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Yamaha MX 1972 - Page 20

Yamaha MX 1972
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grip
in
the closed direction. After the rear brake starts to take
hold,
gradually apply the front brake.
As the machine continues to slow,
shift
down through
the
gears,
using
engine compression to aid the slowing effect. When shifting
down,
watch
the tach to see that the engine does not over-rev.
Note:
During periods of Inclement weather, ice snow, rain, sleet,
or
ice,
or
on
poor road surfaces where tracton is minimal,
or
in
a
sharp
corner,
IT
IS NOT
ADVISABLE
TO
FIRMLY
APPLY
THE
FRONT
BRAKE. While
it
is true that the front brake supplies
the
greater
portion of braking power, it is also true that stability can
be
upset
very easily
if
it
is used incautiously under the above conditions.
5.
DT2/RT2
Break-in
Procedure
NOTE:
See
"MX"
Section
for
DT2-MX
and
RT2-MX
THERE
IS
NEVER A MORE
IMPORTANT
PERIOD
IN
THE LIFE
OF
YOUR
DT2
OR
RT2
THAN
THE
PERIOD
BETWEEN
ZERO
AND SIX
HUNDRED
MILES. For this reason
we
ask that you carefully
read
the
following material.
Because the engine is brand
new,
you must not put an excessive
load
on
it
during the first several hours of running. You could look at
it
in
this
manner: During the first 6
00
miles the various parts in the
engine
wear
and
polish themselves to the correct operating clearances. During
this
period prolonged full throttle operation, or any condition which might result
in
excessive head
and
cylinder temperatures,
must
be avoided.
However,
momentary full throttle operation (
2-3
seconds maximum) does not
harm
the engine. Each full throttle acceleration sequence should
be
followed
with a substantial 'rest period' for the engine by cruising at lower
rpm's
so the engine can rid itself of the temporary build up of heat. The
method
for breaking
in
a
DT2
or
RT2
is
quite
simple.
1.
Zero to
200
miles:
Avoid operation above
4,500
rpm. Allow a cooling
off
period of five
to
ten
minutes after every hour
of
operation. Vary the
speed
of
th8
motorcycle from time to time. Do not operate
it
at
one,
set, throttle
position.
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18
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