There shouldn't be any drag on that engine through the clutch if you're just coasting downhill...the outer clutch body should be free-wheeling because the internal shoes aren't being 'thrown' outwards to engage the outer hub. If it is engaging, or 'dragging', I take the clutch apart to clean, inspect and lubricate...especially the bushing. This also shows wear of the bushing, causing wobble, which can cause dragging.