Yamaha F50TLRC (2004) Parts & Diagrams

100-Hour / Annual Service Checklist

Most routine maintenance on the F50TLR can be performed with basic hand tools and a service manual. Staying on schedule prevents small issues from becoming expensive repairs, particularly corrosion and water pump failure.

1. Change engine oil and oil filter. Run the engine briefly to warm the oil before draining for a more complete flush.
2. Drain and refill lower unit gear case oil. Inspect the old oil for water contamination (milky color) or metal particles.
3. Replace the fuel filter element. On EFI models, also inspect the vapor separator tank screen.
4. Remove and inspect spark plugs. Replace if electrodes are worn, fouled, or gap is out of specification.
5. Inspect and replace the water pump impeller if it shows cracking, missing vanes, or has been in service for over 300 hours or two years.
6. Inspect all sacrificial anodes (trim tab, lower unit, cylinder block) and replace any that are more than 50% consumed.
7. Grease all zerk fittings — steering pivot, tilt tube, and propeller shaft splines — using Yamaha Marine Grease or equivalent.
8. Inspect the propeller for dings, bent blades, and fishing line wrapped around the shaft. Replace the prop shaft seal if line has contacted it.
9. Check the thermostat by removing and testing it in hot water. Replace if it does not open at the rated temperature (approx. 50°C / 122°F).
10. Inspect all fuel hoses, primer bulb, and connections for cracking, swelling, or leaks. Replace any deteriorated components.

• Pro Tip: Always run the engine on fresh water (using a flush adapter) after every saltwater outing. Even a 5-minute flush significantly reduces internal corrosion buildup in the cooling passages.
• Pro Tip: When changing gear case oil, fill from the bottom drain plug hole upward until oil flows from the vent hole. This ensures no air pockets and gives you a reliable fill level every time.