Honda BF20 BF2A Outboard Motors Manual, Page 34Get this manual
BF200BF2A
10CYLINDER HEADVALVES
aDISASSEMBLYREASSEMBLY
35 and 36 for removal and
installation of the valves and valve guides-JXHAUST VALVE
SPARK PLUG -
1141 CYLINDER HEAD
REASSEMBLY: Remove accumulated carbon deposits from the combustion chamber before installationInspect the cylinder head for warpage Loosen and tighten the bolts and nuts, in the order shownAfter tightening, measure cylinder compression (Page 11) -
STANDARD PLUG: BF20: BMR-4A (NGK) BF2A: BMR-4A (NGK), W14MR-U (ND) TIGHTENING TORQUE: 100-150 kg-cm (7.2-10.8 ft-lb)