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How do I Troubleshoot the Ignition on a Yamaha Warrior?


    • 1). Use the Warrior's starter. If the engine will not turn over, then there is likely a problem with the electrical system that is preventing the ignition from getting power. Start by checking the quad's main fuse.

    • 2). Locate the Warrior's fuse case, situated below the quad's fender. Remove the main fuse with a pair of pliers.

    • 3). Inspect the connection at the center of the fuse. If this connection is broken, then the fuse has blown. Replace it with a new 15-amp fuse.

    • 4). Inspect the battery next. Access the battery case by removing the Warrior's seat bolts and seat.

    • 5). Disconnect the negative (-) lead. Then disconnect positive (+) one. Remove the battery from its case.

    • 6). Clean the battery terminals using baking soda and water if they are dirty.

    • 7). Replace the battery if it is damaged. The Yamaha Warrior takes a 12 volt, 12 ampere-hour battery.

    • 8). Use a separately-powered battery charger to fully charge the battery.

    • 9). Reinstall the battery. Connect the positive lead first this time, followed by the negative one.

    • 10

      Use the electric starter. If the Warrior's engine still won't turn over, take the quad to a certified dealer for electrical system inspection.

    Spark Plug

    • 1). Check the spark plug if the engine does turn over but the Warrior still will not start. This is one of the most critical but delicate components of the ignition system.

    • 2). Locate the spark plug inside of the engine's only cylinder. Remove the spark plug cap and use a spark plug wrench to unscrew and remove the plug.

    • 3). Examine the spark plug's insulator tip. If it is cracked or burnt, it is likely damage. Replace it with another NGK DR8EA plug.

    • 4). Measure the spark plug gap using a wire thickness gauge. This gap should measure between 0.02 and 0.03 inches for the Yamaha Warrior.

    • 5). Shorten the spark plug gap if it is too wide by pressing the hook-end of the plug against a firm, flat surface.

    • 6). Use a spark plug gap tool to pull the hook-end wider as needed.

    • 7). Reinstall the spark plug and plug cap.

    • 8). Operate the starter again. Take the Warrior to the shop if ignition problems continue.

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