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 the spring hardness is: As hard as necessary, as soft as possible. General statements about a relation 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 a motor power above 25HP in our BGM Superstrong clutch 10stk. BGM PRO XL springs are completely sufficient and still allow an easy operation of the clutch (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 the BGM Pro Street gear oil (BGM2025, corresponds to specification API GL-3).
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