Yamaha XC200T Service Manual page 128

[CAR CARBURETOR
2, Plunger assembly
The plunger assembly is composed of the
starter plungerand coldstarter plunger.The
starter p lungerprovides air-,fuel an mixturefor
starting and idling, t he cold starter plunger
providesa cold engine with a richfuelmix.°
ture for smooth acceleration,
_ _ _ _ _ _ _ ............ 3. Choke relay
.......... The choke relay provides electric current from
.......... the battery to the heater, When the engine
rpm reaches 600 r/mkl, the choke relay is ac,-
tivated.
Operation
]_ 1, With a cold engine
_}._. _ When the starter plunger is fully open due to
unexpanded wax in the choke unit, a rich mix-
_[_ ture is provided for starting the engine.
[17 Choke unit
_-'_\\ _ Cam
_=_Starter plunger
{_b Starter outlet
2. With a slightly warm engine
_ The wax contracts slowly since it is covered
_\ _ with a heat insulating material, thus a leaner
mixture than that produced for a cold engine
is provided,
_s _I_Choke unit
z22 _ll f .... ""X _'} Cam
_1 _} Starter plunger
L_ \ (,4_Starter outlet
3. With a warm engine
The plunger is fully dosed since the wax has
expanded The engine starts with only the
mixture produced by the main bore.
_} Choke unit
_2} Cam
Starter plunger
_4} Starter outlet
4_5