My bike has a 200 cc engine: Loncin Vertical single cylinder, 4-stroke, OHV air-cooled - bore & stroke 63.00mm X 62.00mm - compression ratio :9.0:1

The makers/importers say to use a 'premium unleaded fuel'.

In Australia that is usually 95 octane, which costs 5 cents + more per litre. or we can get 'ultra' which is 98 octane. These are different to USA ratings.

Ordinary unleaded is 92 octane here and E10 (ten percent ethanol) is 94 octane.

What do these engines really need and why? They are quite simple jobs, no EFI or engine management that I know of to be thrown out of whack.

Will I get problems using the E10 in the bike (I use it in my 20 yr. old car with no problems despite it has EFI.)? Would regular at octane 92 aus. really be a problem?

Is this 'premium required' rating intended just to raise above other world standards of 88 to 90 octane for regular?