Yamaha T8C User Manual (English)

Questions and Answers:

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Gregory BentleyAug 19, 2025
Why is my Yamaha Outboard Motor losing power?
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  David BatesAug 19, 2025
  If you're experiencing power loss with your Yamaha Outboard Motor, several factors could be responsible. Start by inspecting the propeller for damage and have it repaired or replaced if necessary. Check that the propeller's pitch and diameter are correct for optimal speed. Adjust the trim angle for efficient operation. Ensure that the boat bottom is clean from marine growth, and the gear housing isn't tangled with weeds or other foreign matter. Inspect the spark plugs, replacing them if they are fouled or incorrect. Also, make sure that you are using the specified engine oil. Check the fuel lines and filter for obstructions or clogs, and use clean, fresh fuel.
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christina50Aug 22, 2025
How to fix irregular idling or stalling in a Yamaha Outboard Motor?
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  Leah SmithAug 22, 2025
  If your Yamaha Outboard Motor idles irregularly or stalls, there are several potential causes to investigate. Begin by checking the spark plugs; if they are fouled or the incorrect type, clean or replace them. Inspect the fuel system for any obstructions, such as pinched or kinked fuel lines. Ensure that you're using clean, fresh fuel. Clean or replace the fuel filter if it's clogged. Also, make sure that the air vent screw on the fuel tank is open and the choke knob is in home position. If applicable, ensure the fuel joint connection is correct and the battery lead is securely connected. Check that the motor angle is at normal operating position.
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Jessica BellAug 26, 2025
What to do if the warning buzzer sounds on my Yamaha T8C?
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  raymond01Aug 26, 2025
  If the warning buzzer sounds or the indicator lamp lights on your Yamaha Outboard Motor, it could be due to several oil-related issues. First, check the engine oil level and fill the oil tank with the specified engine oil if it's low. Ensure that you are using the specified engine oil; if not, replace it with the correct type. Also, consider whether the engine oil is contaminated or deteriorated, and replace it with fresh, specified oil if needed.
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Christine GalvanAug 28, 2025
What to do if my Yamaha T8C engine will not start but the starter operates?
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  Shannon NewmanAug 28, 2025
  If your Yamaha Outboard Motor's engine isn't starting but the starter is working, here are some things to check: * Make sure the fuel tank isn't empty and is filled with clean, fresh fuel. * Inspect the spark plugs, cleaning or replacing them with the recommended type if they are fouled or incorrect. * Check the spark plug caps to ensure they are correctly fitted. * Verify that the engine stop switch lanyard is attached. Also, examine the fuel filter for clogs, check for damaged ignition wiring or loose connections, and ensure you're using the correct starting procedure. If problems persist, it may be necessary to have a Yamaha dealer service the fuel pump, ignition parts, or internal engine components.
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Catherine GarciaAug 31, 2025
Why does my Yamaha T8C Outboard Motor engine idle irregularly or stall?
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  Dr. Alexander JohnsonAug 31, 2025
  An irregular idle or stalling in your Yamaha Outboard Motor can stem from several causes. Start by inspecting the spark plugs for fouling or incorrect type, and clean or replace them as needed. Check the fuel system for any obstructions, pinched lines, or stale fuel. Ensure the fuel filter is clean. Also, verify that the air vent screw on the fuel tank is open, the choke knob is in the home position, and the motor angle is at the normal operating position. Other potential issues include incorrect carburetor adjustments, a disconnected battery lead, or activation of the warning system. Addressing these points should help stabilize the engine's idle. If problems persist, consider having a Yamaha dealer check the ignition parts, thermostat, carburetor, fuel pump, or throttle valve adjustment.
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Emily RiosSep 3, 2025
How to troubleshoot a Yamaha T8C when the starter will not operate?
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  Brian MorrisSep 3, 2025
  If the starter on your Yamaha Outboard Motor won't operate, start by checking the battery. It might be weak or have low capacity, so ensure it's in good condition and has the recommended capacity. Also, check the battery connections for looseness or corrosion; tighten the cables and clean the terminals if needed. Verify that the shift lever is in neutral. If a fuse for the electric start circuit is blown, identify the cause of the overload, repair it, and replace the fuse with one of the correct amperage.
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Susan WatsonSep 6, 2025
What to do if my Yamaha T8C engine will not start, but the starter is working?
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  Matthew Pham DDSSep 6, 2025
  If your Yamaha Outboard Motor's engine won't start but the starter operates, begin by checking the fuel level; the tank may be empty. Ensure the fuel is clean and fresh, replacing it if contaminated or stale. Inspect the fuel filter for clogs and clean or replace it if necessary. Make sure the engine stop switch lanyard is attached. Check the spark plugs; if they're fouled or the wrong type, clean or replace them with the recommended type. Also, check the spark plug caps to be sure they are correctly fitted. Examine the ignition wiring for damage or loose connections, and repair or tighten as needed.
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Pamela CalderonSep 9, 2025
Why is my Yamaha Outboard Motor vibrating so much?
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  Mr. Edward ContrerasSep 9, 2025
  If your Yamaha Outboard Motor is vibrating excessively, check the following: 1. Inspect the propeller for any damage and have it repaired or replaced if necessary. 2. Remove any weeds or foreign matter tangled on the propeller. 3. Tighten any loose motor mounting bolts and the clamp screw. Also, check if the steering pivot is loose or damaged and tighten it.
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Angela RodriguezSep 12, 2025
How to fix a Yamaha T8C Outboard Motor when the starter will not operate?
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  krystalmcgrathSep 12, 2025
  If the starter on your Yamaha Outboard Motor isn't working, begin by checking the battery. Ensure it has sufficient capacity and that the connections are tight and free of corrosion. Replace any blown fuses for the electric start circuit with a fuse of the correct amperage. Also, make sure the shift lever is in neutral. If these steps don't resolve the issue, it's possible that the starter components are faulty, requiring service by a Yamaha dealer.

Yamaha T8C Specifications

General

Horsepower	8 hp
Fuel Induction System	Carburetor
Fuel Type	Gasoline
Starting System	Manual
Ignition System	CDI
Exhaust	Through Propeller
Cooling	Water
Shaft Length	15 in