1978 Z1R -- came stock with 28mm carbs?

wireman wrote:

Patton wrote:

wireman wrote: Hey Patton,Wheres the list of carb I.D numbers?
I thought there used to be one on here someplace anyway

If it's here, it's well-hidden , perhaps deep under a non-descript barn in an undisclosed location southwest of Omaha. :lol:

Good Fortune!

That would take hours of climbing over stuff with a flashlight! :woohoo:

If ya see some eyes shining, it's probably gd4now in there poking around on a research mission. :lol:

Good Fortune!

gd4now wrote: Patton, I have posted some lists kzrider.com/forum/3-carburetor/530034-jet-size#530036 and a how to ID carbs for the (K)Z650s (vm22ss and vm24ss carbs)that you posted above.

I am working (have been for some time) 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)

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?

Okay, I've removed my 1978 Z1R carb jets (107.5 main jets found; 15 pilot jet found; etc.) and the carbs appear to be bone-stock.

And I found the ID that you guys are discussing here -- it is on the #4 carb's input side flange and is in 2 rows and it reads:

104
A

However, I did a web search on "mikuni 104" and found nothing. For anyone in the future reading this, I therefore wouldn't worry if your '78 Z1R stock carbs are stamped with something different -- there so far as I can tell is not a large enough significance with this stamping to reliably be able to ID the carbs, else I would think all the places I checked, including Sudco, would have mentioned it.

I'm thinking perhaps this "104 A" stamping might be a manufacturing lot code -- it may in fact specify a stock 28mm MIC carb but I haven't found any table that associates any series of numbers/letters with a specific Mikuni carb.

I'm hoping someone here will chime in and have a table that connects the "104 A" type of stamping with a specific size/type of Mikuni carb.

I'm satisfied though that I've got stock 28mm Z1R carbs here -- I used a caliper to measure correctly, at the intake side of the carb (thanks for the tip on where to measure Patton!) and they read 28mm, and I have all the correct stock jet sizes in the carbs too.

I always see eyes glowing in there,damn raccoons like hiding in there and Im not about to grab ahold and pull them out! :sick: :woohoo:
Next time Roys in town he can help me dust! :laugh:

Not to doubt you but are you sure there are no other IDs stamped on the flanges. I know that sometimes my old eyes need the help of a magnifying lens to see them.

Recently in another post there was a question by a member kzrider.com/forum/3-carburetor/569800-carbs-for-gpz-eleven about a set of vm28ss carbs - this set was stamped 112 over 6 - which from info I can find indicated a set of vm28ss carbs off of a 80 D3 (ZR1) sold in a non US market. If you were to look at the assembly part# for the carbs on the Kawasaki web site (the second part of the part#) it will show that the D1 came with 1040 and the D3 came with 1204 in the US and 1126 in the non-US market.

Maybe I have been wrong about the IDs. But this has proved to be true of the vm22 and vm24ss carbs as well as the many different larger carbs I have had access to or read posts about. I do know that some of the other IDs do not always have 2 rows - just a single row.

But as I said before my list is not complete or at a point that I am ready to post it.

gd4now wrote: ...was a question...about a set of vm28ss carbs...stamped 112 over 6 - which from info I can find indicated a set of vm28ss carbs off of a 80 D3 (ZR1) sold in a non US market. If you were to look at the assembly part# for the carbs on the Kawasaki web site (the second part of the part#) it will show that the D1 came with 1040 and the D3 came with 1204 in the US and 1126 in the non-US market.

Maybe I have been wrong about the IDs. But this has proved to be true of the vm22 and vm24ss carbs as well as the many different larger carbs I have had access to or read posts about. I do know that some of the other IDs do not always have 2 rows - just a single row....

Very interesting to see the second part of the part number stamped on the carbs.
Whether, for example, the four numbers "1204" all in the same row, or separated such as:
120
4

Good Fortune!

gd4now wrote: Not to doubt you but are you sure there are no other IDs stamped on the flanges. I know that sometimes my old eyes need the help of a magnifying lens to see them.

Recently in another post there was a question by a member kzrider.com/forum/3-carburetor/569800-carbs-for-gpz-eleven about a set of vm28ss carbs - this set was stamped 112 over 6 - which from info I can find indicated a set of vm28ss carbs off of a 80 D3 (ZR1) sold in a non US market. If you were to look at the assembly part# for the carbs on the Kawasaki web site (the second part of the part#) it will show that the D1 came with 1040 and the D3 came with 1204 in the US and 1126 in the non-US market.

Maybe I have been wrong about the IDs. But this has proved to be true of the vm22 and vm24ss carbs as well as the many different larger carbs I have had access to or read posts about. I do know that some of the other IDs do not always have 2 rows - just a single row.

But as I said before my list is not complete or at a point that I am ready to post it.

I have no doubt that Mikuni at least at some point had a table connecting "104 A" to this specific 28mm carb. I guess my concern was, someone later reading this thread and maybe having a '78 Z1R stock carbs but not having "104 A" stamped on the #4 intake flange, I didn't want them to be misled and think that "all 1978 U.S. market Z1R will have 28mm Mikunis with "104 A" stamped on the #4 carb's intake flange."

For all we know at this point, this "104 A" that I found on my stock '78 Z1R carbs is different on the hundreds/thousands of other U.S. market '78 Z1R bikes.

Just for posterity, until we can have a reliable connection between this stamping, people shouldn't necessarily freak out if their '78 28mm Z1R carbs have a different stamping. Maybe they're all the same, maybe not. I'm in California, and this was a California bike, and even in 1978 they were clamping down on emissions (the 2 stroke triples and the RD yammies got killed off right around then) -- maybe my "104 A" specifies a California carb, I don't know.

I may bump up the 107.5 mains to 112.5 or 115's because I cannot find a stock muffler system for my '78 Z1R and will need to run a 4-into-1.

Patton, most appear to be in a 2 row format of 3 digits over one digit and maybe more digits or letters. Some are only a single line. For example the vm24ss carbs on my (K)Z650 have a single line of 272 stamped on them, which is the second part of the carb assembly part number for the early 650 B1s. But I have info from other owners of B1s where there is an additional line under the 272 with a 0 and a letter in it.

gd4now wrote: Patton, most appear to be in a 2 row format of 3 digits over one digit and maybe more digits or letters. Some are only a single line. For example the vm24ss carbs on my (K)Z650 have a single line of 272 stamped on them, which is the second part of the carb assembly part number for the early 650 B1s. But I have info from other owners of B1s where there is an additional line under the 272 with a 0 and a letter in it.

10-4 on that, my 28mm Z1R carbs, as well, have 2 rows on the #4 carb's intake flange:

TOP ROW SAYS ==> "104"
2ND ROW SAYS ==> "A"

Now, I *did* find an engraving, very faintly stamped but it says "Y 4"
in a single row on the #1 carb's intake flange, just below the choke.


Maybe gd4now you're on to something -- the 104 corresponds to the '-1040' of the
Z1R's carb assembly part number, which is 16001-1040 (<== Kawasaki.com's part # for the entire 4-carb set)

Not sure what the 'A' and the "Y 4" stand for though.

newOld_kz1000 wrote: ..."104 A" stamped on the #4 intake flange...that I found on my stock '78 Z1R carbs ....

kawasaki.com shows KZ1000-D1 (Z1R) (1978) having CARBURETOR ASSY Part Number 16001-1040.

This might correlate with a stamping on the carbs such as 1040, or
104
0

kawasaki.com shows the same KZ1000-D1 carb assembly part number 16001-1040 for U.S., California, and Canada models.

Wouldn't be surprised to see other Kawasaki models besides KZ1000-D1 also having carb assembly part number 16001-1040.

Good Fortune!

Do please keep in mind that as I said, my list is not complete or ready to post. It does appear that the ID is listed correctly for many/some of the carbs listed on Kaw site, but not for all. Some of listings on the Kaw site have superseded an earlier part# and then the # listed is not correct. As an example the # listed on the Kaw site for the vm28sc carbs that came stock on the 73, 74 and 75 Z1s is listed as 217, yet it appears that the following are the IDs stamped on these carbs

1470 used in 72
1472 used in 73
1473 used in 74
2170 used in 75

Note that only the ones for the 75 model year have the 217 within the ID stamped on the carbs.

So do not put your total trust in the part# just yet.
Will say that from what I can find it appears that after 75 the numbers do line with with the part # better than they did before 76.

gd4now wrote: Do please keep in mind that as I said, my list is not complete or ready to post. It does appear that the ID is listed correctly for many/some of the carbs listed on Kaw site, but not for all. Some of listings on the Kaw site have superseded an earlier part# and then the # listed is not correct. As an example the # listed on the Kaw site for the vm28sc carbs that came stock on the 73, 74 and 75 Z1s is listed as 217, yet it appears that the following are the IDs stamped on these carbs

1470 used in 72
1472 used in 73
1473 used in 74
2170 used in 75

Note that only the ones for the 75 model year have the 217 within the ID stamped on the carbs.

So do not put your total trust in the part# just yet.
Will say that from what I can find it appears that after 75 the numbers do line with with the part # better than they did before 76.

Agreed, and also, because this site seems to be an international reference point for Z bikes, it's probably not conclusive until these stampings are correlated for the different countries, since the bike was different in Canada/UK/Europe etc.

It's "eyes wide open" for the international readers out there because we rarely see non-U.S. bikes' carbs here and hard to make this connection with flange codes and part numbers as a hard-and-fast rule.


It sure the heck would be cool though to nail this, it would make it easy to figure out what carbs you've got with a simple table look-up.

Here are the numbers listed on the Kaw site

vm28ss carbs
78 KZ1000D1 Z1R kaw site list 1040
80 KZ1000D3 Z1R kaw site list 1204 - US Canada list 1126
79 KZ1000E1 shaft kaw site list 1098 - US E1 and E2 Canada 1109 both E1 and E2
80 KZ1000E2 shaft kaw site list 1098 - US E1 and E2 Canada 1109 both E1 and E2
79 KZ1000A3 - kaw site list 1131 - shows US on A3 A3A and A4 - 1132 for canada for A3 A3A and A4
80 KZ1000A4 - kaw site list 1131 - shows US on A3 A3A and A4 - 1132 for canada for A3 A3A and A4
79 KZ1000C2 (police) kaw site list 1066 - shows C2 and C3 and C4
80 KZ1000C3 (police) kaw site list 1066 - shows C2 and C3 and C4
81 KZ1000C4 (police) kaw site list 1066 - shows C2 and C3 and C4

vm26ss carbs
76 KZ900A4 kaw site list 255
77 KZ900A5 kaw site list 255
76 KZ900B1 LTD kaw site list 255
77 KZ1000B1 LTD - kaw site list 1055
78 KZ1000B2 LTD - kaw site list 1017 - shows used on B1 and B2
79 kz1000B3 LTD - kaw site list 1089
80 KZ1000B4 LTD - kaw site list 1202 - shows used on B3 and B4
77 KZ1000A1 - kaw site list 1024 - shows used on A1 A2 and A2A
78 KZ1000A2
78 KZ1000A2A
78 KZ1000C1 (police) kaw site list 1025 - shows C1 and C1A

I have some other numbers from some other parts list but am still putting the list together