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

• Designed for technicians, independent repair shops, and experienced watercraft owners servicing the 2007 Kawasaki JET SKI Ultra 250X JT1500B7F equipped with the supercharged four-stroke DOHC four-cylinder engine.
• Model application begins at hull numbers US-KAW30001□607 and US-KAW39001□607; □ represents the variable hull-number digit.
• Kawasaki Heavy Industries, Ltd. P/N 99924-1377-01, First Edition (1), dated December 15, 2006; 477 PDF pages.
• DFI diagnosis covers KDS 2.4 connection requirements, user/dealer self-diagnosis, service-code and fail-safe tables, ECU power and ground checks, sensor circuits, injectors, fuel-pump operation, and fuel pressure and flow testing.
• Supercharger service spans drive-belt condition and tension inspection, gear-oil checks, removal, disassembly and assembly, plus intercooler and air-bypass relief/blow-off valve inspection.
• Engine repair sections detail removal and installation, camshaft-chain timing, cylinder-head and valve work, valve-shim selection, piston and cylinder inspection, crankcase splitting, crankshaft and connecting-rod service, and lubrication-system pressure checks.
• Jet-pump, drive, steering, and hull procedures cover drive-shaft service, pump overhaul, impeller clearance inspection, reverse and cable adjustment, adjustable steering, hull fittings, and hull replacement.
• Electrical and reference material includes the JT1500B7F wiring diagram, starter/charging/ignition circuits, Kawasaki Smart Steering tests, multifunction-meter diagnosis, immobilizer key registration, exploded views, flow diagrams, hose routing, storage procedures, and symptom-based troubleshooting.

Exact Model and Publication Scope

This factory service manual is tied to one model application: the 2007 JT1500B7F Ultra 250X. The listed beginning HIN sequences matter because the Ultra 250X name alone does not establish coverage. This is not a 2008 supplement and does not provide blanket coverage for every JT1500 or JT1500B build.

The general specifications identify the covered craft as a 1,498 cc, water-cooled DOHC four-cylinder with fuel injection, semi-dry-sump lubrication, direct engine-to-jet-pump drive, and a supercharger/intercooler system. The manual moves from scheduled maintenance and adjustment into full shop repair, including torque and locking-agent tables, fluid and lubrication data, pressure-test specifications, electrical test values, clearances, wear limits, and component inspection criteria.

DFI, Supercharger, and KDS Work

For digital troubleshooting, the DFI chapter is built around fault isolation rather than a component overview. It explains the multifunction meter's user and dealer diagnostic modes, the displayed service-code characters, stored-code behavior, fail-safe actions, and a shop diagnosis sheet. Test coverage follows the ECU through the major pressure, temperature, position, and rotation sensors, then into the ignition coils, relays, injectors, fuel pump, throttle body, idle-speed controller, inlet manifold, fuel lines, and tank.

Kawasaki identifies the Windows-based KDS 2.4 components by part number: software CD-ROM 57001-1503, signal converter 57001-1504, communication cable and adapter 57001-1470, and KDS adapter cable 57001-1696. Other tool references include the belt measuring gauge 57001-1697, shaft wrench 57001-1551, impeller holder 57001-1695, impeller wrench 57001-1228, and key registration unit 57001-1582. These items are referenced for the repair procedures; the PDF does not include the software, interface hardware, physical tools, or separate parts catalog.

Supercharger coverage extends beyond routine belt inspection. The manual addresses pulley and bearing condition, salt-water intrusion checks, gear-oil service, removal, disassembly and assembly, intercooler work, and relief- and blow-off-valve testing. That material is integrated with DFI charging-temperature diagnosis and the cooling/bilge chapter, which is useful when tracking charging-air temperature, overheat, or post-submersion problems.

Mechanical, Pump, and Electrical Repair Depth

Engine chapters cover top- and bottom-end repair from compression testing and TDC location through camshaft and chain installation, cylinder-head removal, valve-guide and valve-seat repair, and piston and ring inspection. Bottom-end procedures continue with crankcase assembly, bearing selection, and connecting-rod checks. Separate sections handle the oil cooler, oil separator, oil pump, pressure-relief valve, oil-pressure measurement, exhaust manifold, muffler body, water-box muffler, and complete engine removal and installation.

The drive and pump chapters document drive-shaft holder service, jet-pump removal, internal disassembly and reassembly, shaft and bearing work, impeller inspection, and pump-case clearance evaluation. Steering coverage includes the cable, handlebar and adjustable holder, reverse bucket, shift system, and Kawasaki Smart Steering sensor checks. Electrical repair continues through the battery, starter motor, charging and ignition systems, multifunction meter, immobilizer, relays, switches, and fuses.

Among the most useful visual references are the Fuel System Diagram, DFI System Wiring Diagram, Engine Oil Flow Chart, Cooling and Bilge System Flow Diagram, JT1500B7F Wiring Diagram, and the All Keys Initial Registration Flow Chart. Chapter-opening exploded views identify torque, lubrication, sealant, and locking-agent requirements, while the appendix supplies cable, wire, and hose routing drawings. Its final troubleshooting guide is a common-fault aid rather than an exhaustive list of every possible cause.

The manual warns that a slack cam chain can kink on the lower sprocket when the crankshaft is turned with the camshafts removed, damaging the chain and sprocket. It also prohibits stacked shim stock or ground valve shims because either can escape or fracture at high rpm and cause extensive engine damage. On a swamped craft, water may reach both the engine and supercharger; laying the hull on its right side or delaying recovery can feed exhaust water back into the engine and ruin bearings and other internal parts.

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.