1997 Yamaha YFM600FWAK ATV Service Manual, Page 18Get this manual
Explanation of Operation
The centrifugal clutch is separated from the clutch housing, and no power is transmitted to the primary sheave] Accelerating The centrifugal clutch comes in contact with the clutch housing, and power is transmitted to the primary sheaveThe primary sheave (or secondary sheave) is in constant contact with the V-belt and transmits power[9 Running at Constant Speed The centrifugal clutch is in contact with the clutch housing so power is transmitted[Q] Decelerating When the throttle lever is returned, the Vbelt is always in contact with the sheave, so the inertia force of the wheels is transmitted to the engine, and the engine brake functionsAlso, when the engine is running at less than 1900 rmin with the clutch in (for example, when idling and going down hi"), the engine brake functions by way of the one-way clutch