Most Common Ways Your Yamaha Outboard Engine Will Break Down
Have you noticed your Yamaha outboard motor not running at full power? Or, maybe it won’t start up at all? Possibly you find it turning over and dying out? Chances are it is caused by a common problem. Sometimes, the solution is a simple replacement of Yamaha parts that can be performed in minutes. To help you troubleshoot any potential issues, let’s look at some of the most common ways your Yamaha outboard will break down and how to fix these issues. Failure to Perform Regular Maintenance
Over the years, we’ve heard some boat owners ask “Why are boats so unreliable?” The truth is, Yamaha outboards are incredibly reliable but require regular maintenance to stay reliable. This maintenance must occur at recommended service intervals. Boater owners committed to regular maintenance will also often ask, “How many hours will a Yamaha outboard last?” While Yamaha does make a diverse line of outboard motors, most models will last 1,500 – 3,000 hours depending on how often it is maintained, stored, and used. Considering that the average boater racks up 50 hours of usage per season, owners can expect many years of use. This said, we commonly hear of Yamaha motors lasting well beyond 3,000 hours. Performing routine maintenance at the recommended intervals prevents many problems and significantly contributes to engine life and performance.
Fuel System Issues One of the most common ways your Yamaha outboard motor will break down is a fuel system failure. Whether you’re experiencing an intermittent bog down, poor performance, or complete engine failure, your fuel system is a common culprit.
Ethanol gasoline: Only use premium low-ethanol gasoline for your Yamaha outboard motor. The reason is that ethanol attracts water, causing fuel to dilute through “phase separation.” Additionally, ethanol gasoline can also gunk up fuel lines and fuel system components due to additives used. To help prevent these issues, regularly use a high-quality fuel stabilizer.
Fuel lines: Check your fuel lines. If you discover any breaks or leaks, you should stop using the engine and make any necessary replacements. Also, take a look at any fuel hoses with an interior liner.
Fuel filters: The fuel filter is designed to catch any debris and contaminants that have entered your fuel system. Regularly replace your fuel filters to keep fuel running freely.
Fuel pump: A malfunctioning fuel pump can significantly reduce engine performance and, over time, severely damage other components. If your fuel pump is not working correctly, replace it and any hoses that may have been affected.
Dry Starting a Yamaha Outboard A common mistake newer boat owners make is that they dry start their Yamaha outboard motor. A continually flowing water supply cools an outboard engine—without a supply of water to cool it, an outboard motor will overheat. Additionally, the impeller, which is lubricated by the water, will begin to warp due to the heat and friction, further exacerbating the problem. To fix this problem, check your impeller. If the impeller is misshapen, you will need to replace it. Replacement is a simple fix for most mechanics, but pay attention to any other issues that may have resulted from the dry start. Dry starting can cause serious engine issues and may require a rebuild by a licensed mechanic to restore it to working condition.
Shifting When the Engine Isn’t Running Yamaha outboard motors need to be running when switching gears. If your Yamaha outboard has cable controls for the throttle (versus electronic controls), you may experience some issues if you shift in and out of gear when the engine isn’t running. This will require some adjustments to the cable or may damage the clutch dog, causing a severe engine malfunction or failure if left unaddressed. Bad spark plugs are a common cause of electrical problems in outboard motors
Electrical System Your outboard’s electrical system may be responsible for your boat not starting or experiencing intermittent performance issues. You’ll first want to start by testing each part of the electrical system:
First, make sure your kill switch is firmly attached.
Next, for electric-starting models, you’ll want to check the main fuse to confirm it’s not blown. If you find that the connection at the center of the fuse is broken, you will need to replace it with one of the same amperage.
After verifying the fuse, check the battery. Safely disconnect the negative cable followed by the positive cable before removing the battery from its housing. With a wire-bristle brush, carefully scrape away any corrosion on the battery terminals. If the battery is damaged, you’ll need to replace it. If it is in good condition and shows no signs of damage, you can proceed to charge it. When it’s completely charged, reinstall the battery and cables (positive cable first, then negative).