04-07-2021, 05:03 PM
Just wanted to clarify something first - slipper clutches and rpm-assist clutches are 2 separate functions. The slipper function does not affect clutch lever pressure.
There are bikes with only slipper clutches, while the feature you want - rpm-assist, is on the 2017 EX model, which also has a slipper function. You could have a clutch with just rpm-assist, but it is so easy to add the slipper function (or vice versa).
These 2 innovations are so mechanically and cost effective, they will likely become standard equipment on most bikes.
With rpm-assist, like the CB650R also has, ramps in the clutch help force the clutch plates together, something that only springs could do before. On the 2017 EX, only 3 springs are used, instead of 6 (although the 3 are heavier ones). I believe lever pressure was about 17% lighter
A longer lever will give lighter lever pull, but needs extra travel to engage/disengage. Same thing with a smaller clutch master cylinder bore. There is no real way to cheat physics, except with the rpm-assist in the clutch itself.
Adapting the 2017 EX parts has been tried, but the results were not completed in this thread:
http://cb1100forum.com/forum/showthread.php?tid=12071
I believe it would have worked properly with just the right spacer installed, but I wasn't there.
There are bikes with only slipper clutches, while the feature you want - rpm-assist, is on the 2017 EX model, which also has a slipper function. You could have a clutch with just rpm-assist, but it is so easy to add the slipper function (or vice versa).
These 2 innovations are so mechanically and cost effective, they will likely become standard equipment on most bikes.
With rpm-assist, like the CB650R also has, ramps in the clutch help force the clutch plates together, something that only springs could do before. On the 2017 EX, only 3 springs are used, instead of 6 (although the 3 are heavier ones). I believe lever pressure was about 17% lighter
A longer lever will give lighter lever pull, but needs extra travel to engage/disengage. Same thing with a smaller clutch master cylinder bore. There is no real way to cheat physics, except with the rpm-assist in the clutch itself.
Adapting the 2017 EX parts has been tried, but the results were not completed in this thread:
http://cb1100forum.com/forum/showthread.php?tid=12071
I believe it would have worked properly with just the right spacer installed, but I wasn't there.