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Chapter 7

Chapter 7. Intermediate Small Engine Maintenance and Repair Projects. Parts of a carburetor can be easily viewed after the carburetor has been removed from the engine. Removing a carburetor requires removing other components, including the air-cleaner assembly, solenoid, and governor.

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Chapter 7

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  1. Chapter 7 Intermediate Small Engine Maintenance and Repair Projects

  2. Parts of a carburetor can be easily viewed after the carburetor has been removed from the engine.

  3. Removing a carburetor requires removing other components, including the air-cleaner assembly, solenoid, and governor.

  4. A float-type carburetor can be disassembled with a few common hand tools.

  5. Carburetor parts should be cleaned with carburetor cleaning solvent and inspected for wear or damage prior to reassembly.

  6. The flywheel is removed to inspect for damage and to inspect the key and keyway.

  7. If a lawn mower blade rotates for more than 3 sec after the brake bail is released, the brake pad or band may be worn or in need of adjustment.

  8. Brake pads are inspected for wear, measured for thickness, and tested for continuity after removal from a small engine.

  9. A brake system can be reassembled in six steps.

  10. A brake band has loops at both ends. It is mounted on a stationary and a movable post. A tang over the movable post prevents the brake band from dislodging during operation.

  11. A band brake is tested with a starter clutch adapter and torque wrench.

  12. If debris can be seen in the tank or the tank is leaking fuel, the fuel tank must be removed and cleaned.

  13. A fuel filter can be located outside the tank, midway along the fuel line.

  14. Briggs & Stratton mesh screen filters are color-coded red for 150µm, and white for 75µm.

  15. Fuel filters should be inspected periodically for the presence of dirt and other small particles.

  16. Fuel pumps must be periodically serviced due to ordinary use or to check for possible damage.

  17. Proper fuel system service requires adjusting the carburetor.

  18. An engine can be adjusted to true idle by removing the air-cleaner assembly and rotating the idle speed mixture screw while the engine is in operation.

  19. The high-speed fuel mixture on an engine is adjusted by rotating the high-speed mixture screw and moving the throttle lever.

  20. The choke linkage on a small engine is easily adjusted by loosening the cable mounting bracket screw and moving the cable casing until the choke is closed.

  21. A mechanical governor system is the most common type of governor system used on modern small air-cooled engines.

  22. A mechanical governor should be inspected for properly operating springs and linkages before maintenance service is performed.

  23. The static setting on a mechanical governor is adjusted to eliminate play between the governor crank (the arm that protrudes from the crankcase) and governor system components inside the crankcase.

  24. Governor adjustment mechanisms on small engines can consist of either multiple spring holes on the governor lever or a spring tension adjustment screw.

  25. If an engine races when controls are set to high, the top speed of the engine under no-load conditions must be reduced.

  26. When a governor contains two springs, the secondary spring must be adjusted to prevent stalls.

  27. The rewind starter must be replaced if the rope binds when it is pulled or does not rewind freely.

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