I noticed that these bikes on your side of the world seemed slightly upgraded compared to the US spec. It wouldn't surprise me as it tends to happen a lotReckon it's an 89 too, plenty of parts the same as my 89 Tufftrax. You could get grey frame, yellow forks, stem and bar in the UK too.
Wonder if they offered each model in the neon yellow that year as I have seen 89 Muirwoods and Pine Mountain's in that colour? Possibly team colours as the British factory team were on neon PM's that year?
Lovely bike btw, box fresh. My mate used to have a similar condition 89 Bear Valley that was equally as ace.