1983 Yamaha 30EN Outboards Service Manual, Page 18Get this manual
PERIODIC INSPECTIONS AND ADJUSTMENTS Introduction This chapter includes all information necessary to perform recommended inspections and adjustmentsThese preventive maintenance procedures, if followed, will ensure more reliable outboard motor operation and, longer service lifeThe need for costly overhaul work will be greatly reducedThis information appl ies to outboard motor already in service and to new outboard motor that are being prepared for saleAll service technicians should be familiar with this entire chapterMaintenance interval charts The following charts should be considered strictly as guide to general maintenance and lubrication intervalsDepending on operating conditions (e.g fishing, cruising, water skiing, etc, the intervals of maintenance shou ld be changedFor instance, when the outboard motor has been used on stormy or rough seas, the intervals should be shortened Periodic maintenance
unithours Initial Item Fue tank Fuel line (Fue tank) Fue fi lter Fuel line (Motor) Carburetor Spark plug (s) Cleanlush Check all hoses for cracking and leakageReplace if necessary CleanF lush Check for cracking and leakage Rep lace if necessary Check operationAdjust if necessary InspectClean and adjustReplace if necessary Check head bolts for tightnessTorq ue bolts to specification if necessary Decarbon ize Ignition timing Ign ition and trouble synchro mechanism Throttle mechanism Cooling system Anode (Trim tab) Propeller Cotter pin (propeller nut) CheckAdjust if necessary Remarks Thereater every