1986–1991 Kawasaki Jet Ski X-2 (JF650) Service Manual (PN 99924-1069-06)

• Document identity: A 212-page PDF scan of the Kawasaki Heavy Industries Jet Ski Watercraft Service Manual, Part No. 99924-1069-06, 6th Edition (1), dated Sep. 3, 1990. Its Quick Reference Guide contains 15 core chapters and five model-year supplements.
• Exact model coverage: The base manual covers the 1986 JF650-A1, followed by factory supplements for the 1987 JF650-A2, 1988 JF650-A3, 1989 JF650-A4, 1990 JF650-A5, and 1991 JF650-A6. A back-cover model-application chart gives the beginning hull number for each model year.
• Engine teardown and measurement work: Covers engine removal and installation, engine-bed fit and shimming, cylinder and piston service, compression testing, piston-to-cylinder and ring inspection, crankcase splitting, crankshaft runout, connecting-rod checks, magneto flywheel service, and coupling inspection.
• Fuel, oil-injection, and exhaust repair: Details the Keihin CDK34 used on A1–A5 models and the Keihin CDK38-32 fitted to the 1991 A6, along with fuel-pump, throttle, choke, reed-valve, fuel-tank, vent, and fuel-tap work; high-altitude carburetor adjustment; oil-pump bleeding and output testing; and exhaust-pipe, manifold, and water-box muffler service.
• Jet drive and steering repair: Includes drive-shaft and holder disassembly, coupling and damper inspection, bearing and seal replacement, jet-pump removal and overhaul, impeller inspection and clearance measurement, steering and trim cable adjustment, handlebar service, steering-shaft work, and trim-adjuster repair.
• Cooling, bilge, hull, and storage procedures: Covers hose routing, cooling and bilge flushing, breather and filter service, deck frames, hull replacement, engine-hood and rubber parts, storage preparation, recommissioning, test-running checks, and transport.
• Electrical diagnosis and factory reference data: Provides wiring diagrams, cable and wire-routing views, starter and charging-system tests, CDI and ignition checks, relay and switch inspection, battery charging charts, troubleshooting trees, torque tables, service limits, adjustment data, and illustrated special-tool references.

Model-Year Differences Are Built Into the Manual

This is not a generic 650 manual with a broad date range added to the title. Each supplement identifies the procedures and parts that differ from the earlier text. The 1987 A2 section adds the sediment bowl, revised electrical cases and wiring, trim-adjuster changes, and a storage drain procedure for the added bowl. The 1989 A4 supplement documents the cylinder-head flushing connection and the RPM-limiter ignition circuit, while the 1990 A5 section records its new-type flame arrester and revised carburetor specification.

The 1988 A3 supplement marks fuel-system revisions beginning at engine numbers JF650AE029887 and JF650AE029996, then identifies the late crankshaft center-main-bearing position ring beginning at JF650AE031798. The 37-page 1991 A6 supplement is the largest update. It covers the CDK38-32 carburetor and fuel-pump assembly, revised cable and wire routing, the intake-side oil-injection nozzle, one-piece exhaust tubes, enlarged bilge hose and filter, changed steering ball-joint position, revised wiring, and the electric case that houses the starter relay and regulator/rectifier.

Factory Repair Depth

The engine chapters carry repair work from removal through internal inspection and reassembly, with the related wear limits, clearances, torque specifications, and measurement methods. Representative illustrated tools include the Compression Gauge 57001-221, Piston Pin Puller Assembly 57001-910, Flywheel Holder 57001-306, Impeller Wrench 57001-1228, and Hand Tester 57001-983.

Useful named references include the Fuel System Diagram, Cable Routing and Wire Routing views, the Electrical System Wiring Diagram, the battery charging-rate chart, and Appendix fault-isolation charts for starting trouble, misfire, low power, poor steering control, overheating, and heavy fuel consumption.

The carburetor sections flag the engine-damage risk of an overly lean high-speed setting. The 1987 electrical supplement warns that the wrong silicone sealant can corrode lead connectors, while the steering chapter cautions that laying the craft on its right side can allow exhaust water to drain back into the engine.

This publication is a service manual, not an owner’s operating guide or parts catalog. It includes exploded component views and selected special-tool numbers, but parts-ordering information remains in the separate Kawasaki Parts Catalog. Model-year supplements must be used with the applicable base chapters rather than as stand-alone repair instructions.

Fuel-system, electrical, engine, and rotating jet-pump repairs can cause equipment damage or personal injury when procedures are misapplied. Follow the correct A1–A6 section, observe the manual’s cooling-water sequence and battery-disconnection warnings, and use a qualified marine technician for work beyond your training or equipment.