Rule of thumb is the higher performance an engine is, the higher the required octane petrol. I think the older, 250 performance bikes prefer 95/98.
Pinking occurs when too low an octane is used, and the engine is allowed to 'strain'. Either advance the timing or go to a higher octane.
As for oil, most 4 stroke motorcycle-specific oils should be ok. Mineral or semi-synthetic for a CBR250RR. 10-40 grade.
Do you realise how many holes there could be if people would just take the time to take the dirt out of them?
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