So i have two engines on my storage to use on my mini "cub" bike the one is 110cc with 6,7 hp and the other one is 100cc but with 7,5 hp so which is the faster the one that has more cc but with less hp or the other which has lower cc but more hp ?
More HP does equal more speed potential.
Torque is a greater factor in acceleration in most cases.
Ultimately, the displacement (cc measurement) doesn’t determine speed at all.
If you have the same gearbox for both motors, the higher HP (100cc) motor will provide better potential speeds (assuming that the torque is also higher). However, your gearbox may become the limiting factor if the motor is strong enough to peg the las gear with usual load.