Yamaha DT125E 1977 Owner's Manual page 19

2. 1 6 0 - 4 0 0 km. ( 1 0 0 - 2 5 0 mi.):
Avoid prolonged operation above 5,000
rpm. Allow the motorcycle to rev freely
through the gears but do not use full
throttle at any time.
3. 4 0 0 - 8 0 0 km. ( 2 5 0 - 5 0 0 mi.):
Avoid prolonged full throttle operation.
Avoid cruising speeds in excess of 6,000
rpm.
4. 800 km. (500 mi.) and beyond:
Avoid prolonged full throttle operation.
Avoid engine speeds in excess of 7,000
rpm. Vary speeds occasionally.
CAUTION: If any engine trouble should oc-
cur during the break-in period, consult your
Yamaha dealer immediately.
Going uphill
When starting to climb a gentle grade, open
the throttle little by little to avoid loosing
engine speed and power. When climbing a
steep grade, shift down from THIRD to
SECOND or from SECOND to FIRST as re-
quired.
Going downhill
On a long downgrade or sharp descent, don't
rely on the brakes alone, but use the engine
compression as a brake; shift into THIRD or
SECOND as required by the grade and close
the throttle.