Should it be the return line that needs restricting or line to carb?

The return line.
Did you check the tank breather?

Did you see the downloads topic on top of this forum? You'll find different brake caliper adapters there.

G.

Do also check that the tank breather hose isn't clogged. There are topics on the forum describing fuelling issues which solved themselves once the gas cap was opened.

The fuel pumps always runs, as soon as the ignition is on. The jet in the return line is a 120 Dell Orto main jet, as shown in the 906 parts catalog.
Does the engine stall when it's still at higher rpm or at idle? If it's the latter I'd also check the ignition system and the voltage at the coils.

G.

Nice job!
Is the freshly painted tank the "NOS" 750 tanks? Asking because that is a 907IE tank, which is why the connections are different and there's a bracket for the electric fuel pump inside.
The seat lock is upside down.

G.

>>.do you think/know if they would fit the 750 Sport.? Hi, no, they don't- It's not about the diameter but the overall shape. Below some pictures. The first two show a SS header, which is similar to the one of the Sport. Towards the silencers it spreads outwards. The connection to the rear cylinder ...

Hi there, you could of course see if Rudy has one. Another option would be https://www.carmo.nl/index.php?main_page=page&id=2&chapter=0&language=de to check and repair yours. They also sell their updated version https://www.carmo.nl/index.php?main_page=product_info&cPath=4318_1224&am...

Have you tried to look for a Yamaha FZ750 headlight? You may find one of those in NZ.

G.

If you have the owner's manual check the picture on page 29 or the workshop manual p.9.
You'll find those on top of the 907IE forum in the FAQs.

G.

This is the gap with an original paper filter. If I remember well with a K&N it was a little bigger.

G.

Sometimes you can still find some from a Supersport. They work with a little mod.
https://forums.ducatipaso.org/viewtopic.php?t=4293

G.

I wonder if the shudder is from warped discs, a slightly lose headstock bearing or worn fork bushes. As these are hard to find, forks are often rebuilt using the old ones. I'd consider replacing the stock flywheel with a lighter one. Not only will throttle response be quicker but getting off the lin...

Here are my measurements which were very slightly different here and there.
https://app.box.com/s/l50rexciywaa26h209jq3i7kbplk018o
And here are the small ones:
https://app.box.com/s/u3egke9rsug5g7x55oe6odfy75fxkz98

G.

Here you go: https://app.box.com/s/rnb7w0dx1cq341kntlg7coifb78ns15k

G.

Hi Ethan,
after the site was hacked years ago, the gallery was not rebuilt. There's still a gallery page but it's just a collection of pictures. Maybe you're lucky: https://gallery.ducatipaso.org/

G.