My K2 has Barnett CB750 springs. Middle number -56-
Work fine, not hard for clutch fingers
My K6 with +100whp must use the stiffer Barnett with middle number -66-
They are for the smaller CB's.
Slip with the weaker Barnett springs despite glass beaded metal discs, later clutch from an F2. Tested twice.
These made my clutch fingers really tired. It helped to lubricate the clutch cable with teflon cable spray.
Next step was "dog leg" type of clutch lever, more comfortable.
Both my bikes got them for clutch and brake.
GP style here
https://vintagecb750.com/products/clutch-lever-gp-styleStock type of clutch lever under the dog leg type that is more comfortable, flatter closer grip.
The golden spring, the weaker for CB750. -56-
Black the stiffer with middle number -66-




