Yamaha T50TLRC (2004) Parts & Diagrams

100-Hour / Annual Service Checklist

Most routine maintenance on the T50TLR can be performed with basic hand tools and a service manual. Staying on top of scheduled service prevents small issues from becoming expensive repairs, and keeps the motor running at peak efficiency.

1. Replace all three spark plugs and check ignition timing.
2. Inspect and clean or rebuild carburetors; replace fuel filter element.
3. Drain and refill lower unit gear oil — check for water contamination (milky appearance).
4. Replace water pump impeller, gasket, and wear plate.
5. Inspect thermostat operation; replace if sticking.
6. Grease all zerk fittings (steering tube, tilt tube, prop shaft, swivel bracket).
7. Inspect fuel lines and primer bulb for cracks, swelling, or softness.
8. Check anode condition on the lower unit and transom bracket; replace if more than 50% eroded.
9. Inspect the propeller for dings, bent blades, and fishing line wrapped around the shaft. Replace prop shaft seals if line has been present.
10. Verify operation of the safety lanyard (kill switch) and all warning systems.

• Pro Tip: On 2-stroke Yamahas with Autolube, periodically inspect the oil injection pump linkage for proper synchronization. A mis-adjusted pump can cause a lean condition and serious powerhead damage.
• Pro Tip: Always use TC-W3 certified 2-stroke oil. Non-certified oils can leave excessive carbon deposits on piston rings and exhaust ports, reducing power and reliability over time.