Tuning; Clutch - Yamaha RS90GTZ Service Manual

CLUTCH

TUNING

CLUTCH
The clutch may require tuning depending upon
where the snowmobile will be operated and the
desired handling characteristics. The clutch
can be tuned by changing the engagement
and shifting speeds.
Clutch engagement speed is defined as the
engine speed at which the snowmobile first
begins to move from a complete stop.
Shifting speed is defined as the engine speed
reached when the snowmobile has travelled
800 m (2,500 ft) after being started at full-throt-
tle from a dead stop.
Normally, when a snowmobile reaches shifting
speed, the snowmobile speed increases but
the engine speed remains nearly constant.
Under unfavorable conditions (wet snow, icy
snow, hills, or rough terrain), however, engine
speed may decrease after the shifting speed
has been reached.
Engine speed
Good condition
Shifting speed
Clutch engagement speed
Starting position
Distance travelled
2-63
INSP
ADJ