There are the following:

P750 - 44DCNF 107
P750 - 44DCNF 110 (US)
P906 - 44DCNF 113
750S - 44DCNF 116 (according to some Ducati books it's a 113 so maybe like on the Paso there were different versions depending on target country)
900SS - 44DCNF 118 (-"-)

The question came up recently (again) what the differences are. I personally doubt it's just the jetting. Instead I think the difference could be the number and size of the progression holes. To see the progression holes you'll have to turn the Weber upside down and open the throttle valve. The pictures below show a 44DCNF 110. It would be great if you have one of the other models and could post a picture for comparison. I will post this in three forums although I don't like double posts. When I get some replys all info will be joined into one topic and the other two will be deleted.

thanks,

G.

Hi Gerhard,

I will send a picture of my 44 dcnf 107 progression holes the first occasion I have it disassembled.
But I have also a 44 dcnf 112 (7M) version (= 750 USA version) I obtained it as a spare one for easy/quick exchange during tuning activities (later on in the process).

Just to let you know there seems to be also a "112" version.

If you want me to pass other info just let me know (e.g. jets etc.).

Regards,

Frank

Gerhard,

Here the progression holes pic from the 44 dcnf 112.
This one has 5 holes.

Ciao,

Frank

Hi Gerhard,

Best wishes, just looked at my 44 DCNF 107 and it has 4 progression holes .
As soon as it of the Paso I'll send you a picture.

Regards,

Frank

Interesting. Then they are probably smaller than the ones in the 110.

Yeh,, it's a small crack, previous owner will have over torqued the adjuster screws.
Not a big deal, just for synchronizing.

Sorry, slip of the tongue: idle mixture ....

Gerhard,

I will try to measure the holes in the near future (will use the rear of small calibrated drill bits).
By the eye the lowest one is always smaller than the rest.
But I will check it for the 107 & 112.

Frank

Whats the diff ?
Is it the actual number of holes , the combined area of the holes or the length of the series of holes ( like how far the throttle plate is open before the last hole is completely uncovered. Maybe you could convert a 3 hole or 4 hole into a 5 hole by "lengthening " the last hole ..............just thinkin

I agree that the progression phase will be narrower but why would it be richer?

Stronger signal will pull more fuel. Higher pressure in the float chamber pushes more fuel into the low pressure of the venturi if that makes more sense

Gerhard,

I had the same question, to be honest I would rather assume the other way around ... ( more holes = more surface = less resistance = more fuel mixture from the idle circuit).

Just saying: I want to believe the remark but I don't understand it (I'm not a Weber specialist just an interested bystander).

Frank