1991 Kawasaki JET SKI 650SX & X-2 Service & Repair Manual (P/N 99924-1069–01)

• Covers the 1991 Kawasaki JET SKI 650SX and X-2 models, specifically the JS650-B1 variant
• Original OEM publication P/N 99924-1069–01, providing targeted service and maintenance supplementation
• Contains 83 pages of technical specifications, exploded-view diagrams, and electrical system schematics
• Features a specialized periodic maintenance chart detailing 10-hour, 25-hour, and 100-hour service intervals
• Provides the specific configuration data required when servicing the JS650-B1 in conjunction with the base service manual
• Details component breakdowns for the engine bottom end, crankcase, magneto flywheel, stator, water box muffler, flame arrester, starter motor, and steering cable
• Outlines step-by-step procedures for crankcase splitting, engine removal, bilge system flushing, oil pump bleeding, starter relay testing, impeller clearance inspection, sediment bowl cleaning, and reed valve inspection

Service and Maintenance Documentation

When you are deep into a rebuild, having the exact factory specs makes all the difference. This PDF service manual supplement delivers structured technical information specifically for the 635 ml vertical twin engine, providing the critical data needed to perform a reliable repair. Utilizing these exact factory tolerances directly benefits the technician by preventing costly mistakes, such as misaligning the drive shaft or stripping delicate aluminum marine housings. It also empowers mechanics with detailed instructions for tasks that usually require an expensive dealership visit, including high-altitude carburetor tuning, complete starter motor rebuilds, and full steering cable replacements. Chapters detail the fuel system, covering Keihin CDK38-32 carburetor specifications and precise jet adjustments, alongside lubrication system parameters for the 2.8 L oil tank capacity. Mechanical components for the drive shaft, pump, and impeller are thoroughly documented with specific torque values and bearing service limits for restoring optimal jet thrust performance. Working on high-performance marine engines and fuel systems carries inherent physical risks, so always follow standard shop safety practices and verify your procedures against these factory specifications to ensure safe operation on the water.

Additional sections clarify the electrical system, replacing trial and error with accurate CDI igniter testing procedures and wiring diagrams specific to the JS650-B1 model year. To further assist the technician, the documentation includes clear cable routing diagrams, a fuel system diagram, float arm level drawings, drive shaft runout views, and a handy unit conversion table. The hull and engine hood sections are equally detailed, defining the exact rubber damper and gasket installation patterns required for long-term protection against water ingress during harsh operation.

Specification and Reference Data

Applying incorrect torque is a quick way to ruin a top end during any repair. This guide explicitly lists the correct torque requirements for all major fasteners. In the assembly sections, cylinder head nuts are documented at 29 N-m (22 ft-lb) and coupling bolts are set at 98 N-m (72 ft-lb). The tuning section specifies the spark plug gap at 0.7–0.8 mm. For driveline maintenance, the drive shaft runout standard is documented at less than 0.2 mm, with a strict 0.6 mm service limit. Engine bed mounting bolts require exactly 22 N-m (16.0 ft-lb) for proper securing to the hull. Along with crucial cooling system data, the guide provides all essential maintenance scheduling intervals to keep the watercraft running reliably.