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The Yamaha XSR 155 is powered by a featuring Variable Valve Actuation (VVA). To keep this engine running smoothly, follow these core maintenance steps: Engine Oil Every 900–1,000 km (or as per regional guide) Oil Filter Every 3,000 km Air Filter Clean/Replace Clean every 3,000 km; Replace at 12,000 km Spark Plug Every 15,000 km Chain Clean & Lube Regularly, especially after rain or dusty rides Why You Need the Full Service Manual Yamaha Xsr 155 Service Manual Pdf