Kawasaki JET SKI Ultra 250X / 260X / 260LX Workshop Guide (2007-2010) – 545 P. Manual | Factory Grade

Kawasaki JET SKI Ultra 250X / 260X / 260LX Service Manual

Master your watercraft's maintenance with the ultimate technical reference used by authorized dealership technicians. This comprehensive document provides the engineering precision required to keep your high-performance supercharged engine running at peak efficiency. Designed for both professional shops and dedicated owners, it bridges the gap between basic operation and complex mechanical overhaul.

Maintenance ROI & Efficiency

• Cost Mitigation: Eliminate expensive dealership labor fees by performing your own seasonal tune-ups and oil changes.
• Component Longevity: Follow factory-prescribed lubrication schedules to prevent premature wear on high-stress supercharger components.
• Accuracy Guarantee: Utilize exact torque values and clearance specifications to ensure every bolt and seal meets OEM integrity.

Asset Logistics

• Document Volume: 545 High-Resolution Pages
• Technical Identifier: 4th Edition (Nov. 26, 2009)
• Digital Architecture: Bookmarked PDF with Searchable Text

Heritage & Precision Compatibility

This manual is engineered specifically for the Kawasaki JET SKI Ultra series, covering a broad spectrum of production years and specific serial ranges. It supports the 250X, 260X, and 260LX variants from the initial 2007 release through the updated 2010 models. Compatibility is confirmed for Series JT1500B, JT1500E, and JT1500F, ensuring that whether you own a first-generation 250X or the luxurious 260LX, the data is specific to your hull and engine configuration.

Visual Standards & Schematics

• High-Definition Exploded Views: Detailed component breakdowns for every major system, from the supercharger assembly to the jet pump housing.
• Wiring Architecture: Full-color electrical diagrams allowing for precise circuit tracing and connector identification.
• Zoom Performance: Optimized for workshop tablets and monitors, ensuring technical text and fine line drawings remain sharp at 400% magnification.

Expert Diagnostic Logic

Troubleshoot like a factory technician using the integrated Kawasaki Diagnostic System (KDS) protocols. The guide provides systematic logic flows for resolving engine slow-down modes, cooling alerts, and DFI system faults. By identifying service codes directly through the multifunction meter or PC interface, you can isolate electronic sensor failures or mechanical bottlenecks without guesswork.

Engineering Benchmarks

Comprehensive Technical Content

• General Information: Model identification, conversion tables, and workshop safety.
• Periodic Maintenance: Detailed service charts and critical adjustment procedures.
• Fuel System (DFI): Supercharger overhaul, intercooler service, and fuel injector diagnostics.
• Engine Architecture: Detailed top and bottom end repair, including crankshaft and piston specs.
• Propulsion & Drive: Jet pump impeller clearance, drive shaft alignment, and seal replacement.
• Support Systems: Cooling, bilge, and electrical system troubleshooting for all 4-stroke variants.

FAQ

How do I ensure the supercharger system is performing at peak efficiency? Regularly inspect the supercharger belt tension and the air bypass valve operation. The factory-specified belt tension must be maintained between 500 and 960 N to prevent slippage or premature bearing wear. Maintaining this specific tension ensures that the engine reaches its maximum rated output of 250 PS or 260 PS (depending on your JT1500 variant) without losing boost pressure during high-RPM operation.

What are the critical engine lubrication specs for the Ultra 250X and 260X? For a standard oil change, you will need approximately 4.0 liters of high-quality 10W-40 oil (API SG, SH, SJ, SL, or SM with JASO MA/MA1/MA2 rating). Ensuring the oil pressure remains at approximately 461 kPa (67 psi) when measured at 3,000 RPM is vital for protecting the internal crank and piston assemblies of these high-performance 1,498 cm³ engines, especially during extended high-speed runs.

Is my specific hull covered in this technical guide? This archive provides detailed coverage for multiple series based on their beginning Hull Identification Numbers. It includes the 2007-2008 Ultra 250X (Series JT1500B with prefixes starting US-KAW30001 or US-KAW40001) as well as the 2009-2010 Ultra 260X and 260LX models (Series JT1500E/F with prefixes US-KAW10001 and US-KAW90001). Using model-specific data prevents compatibility errors when ordering parts or performing electronic diagnostics on the DFI system.

What is the correct spark plug configuration for the 4-stroke DFI engine? You must use NGK PMR9B spark plugs gapped precisely to 0.6–0.7 mm. Tighten each plug to 13 N·m (113 in-lb) to ensure a proper seal and heat transfer. Maintaining this exact gap is essential for reliable ignition under the high-compression environment (up to 188 psi) created by the supercharger, preventing misfires that can lead to carbon buildup or reduced throttle response.

Can I use this manual to troubleshoot jet pump cavitation or steering issues? Yes, the guide details precise tolerances for the pump and impeller assembly, such as maintaining the impeller-to-pump-case clearance to prevent thrust loss. Additionally, it provides diagnostic paths for the steering system and the Engine Slow Down Mode, which activates if the cooling water temperature sensors or oil pressure sensors detect values outside of safe operational limits. Having these benchmarks allows you to isolate mechanical wear from electronic sensor faults immediately.