1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 18Get this manual
Periodic maintenance Initial Item Fuel tank Fuel line (Fuel tankl Fuel filter Fuel line (Motod Carburetor Spark plug(sl Cylinder head Ignition timing Ignition and throttle synchromechan ism Throttle mechanism Cooling system CleanFlush Check all hoses for cracking and leakage Replace if necessary CleanFlush Check for cracking and leakage Replace if necessary Check operation Adjust if necessary nspectClean and adjustReplace if necessary Check head bolts for tightnesslTorque bolts to specification if necessary Decarbonize Check Adj ust if necessary Check ignition and throttle synchro-mechanism for proper operation Adjust if necessary Check throttle mechanism for proper operation Adj ust if necessary Check pilot waterCheck water pump and water passage if necessary
Unit: hours Thereafter every 100
Remarks
Lubrication intervals
Unit: hours Type (Recommended lubricantsl Initial 10 Check Check