The PM Contour primary belt has many features that make it superior to other drive belts.
The engine plate and clutch are designed to tolerate the power of larger engines.
The action of the clutch on the lever is easier thanks all the use of lower rate springs, while the inertia-activated lock prevents things from moving when the power is increased.
It completely replaces the primary stock and uses a narrow strap for light weights, for a better angle distance and does not interfere with access to advanced controls.