Taking things apart that don't need be to taken apart, cleaning them, then putting them back together again. All vital stuff to avoid the job list the missus has for me.

whats the bets his christian name begins with an F

Many companies use their accountants as the registered address which is what shows on companies house. The trading address is the errr trading adress.

92022?

Page 149

https://kzrider.com/modules/ServiceManu ... l%20Z1.pdf

Pretty sure I have a US 650 one which I believe is the same.

Get a splined washer with fold over tabs that lock the nut from a later model.

Don't know about any of the things you ask but remember to measure the hub offset before taking the old ones out!

Cant recall mate. I bought 5m of several sizes as its cheap, as I seem never to have a length of syphon hose when I need it!
Fraction of the cost for overflow pipes.

Here you go Snowy, fill yer boots at a fraction of the cost.

https://www.advancedfluidsolutions.co.u ... r-90-c.asp

Z650D2 (SR) frame and engine. Engine and frame numbers 193 apart indicates original engine for frame.

If it was fuel or carb related it would start to run rough and get steadily worse untill it died. To stop abrupty as you say it has to be electrical. I think your on the right lines with something making a higher resistance as it warms until its too hot to have contnuity. The most likely suspects an...

Great bikes, I've got two! Yours looks to have started life as a z650ltd judging by the 16 inch rear wheel.
Post the frame and engine numbers and we can check for sure.