Honda BF15D BF20D Outboard Motors Shop Manual., Page 191Get this manual
3.PISTON aREMOVAL
1) Remove the engine (Section 8) and remove the following:flywheel and timing belt drive pulley (P9-2)- silencer and carburetor (P6-2)fuel pump and fuel filter (P6-16)- cylinder head (P11-2)2) Remove the four 22 mm flange bolts and crankcase
[I]SIDE COVER GASKET
CRANKCASE SIDE COVER
side cover and side cover gasket3) Turn the crankshaft until the piston is at top dead center
4) Remove the connecting rod bolts and connecting rod