Honda BF75D Owner's Manual page 132

TECHNICAL INFORMATION
BF75D/BF90D Tune up
Spark plug gap
Idle speed
Valve clearance (cold)
Other specifications
130
0.031-0.035 in (0.8-0.9 mm)

750 50 rpm

Intake: 0.17 0.02 mm

Exhaust: 0.28 0.02 mm
No other adjustment is needed
See page 86
See shop manual
See shop manual