Introducing the Z400 LT-Z400, a robust and versatile ATV manufactured between 2003 and 2008. This first-generation model is engineered for demanding off-road adventures, featuring a powerful 398 cc 4-stroke liquid-cooled engine with a 9.2:1 compression ratio and a Mikuni BSR36 carburetor for efficient fuel delivery. Its reliable chain drive system is paired with a 5-speed manual transmission, offering precise control. The Z400 LT-Z400 boasts impressive ground clearance of 265 mm and a sturdy chassis equipped with adjustable telescopic front forks and a swingarm with an adjustable monoshock rear suspension, complemented by dual hydraulic disc brakes up front and a single hydraulic disc brake in the rear for superior stopping power. This comprehensive repair service manual provides essential information for the maintenance and repair of your Z400 LT-Z400. It covers a wide range of topics, including detailed engine specifications, transmission operation, chassis and suspension adjustments, and electrical system components. The manual outlines recommended service intervals for engine oil changes and valve clearance checks, along with fluid capacities and recommended fluid types, ensuring your ATV remains in optimal condition. This guide is an invaluable resource for owners and technicians seeking to perform routine maintenance, diagnose issues, and carry out repairs effectively, promoting longevity and peak performance of the vehicle.