Clutch spring BGM PRO XXL Vespa Cosa2 125, Cosa2 150, Cosa2 200, PX 125 (1995-), PX 150 (1

The Cosa clutch springs are available in different spring rates in order to adapt the clutch to the respective purpose of use.
As a rule of thumb for spring hardness: As hard as necessary, as soft as possible. General statements about the relationship between engine power/torque and spring hardness can only be made with approximate precision. Especially since the number of springs used also plays an extremely important role. The spring force is simply added.

Here is an overview of the spring rates of the Cosa clutch springs commonly used on the market:

Piaggio: 4.0N/mm

WORB5 XL: 6.2N/mm

BGM PRO XL: 6.5N/mm

WORB5 XXL: 7.1N/mm

Malossi: 7,9N/mm

BGM PRO XXL: 8,0N/mm

WORB5 XXXL: 8,9N/mm

Experience has shown that even with an engine power above 25HP, 10pcs. BGM PRO XL springs in our BGM Superstrong clutch are completely sufficient and still allow easy clutch operation (a well-oiled Teflon cable helps additionally!).

TIP: You can also use combined spring sets, e.g. 5x Piaggio + 5x BGM PRO XL. This results in a virtual single spring rate of 5.3N/mm.

Delivery quantity: 1k.

As lubricant we recommend BGM Pro Street gear oil (BGM2025, corresponds to specification API GL-3).

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