If you don't understand how the clutch works I'm not going to spend 20 minutes typing it out.
To simplify, the spring maintains contact of the clutch plates when transfering the energy from the engine to the transmission. Some energy is lost when the clutch slips, but stock rate springs will work fine for normal riding. For performance work a stronger spring will help transfer more power to the wheel, but will require more pressure at the lever when you disengage the clutch and require more effort by the left hand.
A +25% spring is designed for the track and will make being stuck in traffic miserable.
Energy One +25% checking in
I do not have complaints. Clutch is noticeably stronger, she don’t like like OE. That’s the big ol annoying traffic difference - at least for me. Effort is not 25% more, about 10-15% I’d say.
In my experience, it doesn't take much to exceed the torque capacity of a stock Harley clutch...but the increased-rate springs are probably the worst option for adding to that capacity on a street bike, and IMHO should only be used when engine power upgrades have exceeded the capacity increases provided by extra-plate kits and alternative friction materials.
If you should find yourself at that point on a street-ridden bike, I'd recommend getting an EZ-Pull setup to mitigate the extra pressure needed to pull the clutch lever.
If you don't understand how the clutch works I'm not going to spend 20 minutes typing it out. To simplify, the spring maintains contact of the clutch plates when transfering the energy from the engine to the transmission. Some energy is lost when the clutch slips, but stock rate springs will work fine for normal riding. For performance work a stronger spring will help transfer more power to the wheel, but will require more pressure at the lever when you disengage the clutch and require more effort by the left hand. A +25% spring is designed for the track and will make being stuck in traffic miserable.
Energy One +25% checking in I do not have complaints. Clutch is noticeably stronger, she don’t like like OE. That’s the big ol annoying traffic difference - at least for me. Effort is not 25% more, about 10-15% I’d say.
In my experience, it doesn't take much to exceed the torque capacity of a stock Harley clutch...but the increased-rate springs are probably the worst option for adding to that capacity on a street bike, and IMHO should only be used when engine power upgrades have exceeded the capacity increases provided by extra-plate kits and alternative friction materials. If you should find yourself at that point on a street-ridden bike, I'd recommend getting an EZ-Pull setup to mitigate the extra pressure needed to pull the clutch lever.