Bike is Gary Fisher Hoo Koo E Koo 1996
Which I have not ridden a great deal and 90% on roads.
This link shows the bike (not mine!)
https://www.retrobike.co.uk/threads/1996-gary-fisher-hoo-koo-e-koo.56143/
The chain is marked CN-IG31 and after using Muc-Off Dry lubrication (from Aldi)it is very...