Honda NSA700A DN-1 2009 Service Manual page 51

TECHNICAL FEATURE
• When the clutch is disengaged:
When the engine speed is low (1,200 rpm), weight ro ll­
ers are positioned at the center of the starting clutch
outer. Engine power is not transmitted as the oil pres­
sure in the high and low pressure cavities is equal
(high pressure is not generated).
• Starting to engage the clutch:
When the engine speed is at 1,800 rpm, the weight
rollers start moving toward the outside of starting
clutch outer and ramp plate, pushing the clutch valve
to the right.
As the clutch valve gradually closes the oil passage,
oil in the high-pressure cavity starts to be pressurized.
The starting clutch transmits the engine power
according to the generated oil pressure (intermediate
pressure).
• When the clutch is fully engaged:
When the engine speed is high, the weight rollers are
completely moved to the outside of the starting clutch
outer by centrifugal force. The clutch valve is also
moved fully to the right.
The oil pump side w ill be pressurized when the circuit
is completely closed by the clutch valve. The engine
power is transmitted when high pressure is generated
in the high pressure circuit.
2-8
WEIGHT ROLLER
RAMP PLATE
HIGH PRESSURE CAVITY
(LOW PRESSURE)
LOW PRESSURE CAVITY
(LOW PRESSURE)
INTERMEDIATE
PRESSURE
LOW-
CLUTCH VALVE
PRESSURE
HIGH-
PRESSURE
LOW-
PRESSURE