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Boy, that's rough.
I'm going to pass. Everyone knows the red ones are faster!

also remember.. the large axle nut is on the opposite side from 350 to 400. so it -may- have a 350 swing arm in it as well.

The swing arm, where ever it came from was lengthened 3" so I didnt want that. I found a nice one on Ebay.  . 

If you purchased a replacement swingarm did you get one for a 400 or a 350? As Mark pointed out, the axle slots are different between the two to accommodate the different wheel collar diameters. If you have a RD350 wheel, which it seems you do, you'll need an arm designed for the 350. (or you'll need to fab up some custom collars to make it work with a 400 arm).
RD350: wider L axle slot
RD400: wider R axle slot (and the arm is about 1" longer than the 350)

Post up some photos of what your working with.

Both my 2 1976 RD400s have a serial number 1A1-00****   

Sorry, you're correct. First digit after the dash is a 0 on '76 model 400s. It's a 1 on first year 250s & 350s.
I'll correct my previous post

Ducati is locking up riders for next season already. They previously announced that Bagnaia had signed a contract for 2025 & 2026. Well now they've signed Aldeguer to a 2-year deal starting next season.
https://www.roadracingworld.com/news/motogp-ducati-signs-aldeguer-for-2025-and-beyond/

[30]

All RD400s were disc brake rear, whether cast wheels or spoked. The 400 did come with spoked wheels in some markets, however the drum rear was never a factory option in any market on the 400. (I have never seen a stock RD400 with a drum in back regardless of country of origin.)

The brake shoe part description at Mike's XS is an error because it lists the shoes as fitting RD400C, RD400D and RD400E. It will not fit any of those models on a factory original bike.

@Joe6v6 if you're unsure of the year of your bike, if your frame and engine numbers begin with 1A1-30xxxx or 1A1-31xxxx it's '77 RD400D. (If 1A1-0xxxxx it's a '76 RD400C)

Mark, too fancy of a place to get donuts? Enjoy the trip

[EDIT:]

The stator issue is resolved! Extremely happy with the service, communication, and support I got from RM Stator. They're a great company and I highly recommend them! Their stators come with a 2-year warranty.
Support timeline:
   -Reported the issue to them on a Thursday, and Friday they provided an RMA # and I supplied additional details, test results, and photos as requested.
   -Saturday morning they confirmed the unit was defective and that they would be shipping a warranty replacement unit on the next business day.
   -Monday the part shipped from Coaticook, QC, Canada by FedEx.
   -Wednesday at noon the new part arrived at my house.
They provided daily status updates each morning by email, including Sat & Sun mornings. Pretty unheard of in business today.

I'll post a follow up in the 4-stroke section for this particular bike.

EDIT: see: https://www.2strokeworld.net/forum/index.php?topic=6394.0

Rear spoked wheel with drum is not stock for a RD400.
Sounds like your rear wheel is from a RD350. Here's a sprocket diagram from JT


Not sure what shoes you got for a RD400 as they all came with rear disc so only used pads, not shoes.

Nice!

Looks great Tim! Nice work

Welcome William very nice looking Daytona! Congrats on your retirement
The plastics (side covers and seat cowl) for the RD400F have really gone up in price the past few years but they're around. The condition and price will depend on luck and how long you can wait for the right one.

https://www.ebay.com/itm/176276522401
Repro part: https://www.ebay.com/itm/403543659416
Replacement decals: https://www.ebay.com/itm/300963955520

Yeah, that's the cheapest I've seen in the last few years by far.
Seller needs to learn how to use punctuation. Holy run-on-sentences Batman!

A few things in the ad caught my eye that would say approach with caution:
"need new front cradle cause front motor mounts broke u can buy them on eBay for $125"
"bike is complete but disassembled"
"100% street legal and have paperwork to get registered"
"Picture is not of actual bike but what it looks like restored"

Ken Brumm is the guy who used to sell the aluminum swingarms for Kawasaki triples, RD's etc.  I bought two swingarms from him over the years.

Yep, that is correct. Sold under the MBP name.
Surprisingly, he said that most of those swingarms sold overseas and there was very little domestic demand. I would have thought it was the opposite.

I am able to download and view the last 2 images, 2582 & 2580. However if I try to attach them to a new post then insert them the message, they will only display with the filename and as downloadable jpg. Same as they are now. Not sure what's up with them.

If I open them for editing with MS Paint and then resave as a jpeg they seem to work.