8-528EBU27691Troubleshooting chartsStarting problems or poor engine performanceCheck the fuel level inthe fuel tank.1. Fuel There is enough fuel.There is no fuel.Check the compression.Supply fuel. The engine does not start.Check the compression.Operate the electric starter.2. Compression There is compression.There is no compression.Check the ignition.Have a Yamaha dealercheck the ATV.Remove the spark plugand check the electrodes.3. Ignition Wipe off with a dry cloth and correct thespark plug gap, or replace the spark plug.Have a Yamaha dealer check the ATV.The engine does not start.Have a Yamaha dealercheck the ATV.The engine does not start.Check the battery.Operate the electric starter.4. Battery The engine turns overquickly.The engine turns overslowly.The battery is good.Check the battery lead connections,and charge the battery if necessary.DryWet Operate the electric starter.
