Yamaha SRX700D, Service Manual

Page: 124 / 497

2-43
INSP
ADJ
SDN2840
CLUTCH/GEAR SELECTION
The clutch may require tuning depending upon
where the machine will be operated and the
desired handling characteristics. The clutch can
be tuned by changing the engagement and shift-
ing 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 ~ 300 m (650 ~ 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 engine speed
remains nearly constant. Under unfavorable con-
ditions (wet snow, icy snow, hills, or rough ter-
rain), however, engine speed may decrease after
the shifting speed has been reached.
Å
Engine speed
ı
Good condition
Ç
Bad condition
Î
Clutch shifting speed
‰
Clutch engagement speed
Ï
Starting position
Ì
200 ~ 300 m (650 ~ 1,000 ft)
Ó
Distance travelled
GEAR SELECTION
The reduction ratio of the driven gear to the drive
gear must be set according to the snow condi-
tions. 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 exist,
decrease the ratio.
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.