The Yamaha NIKEN MXT850 requires regular and specialized maintenance to ensure optimal performance and longevity. Key maintenance intervals include changing the engine oil every 4,000 miles or 6,000 kilometers , replacing the oil filter every 8,000 miles or 12,000 kilometers, and checking spark plugs every 12,000 miles or 18,000 kilometers, with replacement needed every 24,000 miles or 36,000 kilometers. Additionally, the air filter should be replaced every 24,000 miles or 40,000 kilometers, or more frequently if riding in dusty or wet conditions. The brake fluid needs to be changed every 2 years, and the coolant should be changed every 3 years. The chain requires maintenance every 500 miles or 800 kilometers, including lubrication and checks for slack, alignment, and condition. Other periodic checks include valve clearances at 26,000 miles or 40,000 kilometers, steering bearing play and lubrication every 12,000 miles or 20,000 kilometers, and brake hose replacement every 4 years. These maintenance tasks are crucial for maintaining the bike's performance and safety.