Yamaha RD350B - Engine Break-in Procedures

6. Break-in
THERE IS NEVER A MORE IMPORTANT PERIOD. IN
THE LIFE OF YOUR YAMAHA THAN THE PERIOD
BETWEEN ZERO AND 1.000 km. For this reason we
ask that you carefully read the following material.
Because the engine is brand new, you must not put an
excessive load on it during the first several hours of
running you could look at it in this manner: During the
first 500 km. the various parts in the engine wear and
polish themselves to the correct operating clearances.
During this period prolonged füll throttle Operation, or
any condition which might result in excessive head
and cylinder temperatures must be avoided.
However, momentary füll throttle Operation (2 ~ 3
seconds maximum) does not harm the engine. Each
füll throttle acceleration sequence should be followed
with a substantial rest period for the engine by
cruising at lower rpm's so that the engine can ride
itself of the temporary build up of heat. The method
for breaking in your Yamaha is quite simple.
operating ränge most comfortable and most efficient
for the engine.
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