Honda BF50 (5HP), BF5A Outboard Motors Shop Manual 2014, Page 15Get this manual
BF50BF5A
bPOOR PERFORMANCE
Wet fouled spark plug caused by improper choke operation Faulty spark plug Flooded carburetor Improperly adjusted pilot screw Air leaking past carburetor insulator caused by damaged gasket
I ENGINE STARTS BUT SOON STOPS
I ENGINE SPEED WILL NOT INCREASE: ENGINE SPEED WILL NOT DROP
Fouled or faulty spark plug Choke stuck closed Improper valve timing Water in carburetor Overheating Improper valve seat contact Binding of throttle cable Faulty carburetor throttle valve Improperly adjusted throttle opener Clogged carburetor slow jet Improperly adjusted pilot screw Lean fuel-air mixture Air leaking past carburetor insulator caused by damaged gasket No fuel in tank Poorly installed throttle opener tube Insufficient lubricating oil Faulty oil pump Clogged or damaged water tube Faulty water pump Faulty thermostat Clogged water intake hole