Honda BF50 (5HP), BF5A Outboard Motors Shop Manual 2014, Page 16Get this manual
BF50BF5A IGNITION SYSTEM
HARD STARTING
Test the spark plug Plug gap: 0.7-0.8 mm (0.027-0.031 in)
Check again with new spark plug
No spark Sparks Faulty spark plugInstall new spark plug
No spark Sparks Faulty spark plug capI nstall new spark plug cap
Check again with new spark plug capNo spark
Disconnect the black wire from the engine switch and recheckNo spark
Faulty engine switchReplace engine switch
Defective transistorized ignition coilReplace transistorized ignition coil