1971 Johnson 125HP outboards Service Manual, Page 55Get this manual
polished to dull lusterSee Figure 5-23
Finish surfacing with No180 emery clothNOTE
Cylinder block and crankcase must be completely clean of all foreign matter prior to reassemblyUse Solvasol for cleaningDO NOT scratch cylinder head gasket surfaces of cylinder
Figure 5-22Breaking Cylinder Glaze CRANKSHAFT SEAL RINGS
Figure 5-23Surfacing Cylinder Head