YAMAHA 300-HOUR OUTBOARD SERVICE

Replace engine oil and oil filter using Yamaha-specification products, helping maintain proper lubrication and protect internal engine components. 

Drain and replace lower unit gear lubricant and inspect the used lubricant for signs of water intrusion or abnormal wear. 

 Inspect the water pump impeller and housing, and replace components as required based on condition and the applicable Yamaha maintenance schedule.

 Inspect fuel-system components for visible signs of leaks, deterioration, damage, or other conditions that could affect reliable engine operation.

Inspect and service applicable engine-mounted fuel filters and the external fuel-water separator as required based on condition and Yamaha maintenance recommendations. 

Remove and inspect spark plugs for condition and wear, and replace them when required by the applicable Yamaha maintenance schedule or condition. 

Inspect the propeller and lower unit for visible damage, fishing line, fluid leakage, and other conditions that could affect performance or reliability. 

Inspect thermostat operation and condition, and replace as required by the applicable Yamaha maintenance schedule or inspection findings. 

Inspect the timing belt for wear, cracking, damage, or other deterioration, and replace as required by the applicable Yamaha maintenance schedule or condition. 

Inspect applicable intermediate fuel filters and replace as required based on condition and the applicable Yamaha maintenance schedule. 

Inspect applicable diaphragm-style fuel pumps and replace as required based on condition and the applicable Yamaha maintenance schedule. 

Perform a Yamaha Diagnostic System (YDIS) check after scheduled maintenance to review available engine information and identify stored or active diagnostic information that may require further attention. The customer receives a YDIS report documenting the diagnostic results.