Kawasaki Ultra 250X 2007–2008 Service & Repair Manual (P/N 99924-1377-01)

Kawasaki Heavy Industries, Ltd. factory service manual for the 2007 JET SKI Ultra 250X JT1500B7F with the supercharged engine. P/N 99924-1377-01, First Edition (1), dated December 15, 2006. Match the complete model code and beginning hull numbers listed above when checking fit; the download contains the original publication without a 2008 supplement.

PDF Search, Bookmarks, and Diagram Detail

Search and wiring detail: Service text is searchable, and embedded bookmarks provide access to chapters, procedures, and tables. Labels within image-based diagrams are not searchable. Small wiring labels and connector pin numbers require zooming.

ZIP download containing one printable, 477-page PDF: 10 front-matter pages, 466 pages across the service chapters and appendix, and one model-application/back-cover page. The total includes 11 blank pages.

DFI Diagnosis, Supercharger Service, and Watercraft Repair

These selected coverage highlights outline the main workshop areas. Other included topics range from fuel-tank cleaning to adhesive selection for rubber parts.

• DFI diagnosis: User/dealer self-diagnosis, service-code and fail-safe tables, ECU checks, sensor-circuit testing, injector diagnosis, and fuel-pressure and flow tests.

• Supercharger and cooling: Drive-belt inspection and adjustment, gear-oil checks, supercharger disassembly and assembly, intercooler service, and relief- and blow-off-valve testing.

• Engine repair: Removal and installation, camshaft-chain timing, cylinder-head and valve work, shim selection, piston inspection, crankcase splitting, and crankshaft and connecting-rod service.

• Drive and jet pump: Drive-shaft and holder service, pump overhaul, shaft and bearing replacement, impeller inspection, and pump-case wear assessment.

• Steering and hull: Cable and reverse-system adjustment, adjustable steering-holder service, hull fittings, and hull replacement.

• Electrical troubleshooting: JT1500B7F wiring diagrams, starter-motor overhaul, charging and ignition tests, Kawasaki Smart Steering checks, multifunction-meter diagnosis, and immobilizer key registration.

• Maintenance and storage: Scheduled inspections, oil and filter service, cooling and bilge flushing, lubrication, storage preparation, and return-to-service checks.

Written primarily for trained mechanics in a properly equipped shop, the manual also supports owners performing basic maintenance and repair who understand mechanical principles, tools, and workshop procedures. Work beyond the owner's experience requires a qualified mechanic.

DFI Fault Isolation and KDS Requirements

The meter's dealer mode displays current faults; retrieving and erasing past service codes requires Kawasaki Diagnostic System equipment. Circuit tests connect ECU power and ground checks with pressure, temperature, throttle-position, and rotation sensors, ignition coils, injectors, relays, the fuel pump, and the idle-speed controller.

The Windows-based KDS 2.4 setup specifies software CD-ROM 57001-1503, signal converter 57001-1504, communication cable and adapter 57001-1470, and KDS adapter cable 57001-1696.

Other procedure-specific tools include belt measuring gauge 57001-1697, shaft wrench 57001-1551, impeller holder 57001-1695, impeller wrench 57001-1228, and key registration unit 57001-1582. Software, interface hardware, physical tools, and the separate parts catalog are not included.

Supercharger, Intercooler, and Submersion Recovery

Supercharger disassembly covers the pulley, bearing, and intake pipes, with rotor cleaning and inspection; replacement of the supercharger assembly is specified when necessary. Pulley-bearing checks address water and salt-water intrusion.

The charging-temperature fault tables link intercooler, cooling-passage, and air-bypass checks. This gives the technician a way to investigate intake-air overheating across the related systems rather than treating the temperature sensor as the only possible cause.

Recovery procedures address water in the engine, supercharger, and fuel system. Kawasaki warns that laying the craft on its right side can feed exhaust water into the engine, while delayed recovery can destroy crankshaft bearings and damage other internal parts.

Engine, Lubrication, and Exhaust Work

Step-by-step procedures cover compression testing, TDC location, camshaft installation, valve-guide replacement, valve-seat repair, and piston and ring inspection. Bottom-end material adds bearing-selection tables, clearance checks, and connecting-rod inspection.

A slack cam chain can kink on the crankshaft sprocket during camshaft work, damaging both components. Stacked shim stock or ground valve shims can escape or fracture at high rpm and cause extensive engine damage.

Oil-cooler, oil-separator, oil-pump, and pressure-relief-valve service is supported by oil-pressure measurement procedures. Exhaust work includes the manifold, muffler body, and water-box mufflers.

Drive Alignment and Electrical References

Drive-shaft holder assembly includes seal installation and coupling-alignment requirements. Pump procedures continue through internal bearing and shaft work, while steering instructions cover the adjustable holder, reverse bucket, and shift linkage.

Immobilizer coverage distinguishes FPO and SLO keys, spare-key registration, and ECU replacement. Loss of all registered keys requires ECU replacement before new keys can be registered.

Reference drawings include the Fuel System Diagram, DFI System Wiring Diagram, Engine Oil Flow Chart, Cooling and Bilge System Flow Diagram, and All Keys Initial Registration Flow Chart. Exploded views identify torque, lubrication, sealant, and locking-agent requirements; the appendix provides cable, wire, and hose routing drawings.

The final symptom-based troubleshooting guide addresses common faults rather than every possible cause.

High-pressure fuel, rotating supercharger and pump parts, sealed-battery work, and submerged-engine recovery are not beginner repair jobs. Follow Kawasaki's warnings and use a qualified marine technician when the work exceeds your tools or experience.

A Preview of Valve and Impeller Clearances

Cold-engine valve-clearance specifications are 0.15–0.24 mm for the inlet valves and 0.32–0.41 mm for the exhaust valves. Separate shim-selection charts support the adjustment procedures.

For the jet pump, standard impeller-to-case clearance is 0.15–0.3 mm, with a 0.6 mm service limit. The inspection section connects excessive clearance with poor performance even when the impeller and pump case show no obvious damage.