Engine Break-In - Yamaha DT125R Owner's Manual

OPERATION AND IMPORTANT RIDING POINTS

Engine break-in

There is never a more important peri-
od in the life of your engine than the
period between 0 and 1,000 km. For
this reason, you should read the fol-
lowing material carefully.
Since the engine is brand new, do
not put an excessive load on it for the
first 1,000 km. The various parts in
the engine wear and polish them-
selves to the correct operating clear-
5
ances. During this period, prolonged
full-throttle operation or any condition
that might result in engine overheat-
ing must be avoided.
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0–500 km
8 Avoid prolonged operation above
6,000 r/min.
8 After every hour of operation,
stop the engine, and then let it
cool for five to ten minutes.
8 Vary the engine speed from time
to time. Do not operate the
engine at one set throttle posi-
tion.
500–1,000 km
8 Avoid prolonged operation above
7,000 r/min.
8 Rev the engine freely through
the gears, but do not use full
throttle at any time.
cC
After 1,000 km of operation, the
transmission oil must be changed.
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1,000 km and beyond
The vehicle can now be operated
normally.
cC
8 Keep the engine speed out of
8 If any engine trouble should
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5-4
the tachometer red zone.
occur during the engine break-
in period, immediately have a
Yamaha dealer check the vehi-
cle.
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