Pair of CGN motor springs original type for MBK 51, MOTOBECANE AV10, AV7 ...

This pair of mainspring is mounted on AV7 and AV10 engine! When an engine is properly prepared or equipped, it is important to use the right power regime! Originally, the variator starts to close very early, from 5500/6000 revolutions (when the motor is still far from its power range, the variator starts to close! As if with an automobile you were to shift your gear very early down It is therefore important to put a harder spring, which will cause your variator to start closing around 3000 revolutions later! You will therefore use the maximum power speed, as if on a car you were shifting your gear than a times the rev counter in the red in order to have power.This little spring will therefore be excellent on an original configuration or original type.