Bradman, i remember back in 86' at the A4DE at Erica Vic Mitch Shearer had a blue Maico and the final MX was a slick grass track with clay undernearth, the Maico was extremely tractable compared to other bikes. so possibly 85 was red and 86 went blue.
The 4 day at Erica was 87
'Slick' is an understatement for the final MX
I didn't bother doing the practice lap as so many before me couldn't complete 1 lap in the allotted ten minutes in time to be back for the start