Kawasaki Jet Ski X-2 (JF650) Service Manual, 1986–1991 (P/N 99924-1069-06)

Kawasaki Heavy Industries’ Jet Ski Watercraft Service Manual (P/N 99924-1069-06) covers the 1986–1991 Jet Ski X-2. The 6th Edition (1), dated September 3, 1990, contains 15 base chapters for the JF650-A1 and five factory supplements for the JF650-A2 through JF650-A6.

Finding Procedures in the PDF

Text search and diagram detail: The printed Quick Reference Guide and chapter contents help locate procedures. PDF text search and embedded bookmarks are unavailable. The smallest wire codes are easiest to read when zoomed in.

The ZIP contains one printable English-language PDF with 212 pages, including the original covers, front matter, appendix, and five model-year supplements. The page count includes three blank pages.

Engine, Jet Pump, and Electrical Service

These are selected workshop topics. The manual also includes a periodic maintenance chart and a schedule for lubrication and corrosion protection.

• Engine removal and overhaul: Engine-bed fit and shimming, cylinder compression testing, piston and ring inspection, crankcase splitting, connecting-rod checks, crankshaft measurement, and magneto flywheel service.
• Fuel, oil injection, and exhaust: Carburetor service and high-altitude adjustment, fuel pump and reed valve inspection, oil pump bleeding and output testing, and exhaust manifold and water box muffler service.
• Drive shaft and jet pump: Drive shaft and holder disassembly, coupling and damper inspection, pump removal and overhaul, bearing and seal replacement, and impeller clearance checks.
• Steering and trim: Steering and trim cable adjustments, handlebar and steering shaft service, and trim adjuster removal and installation.
• Cooling, bilge, hull, and storage: Cooling and bilge flushing, hose routing, breather and filter service, deck frame and hull replacement, engine hood seals, storage, recommissioning, test running, and transport.
• Electrical diagnosis: Starter motor overhaul and voltage-drop testing, starter relay and switch inspection, charging coil and regulator/rectifier tests, and CDI ignition checks with wiring diagrams and wire color codes.

Kawasaki wrote the manual primarily for trained mechanics in equipped shops and also provides guidance for owners with basic mechanical skills who perform routine maintenance and basic repairs.

Model-Year Changes and Parts Identification

Use the supplement for your model together with the applicable earlier chapters. The back-cover model application chart lists beginning hull numbers, and the JF650-A3 engine serial breaks help identify the correct fuel-system hardware and crankshaft center main bearing design before ordering parts.

JF650-A2 and A3: The 1987 supplement covers the sediment bowl and its storage drain, revised electrical cases and wiring, and trim adjuster changes. The 1988 supplement identifies changes to the fuel-system fastener, mixture-screw assembly, and crankshaft positioning ring.

JF650-A4 and A5: The 1989 supplement covers the cylinder-head flushing connection and the CDI ignition circuit with an RPM limiter. The 1990 supplement identifies the revised flame arrester and carburetor settings.

JF650-A6: The 37-page 1991 supplement covers the revised carburetor with integrated fuel pump, cable and wire routing, the oil injection nozzle on the intake manifold, and one-piece exhaust tubes. It also shows the larger bilge hose and filter, relocated steering cable ball joint, and electric case that houses the starter relay and regulator/rectifier.

Overhaul Measurements and Fault Isolation

The engine chapters pair disassembly and reassembly with wear limits, clearances, and torque specifications. Illustrated tools include the Compression Gauge 57001-221, Piston Pin Puller Assembly 57001-910, and Flywheel Holder 57001-306. The pump and electrical chapters show the Impeller Wrench 57001-1228 and Hand Tester 57001-983.

Use the fuel system diagram, cable and wire routing views, electrical wiring diagrams, and battery charging chart alongside the appendix troubleshooting charts. For example, the starting chart separates fuel delivery and compression faults from ignition and starter circuit problems. Other charts cover misfire, low power, poor steering, overheating, and heavy fuel consumption.

The carburetor chapter warns that an overly lean high-speed setting can damage the engine. The 1987 electrical supplement specifies the sealant type for the electrical cases to prevent connector corrosion. The steering chapter warns that laying the craft on its right side can let exhaust water drain into the engine.

The manual includes exploded component views for service work. Kawasaki provides operating instructions in its separate Owner’s Manual and lists replacement parts in its Parts Catalog.

Follow the model-specific cooling-water and battery-disconnection precautions when servicing the engine, fuel system, electrical system, or jet pump. Use a qualified marine technician for work beyond your training or equipment.

Crankshaft and Impeller Wear Limits at a Glance

For the JF650-A1, the crankshaft inspection gives a standard of under 0.04 mm total indicator reading (TIR) and a service limit of 0.10 mm TIR at either measuring point.

The JF650-A1 pump chapter gives a standard impeller blade tip-to-case clearance of 0.2–0.3 mm and a service limit of 0.6 mm. The inspection relates excess clearance to wear or damage in the impeller or pump case.