1971 Johnson 125HP outboards Service Manual, Page 7Get this manual
1-3 Service Manual, in many cases in actual useRefer to the Special Service Tool Catalog for description and ordering instructions for these tools OUTBOARD MOTOR NOMENCLATURE
Sometimes the words "right" and "left" are very confusing when referring to the sides of an outboard motorTherefore, the sides are referred to as STARBOARD or PORT sidesSTARBOARD means on the right hand while facing the bow (FRONT) of the boat; PORT means left handSee Figures 1-1 and 1- 2Service required for the 125 HP motors is generally one of three kinds 1NORMAL CARE AND MAINTENANCE, which includes putting new motor into operation, storing motors, lubrication, and care under special operating conditions such as salt water and cold weather2OPERATING MALFUNCTIONS due to improper motor mounting, propeller condition or size, boat condition, or the malfunction of some part of the motorThis includes motor tune-up procedures to keep the motor in prime operating condition3COMPLETE DISASSEMBLY and overhaul, such as inspecting motor that has been submerged or rebuilding trade-in unitsIt is important to you as the service man to determine before disassembly just what the trouble is, and how to correct it quickly and with minimum expense to the ownerThis section of the manual is designed to help you diagnose motor malfunctions and correct them