Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 297Get this manual
MECHANICAL DECOMP INSPECTION Inspect that the decompressor weight moves smoothly, and spring is not weak or worn,
[I] DECOMP WEIGHT
[2] SPRING
ROCKER ARM SHAFT INSTALLATION
Loosen the valve adjusting screw of each locker arm fullya Place the rocker arms, rocker arm springs and rocker arm collars noting the installation directiona Install the rocker am shafts with cutout facing out side and align the cutout with the bolt hole of the cylinder head[CYLINDER HEAD