Glen wrote:
After having a brief look over the bike just to check if it was siezed, it seemed fine, so I fired it up and she rode home.
Any ideas on this symptom? And how to rectify.

Glen, if the rear wheel locked up then its highly likely to have seized, in some way. You can't just look over the bike at the roadside and determine everything is fine. If it has seized, it could have grabbed and then freed off again, then allowing the bike to be rode home. But you need to take the barrels off for a proper inspection, if the barrels & pistons are clean then look at the crank.

All that excess fuel could have found its way into the crankcase, and washed away the oil film from the main bearings, leading to compromised lubrication.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30