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I keep looking at these charts for YPVS programming clues.
The HP/Torque for an RZ350 with varying power valve settings makes it look like you should be at 100% open at 7400 rpm, (but with unknown pipes). Also, maybe, 100% closed until 6500 rpm regardless of pipes.

The Toomey pipe comparo is interesting, especially when you see what stock Canadian RZ pipes did for torque and power.

My RZ with Toomeys has this wild torque push at maybe around 7k that comes across as a pleasant surge forward with possible clutch slipping. Doesn't feel like the clutch is slipping, but sounds like the rpms are not climbing with the increased speed.

Wondering about changing the Zeel settings.

Looks great. Hold on to it. I missed your previous photo that didn't show on my phone.
My kid had a similar Chev that wasn't that shiny. Rear fenders seemed to be fiberglass. Drove us nuts quitting on the side of the road till we figured out it was needing a new iggy switch.
Guy came to buy it and gave him significantly more than what he was asking, which was very kind.

When you finish the center caps you will have a visual for those of us who want to see?

Hopefully not a '77 RD400. There's no Vitos for that.

I would count on exactly what happened in the photo above. A percentage of tariff plus $32.50.

Wait, I missed something; the TZR petcock wasn't keeping the bowls full but you extended the knob anyway?

I understand. That was one of problems with the original 26mm carbs. They would starve themselves. I'm guessing the needle+seats were doing it because that TZR petcock was tested for flow into a bucket and it ended up doing very well.

Sorry, you got tangled up in my nightmare. The RZ is now an enjoyable ride, just in time as the heavy humid heat is lifting.

have to extend the knob shaft out.

I did this. Not pretty but kinda happy with it. Riveted on a cutoff-wheeled and filed extruded aluminum piece dipped in plasti dip.

Very easy to turn left-handed now.

The Novita Flasher LL552 plugs in and works much better.

I also "rebuilt" the original with a new capacitor and resistor.

It will be a spare or I'll put it back in to see if the self canceling will work again.

Had to order (100) 150 ohm resistors 

Got 99 left if anyone needs a replacement.

I'm old with a clean record, so it should be reasonable. 

Sadly in Charlotte NC, this is not true.

Very nice bike. Don't sell it.

My wife has a different name for me.

And thus we have 2strokeworld so we can interact with those who understand.

When riding the RZ350, I notice that the LED headlight pretty much blinks when the signals are flashing.
Thinking it through and checking some things, I decided to pull the flasher relay box apart. It looks original.
There's no way it is not suspect when I see a sizeable capacitor in there - from 1985. It's pulling the voltage down for the headlight on a separate fuse.

With the signal canceller that hasn't worked except one night when I was riding home from Rock Hill, I think I'll give up making it work and go with another option.

The RZ unit has 3 prongs in the shape of what looks like an H4 headlight plug.

Is there a quick drop in? Maybe even a known digital flasher that doesn't care if the bulbs are LED or incandescent that fits the plug?

$1,086 or so to actually buy right now.

On the K2tec pipe description (https://www.moto-works.jp/k2tec/rd400.html) this caught my eye:
  Carburetor jetting is not needed for street use.
  For use in racetrack, where prolonged high rev situation is necessary, increasing main jet setting is recommended.
Seems a little odd that a "performance pipe" would not require a jetting change.

I remember my RD friends telling me to jet up for the Kawi H1 triple expansion chambers and that just made it run rich. I probably should have jetted back down and might have gotten a little more of a top end hit, but never did.
RD's are very sensitive with intake changes always requiring some jetting adjustment - more so, it seems, than exhaust changes. Weight loss over stock is worth it.

Clean and pure as the wind-driven snow 
... and it's yours.

Don't ride it or it will get dirty.

Besides, it looks like something that you do need so you can run out and get groceries.