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Mat Angiwan III
Mat Angiwan III

ManualYamaha5BS661


Manual Yamaha 5BS 661




The Yamaha 5BS 661 is an outboard motor that was produced in the 1970s and 1980s. It is a two-stroke, single-cylinder engine that has a displacement of 103 cc and a power output of 5 hp. It is suitable for small boats and fishing vessels. This article will provide some information on how to operate, maintain and repair this outboard motor.


Operation




To start the engine, follow these steps:


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  • Check the fuel level and the oil mixture ratio. The recommended fuel is regular unleaded gasoline with an octane rating of 87 or higher. The recommended oil is Yamalube 2M or equivalent two-stroke engine oil. The oil mixture ratio is 100:1 (1 liter of oil for every 100 liters of fuel).



  • Connect the fuel hose to the fuel tank and the engine. Make sure the fuel valve is open and there are no leaks.



  • Turn the engine stop switch to the ON position.



  • Set the throttle lever to the START position.



  • Pull the choke knob out fully.



  • Pull the starter rope gently until you feel resistance, then pull it briskly.



  • When the engine starts, push the choke knob in gradually as the engine warms up.



  • Adjust the throttle lever to the desired speed.




To stop the engine, follow these steps:



  • Set the throttle lever to the IDLE position.



  • Turn the engine stop switch to the OFF position.



  • Disconnect the fuel hose from the engine and drain the remaining fuel from the carburetor by loosening the drain screw.




Maintenance




To keep the engine in good condition, perform the following maintenance tasks regularly:



  • Check and replace the spark plug if necessary. The recommended spark plug is NGK BP6HS or equivalent. The spark plug gap should be 0.6-0.7 mm.



  • Clean and lubricate the propeller shaft and replace the gaskets if necessary. The recommended lubricant is Yamaha marine grease or equivalent.



  • Clean and inspect the fuel filter and replace it if necessary. The fuel filter is located inside the fuel tank.



  • Clean and adjust the carburetor if necessary. The carburetor has three screws: idle speed screw, idle mixture screw and main jet screw. Refer to the owner's manual for more details on how to adjust them.



  • Clean and inspect the cooling system and remove any debris or obstructions from the water intake and outlet holes.



  • Clean and inspect the ignition system and replace any damaged or worn parts.



  • Clean and inspect the recoil starter and replace any damaged or worn parts.




Repair




If you encounter any problems with your engine, you can try to troubleshoot them using the following table:


Problem Possible cause Solution --- --- --- Engine does not start No fuel or improper fuel Check fuel level and quality, refill or replace if necessary Spark plug fouled or defective Clean or replace spark plug Engine stop switch in OFF position Turn engine stop switch to ON position Choke knob not pulled out Pull choke knob out fully Starter rope not pulled properly Pull starter rope gently until resistance, then briskly Engine starts but runs poorly Choke knob not pushed in Push choke knob in gradually as engine warms up Carburetor out of adjustment Adjust carburetor screws according to owner's manual Fuel filter clogged or dirty Clean or replace fuel filter Air filter clogged or dirty Clean or replace air filter Engine overheats Cooling system clogged or defective Clean and inspect cooling system, remove any debris or obstructions Oil mixture ratio too lean Increase oil mixture ratio to 100:1 Engine knocks or pings Fuel octane rating too low Use regular unleaded gasoline with octane rating of 87 or higher Spark plug gap too wide Adjust spark plug gap to 0.6-0.7 mm Engine loses power or stalls Fuel tank empty or fuel hose disconnected Refill fuel tank or reconnect fuel hose Throttle lever not set properly Adjust throttle lever to desired speed Propeller damaged or fouled Clean or replace propeller Engine stop switch in OFF position Turn engine stop switch to ON position If you need more information or assistance, you can consult the owner's manual or contact a Yamaha dealer. You can also find some helpful resources online, such as the Boat Design Net forum where other users share their experiences and tips on the Yamaha 5BS 661.




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