gd4now wrote: Patton, I have posted some lists and a how to ID carbs for the (K)Z650s (vm22ss and vm24ss carbs) IDs. I am working on a list of the larger (28vmsc, vm26ss and vm28ss) carbs but it is not complete as of yet. At least it is not in a state that I want to post yet.
I will say that info I can find regarding the 78 Z1R carbs the ID that should be stamped on them below the choke handle (though it could be on the same flange on the other side of the carbs) is 1040 and would look something like this
104
0 (could be other numbers or letters after this)
and yes they are were vm28ss carbs. Keep in mind I am not at this point willing to say that is the one and only correct ID stamp, but it is what I have found to date. I also have found info that indicates the numbers you posted about the jets and internals to be the same other than what I have found indicates they had pilot screws and not air screws?
Thanks, gd4now, for the list and also for the posts in previous threads that include pictures of the many various Mikuni manual slide carb varieties, with notations regarding the physical differences in appearance, and how to identify them one from the other.
Am thinking the currently sought-after list would be a similar chart showing the particular tiny i.d. numbers stamped on each variety of larger Mikuni carbs. Have been unable to locate such list of i.d. numbers associated with the respective carbs, on KZrider or elsewhere. Thanks for the on-going efforts in this regard.
Using the term "air screw" or "pilot air screw" or "pilot adjustment air screw" or other variant containing the word "air" is to emphasize that the pilot mixture on carbs having a side-located pilot adjustment screw is leaned or enriched by adding or reducing the volume of air introduced via the screw position.
This is in contrast to where the term "mixture screw" or "pilot mixture screw" or "pilot adjustment mixture screw" or other variant containing the word "mixture" is used to emphasize that the pilot mixture on carbs having a bottom-located pilot adjustment screw is leaned or enriched by adding or reducing the volume of mixture introduced via the screw position.
The terminology is just an effort to avoid confusion between the two types of pilot adjustment screws, where the side-located screw is an air screw, and the bottom located screw is a mixture screw.
Good Fortune!