Forget about the Octan, have nothing to do whit the power.
Clean up the mess.
Clean the pipes inside out, clean and meassure cylinders and pistones .
Make choire eaverthing is inside specifications.
Use fresh tires.
Tune eaverything
Have fun
Gripp, weight and reactiontime is what makes the difference.
Susspension is an important factor:
Fore an Exm.
To much compression and your tires bounces on bumps and loses grip.
To much compression gives bad comfort equal to wear you out faster if you go Mx or enduro fore an example.
To fast rebound and your tires spinns beqause the spring cannot take advantage of the push from your bikes weight.
slow rebound= little preassure on the tires to the ground fore a longer time ( Dragrace )
fast rebound= more preassure on the tires to the ground but fore a shorter time. ( Motocross )
Boshboo