Yamaha MX 1972 - Page 32

Carburetor
adjustments
NOTE:
See
''MX"
Section
for
additional
data
for
DT2-MX
and
RT2-MX.
Each carburetor
is
set
by
the factory after careful tests.
Except for the following,
do
not change the carburetor setting without consulting
your local
Yamaha
dealer.
1 . Idle mixture
To
set the idle mixture
you
must turn the idle mixture screw ( # 1 ) in
until
it
lightly seats,
then
back
it
out 1 ¾
turns-no
more or
no
less.
This
is
a factory setting that
can
be
set with the engine stopped,
and
no
further adjustment is required.
2. Idle
speed
Start the
engine
and
let
it
warm
up.
Next, screw the idle speed screw
(#
4)
in
or
out, whichever direction is necessary for the engine to idle
between 1
,300
and
1,400
rpm
(check tachometer).
3. Throttle cable slack
After
engine
idle
speed
has
been
set,
then
loosen the cable adjustor lock
nut ( #
3)
and
turn
the
adjustor ( #
2)
on
top
of
the carburetor until
there is 1
mm
(.04")
of slack
in
throttle
cable
'B'. Retighten the lock nut.
Make the
second
throttle
cable
slack adjustment right at the throttle grip.
There is a lock
nut
and
adjustor
where
cable
'A'
meets cable guide 'A'.
Loosen
the
lock
nut
and
turn
the
adjustor until there is .5-1
.0
mm
(.02-.04")
slack
in
throttle
cable
'A'. Retighten the lock nut.
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