Honda BF50 (5HP) BF5A Outboard Motors Shop Manual., Page 81Get this manual
SF5OeBF5A
7HALF THROTTLE SYSTEM
aDESCRIPTION
The half throttle system limits the carburetor throttle opening when the shift lever in "NEUTRAL" and "REVERSE" positionsIt prevents the engine from overrevving no load and controls the reverse speed of the boat
bCONSTRUCTION
REVERSE
NEUTRAL FORWARDI
[I] THROTTLE ARM