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People are putting too much thought into octane with these bikes. A standard CG250 engine from any of these machines found on this site would likely run on horse piss if it was flammable. These engines are fairly low compression with extremely modest ignition timing. Heck, my Hawk has run on 87 WITH the compression increased (pre CDI or ignition advance flywheel key). I was in a pinch and I didn't like it, but I never experienced any knock/ping of any kind. In fact, the equivalent US octane these engines are actually rated to run on would be 85 octane, something not really found here unless you start to get into the higher altitudes.
The only thing I do recommend is to try your best to avoid the E10 fuels. You can't avoid ethanol in modern fuel though. Even "No Ethanol" gasoline can have up to 9% ethanol in it and they don't have to tell you about it (more common than you think). One thing I always recommend with these bikes is to add either a couple ounces of MMO to a full tank, or the same with marine grade fuel stabilizer. Doing this has the benefits of lubricating the moving parts of the carburetor as well as putting a film of oil inside the steel of the tank to help stop corrosion from forming. Some would also claim it can reduce wear on the intake valve face, but if it does it would be minimal. Plus, MMO mixed gas just smells so good when burned lol.
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