1987 Johnson/Evinrude CU Outboards 35A thru 55 Service Manual, Page 76Get this manual
& General Safety Warnings The engine cover is machinery guardUse caution when servicing running engineDo not wear jewelry or loose clothing To avoid accidental starting of engine while servicing, twist and remove all spark plug leads Check nonmetallic fuel systems parts for signs of deterioration, cuts, cracking or abrasion Always replace with specified parts Do not attempt to run engine with any fuel system component disconnected or removedFuel leakage could contribute to fire or explosion After completing any service procedure, momentarily pressurize fuel system and check for leaks! Fuel leakage could contribute to fire or explosion When using shop air for cleaning or drying parts: aBe sure air supply is regulated to not more than 25 psi (172 kPa) bBe sure you use appropriate eye protection to avoid personal injury Replace any locking fastener (locknut or patch screw) if its locking feature becomes weakDefinite resistance to tightening must be felt when reusing locking fastenerIf replacement is indicated, use only authorized replacement or equivalent