Yamaha BIG BEAR YFM400S Owner's Manual page 63

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Each full throttle acceleration sequence
should be followed with a substantial rest pe-
riod 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 peri-
od, consult a Yamaha dealer.
0–10 hours:
Avoid continuous operation above half throt-
tle. Allow a cooling off period of five to ten min-
utes 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:
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:
Avoid prolonged full throttle operation. Vary
speeds occasionally.
6-8

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