Hey guys, i need your info on this matter, i've searched for it on internet and haven't found the answer yet, so, Malossi got choices of Contra Spring with various stiffness level (K Rating), my question is, how stiff is factory stock contra spring from Piaggio in a Sprint 150 I-Get ? (rated with K Rating)

Just got into upgrading the engine (lighter rollers), please, need your insights here.

Thankss~