Cylinder pressure to determine fuel octane

[2TFool]

So, I've required this bike that I'm told needs 110 octane fuel and I'd like to establish whether it actually does or not. If I were to measure cylinder pressure with a compression tester would that be enough information for an educated guess?
Reading about the subject, pressure is not the only factor in octane requirement and I imagine experience and careful jetting are key?
I haven't even found a table that shows compression versus octane.
Would a compression test be done with a cold engine or a warm engine?
Should a compression test be done before a rebuild, would assembly lube affect the compression test, I imagine it would.
Thanks

[automan]

Compression is an indicator of potential octane required, that's it.
How well that octane combusts is they key.
Squish/ign timing/pipes/transfers all play a big or moderate role adding up to more that just a compression test.

[JKV45]

You can get a basic idea of your compression ratio, if you have compression psi numbers, with this calculator -

https://best-calculators.com/everyday-life/compression-ratio-to-psi-calculator/

[m in sc]

squish needs to be measured as does head volume.  as stated above, its an indicator. imho, anything over 135-140 psi on an aircooled rd350 is pretty high and would def need different considerations. I have seen where porting was aggressive and cold cranking showed 110-120 but as the rpm rose the cylinder pressure got out of control. so to automans point, compression is just an part of it.

[2TFool]

Thanks for the replies. At some point in the near future I'm going to disassemble the engine to change the main seals, have a look at the clutch etc. I'll measure the height and width of the ports, measure the amount of squish etc. If I could post the information here then perhaps you guys could take a look at it?

[automan]

I would, love to here, many others also.