Yamaha RD250(C) Owner's Manual page 70

Each füll throttle acceleration sequence
should be followed w i t h a substantial rest
period for the ehgine by cruising at lower
r.p.m.'s so the engine can rid itself of the
temporary build up of heat.
If any abnormality is noticed during this
period, ask your Y a m a h a dealer to check.
1. 0 ~ 5 0 0 k m :
A v o i d Operation above 4 , 0 0 0 r.p.m.
A l l o w a cooling off period of 5 to 10
minutes after every hour of Operation.
Vary the speed of the motorcycle from
time to time. Do not operate it at one,
set throttle position.
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