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

Service and Maintenance Documentation

When you are deep into a rebuild, having the exact factory specs makes all the difference. This service manual supplement delivers structured technical information specifically for the 635 ml vertical twin engine. 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, eliminating the guesswork with CDI igniter testing procedures and wiring diagrams specific to the JS650-B1 model year. 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

Guessing torque specs is a quick way to ruin a top end. 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.