Helpful Maintenance Tips Fuel . Nearly 75% of engine problems have to do with fuel. Fuel begins to separate after 2 weeks . Add fuel stabilizer to extend the fuel life by 6 months at fill up. . Change fuel filter and water separator every year. . Check prop blades often-bent blades will cause 5-15% increase in fuel consumption/ performance. . Clean your spark arrestor (carburetor filter) annually. Battery . Never start engine without a fully charged battery. If disconnected, a battery will keep charged for approximately 6 months. . Watch out for pre-programmed stereo! They can draw at least 1 to 2 amps a day. . EFI and the larger 2 and four stroke outboards take a minimum battery size of 650 CCA's. Oil/grease/filters . Change oil/filter at least once a year regardless of use if have an outdrive or lower gearcase change at least once a year too! . Grease prop shaft make sure you have the prop nut set to proper torque. . EXTEND THE LIFE OF YOUR ENGINE by preventing overheating: change your impeller every 2 years or 100 hours!