2003-2008 Suzuki LT-Z400 Quadsport 400, LT-Z400K3 series Factory Service Manual (P/N C4085-91017)

• Original OEM publication C4085-91017, documenting the LT-Z400K3 series and subsequent carryover models
• 302-page factory reference detailing engine, chassis, electrical, and drivetrain specifications
• Features 32 dedicated torque-value tables for major assembly bolts
• Includes 5 electrical wiring diagrams and 8 exploded-view schematics for the liquid-cooled DOHC single-cylinder engine

Engine and Maintenance Overview

This factory documentation provides exhaustive details for maintaining and evaluating the Quadsport 400 powertrain and chassis. Chapters systematically categorize procedures ranging from initial engine removal to complete internal inspections. It covers the cylinder head, piston assembly, and transmission in high detail. You will find dedicated maintenance sections outlining exact service intervals for cooling systems, drive chain adjustments, and brake fluid cycles. Note that working on high-performance ATVs carries inherent risks; always verify proper lifting points and depressurize fluid lines before beginning teardowns to ensure shop safety.

Technical Data and Specifications

Precise engine assembly data highlights the cylinder head bolt tightening sequence. Tolerance charts specify acceptable limits for valve stem deflection, cam height, and piston ring end gap. For instance, the reference tables detail the crankshaft-web-to-web width at exactly 62.0 +/- 0.1 mm. Oil pressure checks should reveal standard values above 20 kPa at normal operating temperature. Electrical references confirm the 12V 28.8Ah battery rating alongside 20A main fuse protection limits.