your clymer got that setting ?
When you do find the exact setting for your model and if you have mucked with them i would take them out carefully and check em out - make sure all parts are there - reinstall - reseat them Gently just till you feel them stop - dont force them - go easy.
Then take notice where they seat - i use a marker pen when seated so it gives a good idea - back out slowly to your model spec and then sync.

KZB2 650 wrote: In the factory manual it says to first remove the pilot screw limiter then turn in the pilot screw gently in till it seats and then back it out 1 and 1/8th turn .....then push the limiter back on with the ridge ( tab) facing forward.

The Clymer says the same thing except does not say to remove the limiter first but does say after adj of 1 and a 1/8th turns replace the limiter with the tab facing foward.

Like Ed says they probably should be left alone unless someone has played with em or you or someone else removed them for carb cleaning.

Both my manuals are for the 1978 KZ650B.

What's a pilot screw limiter? Not familiar

That's a plastic POS they put on there to keep the owners from adjusting the leanness out. Some have a cap pressed in so you can't get to it. We do anyway. :evil:
Steve

swest wrote: That's a plastic POS they put on there to keep the owners from adjusting the leanness out. Some have a cap pressed in so you can't get to it. We do anyway. :evil:
Steve

Put on where?