I bought octane booster for my 125 09 gas gas

Is it defo ok

Any issues long and short term

Might want to hook a turbo charger up to it.

Used it on 125 to give it a "boost" with no issues. Others went and got AVGAS. On Tesco Momentum and Shell V-Power it will improve the octane to the maximum of 102 allowed. It's not a massive increase in power but it's more "urgent".

Unless you have a specific problem with pinking and such there in no need for it, as they are designed for 98 RON or so and the V-power and such should provide that.

Octane in itself does not represent POWER, yet rather a resistance to ignite!(prematurely)

Some brief testing was indeed done on a stock 125 Sherco that indicated more power on proper pump fuel than the race gas. So go figure?

What copemech said above, does not make more power, but provides some resistance to pinking.

If you are looking to reduce pinking, start by tuning the carb first.

i had herd it ran cleaner so i bought it but then thought is it correct

Octane booster will not give you more power on a stock engine, I wont go into boring detail about octane etc.

It is good to use if you have already tuned engine as you can raise compression, advance timing and run slightly leaner to get more revs and the octane booster will reduce ignition knocking and detonation that can lead to meltdown and overheating.

So in a way it can give you more power as you can tune an engine higher if you are running on it.

A mate mixed some avgas some years back n must admit it ran like a factory bike, just sounded sweet as we both have same bikes