The EXP™ auto-clutch is an excellent choice for recreational riders looking for innovative anti-stall performance at a great value. What it Does: Using principles of centrifugal force, the EXP™ auto-clutch allows you to start and stop without ever touching the lever. The lever is still fully functional at any point in time for shifting or modulating the clutch manually. Shifting the transmission is still required. Yes it's true! One can now enjoy the benefits of Rekluse auto-clutch technology while racing or riding at the most affordable price. Faster cornering. Improved traction. Virtually eliminates stalling. Smooth engagement. Better starts. Faster lap times. Fully tunable to rider preference and terrain conditions. Easy installation utilizes existing O.E.M. clutch components without modification.