. MAINTENANCE MAINTENANCE PROCEDURE MAINTENANCE PROCEDURE 4 - 16 INITIAL 250 HOURS MAINTENANCE (ONLY AFTER THE FIRST 250 HOURS) Perform the following maintenance only after the first 250 hours. Replace f uel f ilter cartridge Change o il in engine oil pan, replace engine oil filte r cartridge For details o f th e method of maintaining , see EVERY 500 HOURS MAINTENANCE.