I know Brian at centurion and he is a perfectionist who does top notch work (ex-aerospace).

Sorry to hear you have issues.
Not running right is a common and often hard to resolve issue and can be a combination of issues.
Please see this article I wrote, based on decades of working on theses bikes:
https://airevalleyclassics.co.uk/badrunning.html

To be certain find the carb ID which is stamped onto the top front of each flange (engine side).
I have a lookup table of carb IDs:
https://airevalleyclassics.co.uk/images/source/articles/carbtablem.jpg

Z1streetfighter71 wrote:The blue Z1, were those Zephyr 1100 spoke wheels? Love to know what swingarm that is.

Custom built with Buzzard designed and Fastec produced billet hubs. Swingarm is ZX636 I believe

I would suppose they would fit, but not sure about looking right.
Might be better to have the mk2 scheme hand painted on to match the ST tank size?

I was down there for the annual ZRX met up and saw these nice Zeds.
Had a good chat with Dave of Buzzworks, one of his builds in attendance.

More info: it starts just fine, doesn't appear to be using oil as far as I can tell, revs OK but is super smoky. The smoke is whitish grey, maybe with a hint of blue. That colour sounds like oil being burnt. most rebuild parts for sale are cheap Chinese crap, made with poor materials and tolerances...

It can be one or many issues, please take a look at this article I wrote which outlines all the things you should check that can contribute to incorrect running:
https://airevalleyclassics.co.uk/badrunning.html

Hi, Just brought Z1000A1 & found the brake fault light warning on the display not working. Have done the usual checks & tests & found that the fault light switch relay ( the one under the tank connected to the loom with a 3 pin plug) has failed. Does anyone have one for sale or know whe...

deka wrote:Hi Nigel
I dropped you a PM last week but it has not gone and is still sitting in the outbox just send me me you address and will post as soon as i csan

Sorry been busy and not logged in for a few days.
I'll PM you now.
Thanks

Hi
I'll take them please is still available.
I will ping you a PM.
Thanks

Lovely!
Enjoy!

As has been said, sticking float or valve. You'll need to get the bowl off (carbs out to check). Could be debris.

Bill P wrote:Anybody got a Z1 there thinking of selling i'm not set on any particular model up to 75 i don't think
cheers bill

This looks a decent buy for £8500. Frame badly cracking in the usual places and no airbox.
https://www.ebay.co.uk/itm/256952781726

Jerry wrote:Anyone have any contacts to spray a frame in two- pack paint? Preferably West Midlands area.

I'm wanting the same too, but Yorkshire/Lancs way