the mikuni manifolds are the same part number for both cylinders. 750 is 14010071B (2000), 900 is 13710081A (earlier?).

the 900 has a downward angle from the head face flange, as it has to meet in the same place the 600 and 750 manifolds do as carb location is the same on all capacities. the 600 have a "6" stamped at the edge of the head face flange, the 750 a "7". 750 is much the same size internally as the 900, whereas the 600 (and 400) manifolds are smaller internally. it's quite obvious when you see them side by side.

the 600 and 750 manifolds are straight from the head face flange by comparison.

not sure when they started stamping the numbers, haven't checked a 1991 model 750 for instance.

not sure what would happen if you ran 900 manifolds. the vert would try to lower the carbs, the horiz try to move them back, so they should be uneven.

this is a 900: http://www.ebay.com/itm/DUCATI-oem-750- ... 78&vxp=mtr

this is a 750. you can see the 7 too: http://www.ebay.com/itm/1993-Ducati-750 ... 4d&vxp=mtr

found this too! http://www.ebay.com/itm/Horizontal-Cyli ... 7a&vxp=mtr

also, the carbs are subtly different too. i know with the same jetting the original m600 carbs were leaner than the us spec 900 carbs when i did that swap to my 750 motor. just internally drilled passages, that sort of thing. plus there was quite a bit of variation in std jetting, 750ss was all the same, but 750m varied needle jet size depending on year, going from y4 to y2 at least, usually running a 132.5 main. ss always had y6 and a 140 main. so you may find slight variation depending on carb source.

Brad, thanks for the info.
I always thought the 600 and 750 manifolds were identical as the diameter of the carb is. Also I never noticed any number stamped on my old Mikuni manifolds but the ones I recently got have the "7" on them.
750

600



G.

That's the cleanest set of Mikunis I've seen in a long time!

I`ve been playing with three Mikunis myself yesterday and today as it`s finally nice and sunny outside.

As a consequence and as experience proves itself again I have to say something to all that plan a Mikuni conversion and get used carbs from ebay or anywhere else. Before putting the carbs on the bike disassemble them and write down all jets and needles. Most sellers don`t even seem to know which bikes they are from.
I recently bought one from ebay that was said to come from a 750SS.
As I made myself an Excel sheet long time ago with the jetting overview of Monster/SS/Elefant I can usually determine quite fast which Duc/Cagiva the carb actually came from and if the jetting was right. In this case though the needles were 5C17 instead of 5C19, the main jets were 132,5 instead of 140 and the main air jet which should be a 70 was a 49 on one side and 73 on the other
The next thing is that right next to the membrane there should be a small o-ring (#9 Tav.19) (not on the Mikunis coming from a Yamaha TDM/TRX). These were in place but before the spring of the idle mixture screw there should be a tiny washer and an o-ring (the o-ring has an inner diameter of 3mm and the washer just protects it from the spring). The o-ring and the washer were missing probably in 7 out of 10 carbs I rebuilt. (they are #11 & 12 on Tav.18 of the Monster parts catalogue)
So always take a close look, you never know what the last owner(s) did.
They might have lost the parts while cleaning the carbs or forgotten them on the workbench when reassembling them. Who knows. Always check yourself !

G.

Oh, is there anyone with a spare float chamber cover ?

G.

I hate it when interesting threads like this just come to an abrupt stop and you never get to know what the final outcome was . . .