Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 243Get this manual
Engine Does Not Run Smoothly Faulty automatic SE valvesoonIdle speed is not stable or stallsSpark plug faulty3-3 1) and 15
1 misadjusted
Adjust: P3-2
+ Carburetor slow circuit clogged
Overhaul the carburetor(Section
Carburetor fl againIf still not good, overhaul the carburetor (Section 5)
- Secondary air from loose carburetor mounting bolts andor damaged carburetor insulator and gasket
Retighten the carburetor mounting bolts securely (P5-3 and 517)Replace the insulator or gasket (P5-8 and 9)