Honda BF75, BF100, BF8A Outboard Motors Shop Manual, Page 114Get this manual
CONSTRUCTION AND FUNCTION Spark Advancer
The spark advancer is housed in the cam pulleyWhen engine speed increases, centrifugal force moves the advancer weights (11) outward, causing the rotor (10) to turn in the direction shown by the arrowsThis advances ignition timing in proportion to engine rpm
Oil Pressure Warning Device