Description
- Updated EXP (expanding friction disk) assembly
- Base material updated to provide better strength in high temperature environments, critical for the heat clutch systems create
- Internal wall bases redesigned for strength and rigidity, which helps translate to a more connected lever feel for the rider
- On the outside of the EXP disk, friction pads now match proprietary friction design found on Rekluse TorqDrive clutch plates, this design helps match oil flow characteristics on the clutch pack beneath, promoting improved cooling capability and consistent operation
- EXP 4.0 wedges have been improved to now use rolling contact with built-in pins
- Rolling pins versus sliding creates less friction and resistance, providing smoother engagement and a more responsive feel, creating stronger power delivery overall
- More direct power delivery, improved durability, and rider-focused functionality
- Engagement curve designs updated to better match modern motorcycle engine characteristics
- More tuning options with varying wedge weights and EXP springs
Tony –
As an enthusiast rider I really appreciate the attention to detail RadiusX put into upgrading the clutch system on the KX450 with this 4.0 kit – the redesigned friction disk, improved internal wall design, and rolling contact pins made a noticeable difference in delivering smoother, more direct power and a more responsive feel compared to the stock clutch so it was worth the price to get the most out of my bike.
Spike –
The RadiusX clutch kit is a must-have upgrade for KX450 riders, providing smoother engagement, stronger power delivery, and better durability that noticeably improves the bike’s performance.
Tad –
The RadiusX clutch kit noticeably improves my KX450’s power delivery, feel, and durability for a smoother, more connected ride. I’d recommend this quality kit as an upgrade over stock though it’s not the most technical option.
Burt –
The new RadiusX clutch kit seems more about justifying an upgrade cost than actually improving my Beta motorcycle’s performance. As an expert rider, I’m sticking with the proven RadiusX 3.0 clutch rather than these incremental changes dressed up as substantive improvements. Casual riders might be tempted by the flashy 4.0 upgrades, but take the promises with a grain of salt.
Dale –
This clutch kit seems like another minor upgrade that doesn’t really improve anything in a meaningful way. I’m skeptical that it will provide any noticeable performance gains over a regular clutch.
Luis –
The RadiusX 4.0 Clutch Kit offers significant upgrades for engagement, feel, and tuning flexibility so this casual, sarcastic dirt bike rider can get more direct power and tighter lever feel for improved trail control and domination.
Walt –
After installing the RadiusX clutch kit on my KX450, I’m very impressed with the smooth and strong engagement, more responsive power delivery, and excellent durability even after multiple rides.