Johnson and Evinrude are brand names synonymous with outboard boat engines. Although these outboards are known as sturdy and reliable, wear and tear inevitably occurs with any nautical equipment that has multiple moving parts. Most outboard motor problems related to normal wear are fairly simple to remedy, whether it be replacing a corroded spark plug or a damaged fuel line. In a few basic steps, you can troubleshoot many outboard problems to get your motor running and avoid more extensive, and expensive, repairs.
Check the fuel tank for sufficient fuel. Make sure fuel lines are not damaged or have holes in them. Test the rubber fuel primer bulb for evidence of hardness. Have a mechanic replace the fuel line assembly if the lines are damaged.
Inspect the motor's spark plugs for corrosion or dirt if the engine does not respond. Clean or replace them as needed.
Check the engine for correct compression pressure. Remove the spark plugs with the wrench and attach the compression test gauge. Correct pressure should register around 90 PSI (pounds per square inch). Any reading below 60 PSI will require a mechanic to troubleshoot the problem for you.
Look for oil inside the engine cover. Remove the plastic engine cover and check for oil residue. if you notice oil, it may be that the motor's rings are bad and a qualified mechanic should inspect the motor.
Inspect the engine seals or gaskets for damage. Damaged gaskets can cause a vacuum leak within the engine. Inspect the fuel pump cowling for any cracks. Cracks in the fuel pump cowling can compromise the vacuum when priming the rubber fuel bulb.
Pour a small mixture of oil and fuel into the carburetor if you are unable to start the engine, even after priming the fuel bulb. Pull the starter rope at the same time to start the engine.
