Honda BF135A, BF150A Outboard Motors Shop Manual., Page 347Get this manual
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BF135ABF150A dASSEMBLY
[11] 9.5 1.9 mm O-RING (2) Do not reuse
THERMOSTAT (50'C: For cylinder head)
[9] ECT SENSOR 2
[5] 18.5 mm CLAMP