Yamaha BLASTER YFS200S Owner's Manual page 151

Each full throttle acceleration sequence should
be followed with a substantial rest period for the
engine by cruising at lower r/min so the engine
can rid itself of the temporary build up of heat.
If any abnormality is noticed during this period,
consult a Yamaha dealer.
0–10 hours:
8 Avoid continuous operation above half
throttle. Allow a cooling off period of five to
ten minutes after every hour of operation.
Vary the speed of the machine from time
to time. Do not operate it at one set throt-
tle position.
10–20 hours:
8 Avoid prolonged operation above 3/4
throttle. Rev the machine freely through
the gears but do not use full throttle at any
time.
After break-in:
8 Avoid prolonged full throttle operation.
Vary speeds occasionally.
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