Yamaha F50 Service Manual
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62Y3A115-4 1 2 3 4 5 6 7 8 I Symptom: Engine can be started, but does not remain on. Check the fuel system. Check the ignition system. Check the compression pressure of power unit. Is the vent screw open? Water or resi- due? Good operat- ing condition? Kinks or fuel leakage? Replace the pri- mary fuel pump. Check for water or residue in the fuel filter. Open the fuel vent screw. Replace the respective parts. Clean the fuel system from the fuel tank to the fuel filter. Check the fuel hose for kinks or fuel leakage. Check the carbure- tors. No Yes Yes Yes Yes No No No Check the primary pump operation. Check that the fuel vent screw of the fuel tank is open. Troubleshooting
POWRPower unit 5-562Y3A11 Is there air intake?Replace the respective seals. Check the compression pres- sure of the combustion chamber. No Yes Check that there is no secondary air intake on the contact surfaces of the intake manifold and crankcase. Check the ignition spark gap using the spark gap tester. Out of specifi- cation? Replace the spark plug. Check the ignition system out- put peak voltage. Yes No
62Y3A115-6 1 2 3 4 5 6 7 8 I Symptom: The engine idle speed is not steady, but increases or decreases. Check the carburetors. Check the air intake system. Check the ignition system. Replace the CDI unit. Check and disassemble the car- buretors, and then clean them if necessary. Check the throttle cable opera- tion and lubricate it if necessary. Out of specifi- cation? Do the valves close simul- taneously? Do the valves close simul- taneously? Check the second- ary air intake on the O-ring and manifold plate, and the gas- kets of the vacuum check bolts. Check the ignition timing. Yes No No Yes No Yes Check the operation of the car- buretor throttle valves by removing the throttle cables and link rods. Check the operation of the car- buretor throttle valves. Troubleshooting
POWRPower unit 5-762Y3A11 Symptom: Engine does not accelerate when the throttle is opened quickly. The engine turns off when the throttle is opened quickly. Acceleration is tardy and the engine is likely to stop at any moment. Check the carburetors. Check the ignition system. Check the compression pressure of power unit. Check the needle valve of the carburetor for debris or wear. Adjust the throttle cable. Check each jet of the carburetor for clogs or debris. Clean or replace the respective parts. Debris or wear? Check the ignition system and the compression pres- sure of the engine. Clogs or debris? Yes No Yes Yes No No Check the throttle cable opera- tion. Clean the carburetor, or replace respective parts. Do the carbu- retor throttle valves close simulta- neously?
62Y3A115-8 1 2 3 4 5 6 7 8 I Symptom: Engine can run, but engine speed will not increase. Overheat warning indicator is on. Oil pressure warning indicator is on. Warning indicator is on and buzzer is sounding. Check the water cooling system. Check the lubricating system. Check the water inlet for clogs or debris. Check the thermoswitch. Check that cooling water is dis- charged from the pilot water outlet. Replace the thermostat. Replace the CDI unit. Replace the thermoswitch. Check the water pump impeller. Check the water passage. Clogs or debris? Is water dis- charged? Good condi- tion? Good condi- tion? Good condi- tion? Clean the water inlet. Yes No No Yes Yes Yes No No Check the thermostat operation. Replace the impel- ler. No Yes Troubleshooting
POWRPower unit 5-962Y3A11 Check the oil pump for debris or wear. Check the engine oil level. Check the oil pressure. Check the oil pressure switch.Clean or replace the respective parts. At specified level? Out of specifi- cation? Good condi- tion? Debris or wear?Check the oil pas- sage. Yes No Yes No Yes Yes No No Add engine oil to the correct level. Replace the oil pressure switch. Replace the CDI unit.
62Y3A115-10 1 2 3 4 5 6 7 8 I Special service tools5 Compression gauge YU-33223-1 Flywheel magnet holder YB-06139 Universal puller YB-06117 Crankshaft holder YB-06562 Valve spring compressor YM-01253Valve guide remover YM-01122 Valve guide reamer YM-01196 Valve seat cutter set YM-91043-C Drive shaft needle bearing depth stop YB-34473 Oil filter wrench YU-38411 For USA and Canada Special service tools
POWRPower unit 5-1162Y3A11 Piston ring compressor YU-33294 Compression gauge 90890-03160 Flywheel holder 90890-06522 Flywheel puller 90890-06521 Crankshaft holder 18 90890-06562Valve spring compressor 90890-04019 Valve spring compressor attachment 90890-06320 Valve guide remover/installer 90890-06801 Valve guide reamer 90890-06804 Valve seat cutter holder 90890-06316 For worldwide
62Y3A115-12 1 2 3 4 5 6 7 8 I Valve seat cutter 90890-06315, 90890-06323, 90890-06326, 90890-06328, 90890-06555 Bearing outer race attachment 90890-06626 Oil filter wrench 90890-01426 Piston slider 90890-06529 Special service tools