Yamaha VK540EF Service Manual page 120

CLUTCH/GEAR SELECTION
The clutch may require tuning depending upon
where the machine will be operated and the de-
sired handling characteristics. The clutch can
be tuned by changing the engagement and
shifting speeds.
Clutch engagement speed is defined as the en-
gine speed at which the machine first begins to
move from a complete stop.
Clutch shifting speed is defined as the engine
speed reached when the machine has travelled
200 X 300 m (650 X 1,000 ft) after being
started at full-throttle from a dead stop.
Normally, when a machine reaches shifting
speed, the vehicle speed increases but the en-
gine speed remains nearly constant. Under un-
favorable conditions (wet snow, icy snow, hills,
or rough terrain), however, engine speed may
decrease after the shifting speed has been
reached.
A Engine speed
B Good condition
C Bad condition
D Clutch shifting speed
E Clutch engagement speed
F Starting position
G 200 X 300 m (650 X 1,000 ft)
H Distance travelled
ESS00094
GEAR SELECTION
The reduction ratio of the driven gear to the
drive gear must be set according to the snow
conditions. If there are many rough surfaces or
unfavorable snow conditions, the drive/driven
gear ratio should be increased. If the surfaces
are fairly smooth or better snow conditions ex-
ist, decrease the ratio.
ESS00095
Gear ratio chart
The drive and driven gears and the chains
shown in the gear ratio chart are available as
options. The figures containing a decimal point
represent the drive/driven gear ratios, while the
bottom numbers designate the number of links
in the chain.
2-39
INSP
ADJ