Yamaha 9.9F Owner's Manual page 26

Installation
your Yamaha dealer. WARNING! Avoid
using bolts, nuts or washers other
than those contained in the engine
packaging. If used, they must be of at
least the same quality of material and
strength and must be tightened se-
curely. After tightening, test run the
engine and check their tightness.
[EWM00651]
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