Any round (non-CV) or flat slide carbs for '91 - '03 CB750 Nigfhthawks?

[slmjim n Z1BEBE]

Specifically, that are direct bolt-on to the intakes & stock airbox? Jetting suggestions for same on a stock motor w/unmodified OEM exhaust.

Good Ridin'
slmjim & Z1BEBE

[Bob H]

Keihin makes expensive flat-slide carbs.
I have no experience with them, and the fact you are asking means you likely have more experience than the rest of us...

I bumped into info on their high-end carbs earlier this year when I was exploring the Keihin web site (changing their name to Hitachi Astemo which is a bad idea for any brand recognition).

Their application chart lists various 4 cylinder Honda but not the 750 you have - it would be worth a phone call.
https://www.keihin-na.com/aftermarket/fcr-flat-cr-racing-carburetor/

As for fitting the intake - airbox, it appears some of their carbs for 4 cylinder engines are mounted on a bracket with slots so you can adjust spacing between them (don't know about diameter connecting to the manifold though).

The first 2 minutes of this video is garbage, but after that it is interesting that these are not vacuum operated Constant Velocity carbs.