2003 Suzuki LTZ400 K3 Factory Service & Repair Manual (P/N 99500-20502)

• Covers 2003 Suzuki LT-Z400K3 all-terrain vehicle specifications, maintenance schedules, and engine overhaul procedures.
• Official OEM publication P/N 99500-20502.
• Contains 378 pages of technical data, exploded-view diagrams, torque specifications, and periodic maintenance charts.
• This 2003 first edition provides the primary factory data for the initial LT-Z400 series launch.

Engine and Maintenance Overview

The 2003 Suzuki LT-Z400K3 service manual provides deep technical insight into the liquid-cooled, DOHC four-stroke engine system. Rather than hunting through forums, technicians get exact factory baselines for periodic maintenance. Content covers valve clearance adjustments, oil change intervals, and spark plug inspection standards. The documentation maps out chassis-related tasks like brake fluid classification, drive chain protocols, and suspension component inspections. Exploded diagrams illustrate complex assembly and disassembly sequences for the crankcase, transmission gears, and clutch. These visuals highlight critical sealant application points and exact bolt torque values. Working on high-performance ATVs carries inherent physical risks, making strict adherence to OEM factory specifications crucial for safe operation and mechanical integrity. This documentation serves purely as a descriptive reference for professional repair preparation and specification verification.

Specification Highlights

The manual documents vital engine identification specs, listing a bore of 90.0 mm and a compression ratio of 11.3:1. Idle speed dictates 1500 ± 100 r/min. For valve timing precision, intake valve clearance is set at 0.10–0.20 mm, while exhaust clearance requires 0.20–0.30 mm. Crankcase bolt torque values are strictly documented at 11 N-m (8.0 lb-ft) across the specified assembly stages. Finally, the coolant system capacity is logged at 1.2 liters.