cooling YAMAHA YFM50S 2004 Manuale de Empleo (in Spanish)

6-21
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:
8Avoid continuous operation above half throt-
tle. 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 throttle position.
10–20 hours:
8Avoid 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:
8Avoid prolonged full throttle operation. Vary
speeds occasionally.
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