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Hi all,
Boy oh boy, I am excited to be here.
I used to own a 2001, 400cc Eddie Lawson Replica. It had air cooling, but it was really all for show, it had a radiator too and just wasn't the real thing.
I recently bought a 1981 KZ750 LTD. I ride it daily to work and back, but it will need love and attention to keep going.

I will not be doing a full restoration just yet, but the following must be done soon:
- strip and clean Keihin CV34's. It runs ok currently, it has a lot of power between 4k and 6.5k rpm, and then it is less eager above 6.5k rpm. It is also giving me very poor fuel economy. I need to research this a bit.
- the header pipes are rotten where they enter the tail pipe, I am going to have new headers built up. Possibly stainless steel. I need to research this.
- the bike does not currently have the original brake light bracket on it. I need to source a new unit, which is impossible in South Africa, so I will be turning to e-bay on this one.
- A few other rubbers and cables will need love. And a few areas where chrome is looking weathered. But I intend to use this bike as a daily ride for a few months before I park it as a show piece and before I begin a bit-by-bit polish and restoration.

Is Keyster a good brand of aftermarket Keihin spare parts?

My experience in restoration is limited. So I am very eager to read a lot and learn.

I used to have a Suzuki RG125, the 400cc Lawson rep Kawasaki, a Honda 1100 Shadow and a Honda VFR800fi.
If I can choose any bike now, I'd take my current KZ750 LTD. The oldest of the bunch and the most enjoyable. Not the fastest, but certainly a huge grin after every ride. And the fact that it is 38 years old is just incredible! Older than I am!

I've always wanted an early 80's, Kawasaki, air cooled, 4 cylinder and the KZ750 LTD is perfect.

Regards from Cape Town, South Africa

Welcome aboard!
One of the first things you need to chase down is a genuine Kawasaki factory service manual for your specific year and model. KZR has a bunch of pdf copies of various ones under the Articles tab, but I don't think ere is one for the 1981 750H2 LTD.
A good set of JIS screwdrivers will also serve you well, all those cross-head screws are not Phillips.
Your higher rpm problems may be a combination of things including, valves that have little or no lash, ignition advancer that is stuck and dirty carburetors. Those things can also cause poor fuel mileage. On a used bike, it is a good idea to go through all the routine maintenance listed in the service manual. It is quite likely that most of it, especially valve adjustment, has been neglected.
There is a great deal of knowledge and experience around here, so don't be bashful about asking questions.
Oh yes, Keyster has a good reputation. If their products are readily available where you are, use them with confidence.

The 80-85 750-4 chain drive manual covers the KZ750-H2. pdf has Yellow-Gold cover w color wiring diagrams. There's also a poorly scanned black-&-white version floating around the internet, so be sure to get the good one.

Hello and welcome SideArm66
as martin_csr suggested the Service Manual in the KZR database covers both 750-H1/H2 bikes.

kzrider.com/modules/ServiceManuals/GPz750.pdf