Works like a lock up clutch.
Up to about 40% reduce clutch lever effort than stock.
Not only lighter, but stronger clutch engagement than stock when it revs up.
10-minute installation. Install through the derby cover without removing the primary cover.
Better clutch disengagement and feel than stock, Easier to find neutral.
Fits behind stock derby cover on '98 and later Big Twin Models with 6 Studs Style Clutch and primary cover. No modification required. (except '13 and later A&S Clutch, 3 Studs Style Clutch and '15 and later Narrow Primary Cover)
VP95 IV, VP84 IV and VP68 IV
VP 95IV - High Performance 120HP+
VP 84IV - Street Performance 100HP+
VP 68IV - Easy Pull Clutch <90HP
The VP (Variable Pressure) clutches adjust the static pressure by changing the position where spring pushes. The VP are named after the diameter of that position: 68mm, 84mm, 95mm. The IV is short for involute. The arms that press down onto the pressure plate have an involute curve and so our clutch plate became the VP 95Centrifugal force makes more clamping force
Regular clutches have static pressure only with clutch springs. The Lock up clutch has two different types of pressure. One is a Static Pressure, and another is a Centrifugal Force by Lock-up as an additional pressure.
Patent#: US 7,516,825 & US 7,428,955
