2011–2013 Kawasaki Jet Ski ULTRA 300X / 300LX Service Manual

This Kawasaki service manual covers the 2011–2013 ULTRA 300X and ULTRA 300LX Jet Ski models in the JT1500H/J series, including JT1500HBF and JT1500JBF, with the 1498 cc supercharged four-stroke engine. The publication carries a 2012 Kawasaki copyright and has 16 chapters.

Text search and diagram navigation: Service text is searchable, with embedded bookmarks for chapters and individual procedures. Some diagram labels are not searchable. Small wiring labels require zooming.

• Engine repair: Engine removal and installation, cylinder-head and crankcase disassembly, valve-seat repair, camshaft timing, and bearing inspection.

• DFI and ETV diagnostics: Self-diagnosis flowcharts, service-code tables, APS/TPS testing, injector checks, and fuel-pressure and flow-rate tests.

• Supercharger service: Eaton TVS removal and installation, rotor cleaning, drive-belt replacement, tensioner inspection, and air-bypass valve tests.

• Cooling and exhaust: Intercooler service, oil-cooler maintenance, cooling and bilge flushing, exhaust inspections, and submerged-engine recovery.

• Jet pump and steering: Pump rebuilds, impeller clearance checks, drive-shaft alignment, and steering, reverse-bucket, and trim-cable adjustments.

• Electrical systems: Wiring diagrams, ignition and charging tests, starter repair, Kawasaki Smart Steering checks, electric trim diagnosis, and immobilizer key registration.

Written primarily for trained mechanics in a properly equipped shop, this manual also supports owners doing basic maintenance and repair who understand mechanical fundamentals, tool use, and workshop procedures.

Engine Repair and Lubrication

Top-end coverage includes valve-guide replacement, valve-seat cutting, piston and ring inspection, and compression diagnosis. Bottom-end procedures cover crankshaft and connecting-rod inspection, bearing-insert selection, and the factory’s bolt-stretch and angle-tightening methods.

Scheduled maintenance charts are backed by torque tables for engine, intake-manifold, and supercharger fasteners. Valve-clearance data, compression specifications, wear limits, and oil capacities provide service references. Exploded views identify assembly positions and lubrication points.

The Engine Oil Flow Chart traces the semi-dry-sump system. Related procedures cover oil-pressure testing, oil-pump service, and oil-cooler thermostat inspection.

The cam-chain section explains how incorrect handling of the non-return tensioner can damage both the tensioner and the chain.

DFI Diagnosis and Supercharger Service

Digital Fuel Injection (DFI) troubleshooting pairs diagnostic trouble codes with circuit checks and ECU backup behavior. Electronic Throttle Valve (ETV) coverage explains power-limitation, limp-home, and idle modes.

The DFI Diagnosis Flow Chart and ECU connector terminal views help separate sensor, wiring, and power-supply faults before components are replaced.

APS/TPS input and output tests and intake-air pressure sensor checks are documented. Stored fault history can be accessed and cleared with Kawasaki Diagnostic System (KDS 3) equipment. ECU identification distinguishes US/CA/AU units from EUR units.

The APS is factory-set, as are the TPS and ETV components in the throttle body. Disassembling or adjusting the throttle-body assembly can cause poor performance requiring its replacement.

Supercharger construction drawings explain the Eaton Twin Vortices Series (TVS) and its drive transmission. Pulley and intake-pipe removal and rotor-deposit cleaning are covered; internal supercharger and transmission disassembly are prohibited.

The automatic belt tensioner is described as maintenance-free, with condition checks and replacement procedures supplied.

Jet Pump, Cooling and Hull Service

Pump repair includes bearing and seal replacement and impeller/pump-case measurements. Impeller Wrench 57001-1228 and Impeller Holder 57001-1695 are specified. The clearance checks help investigate weak propulsion when the engine runs properly.

The Cooling and Bilge System Flow Diagram and hose-routing drawings show water flow and exhaust connections. Water-box muffler service and muffler-body filter inspection are covered, along with recovery procedures for water-contaminated fuel and oil.

Separate seat procedures address JT1500HBF and JT1500JBF configurations. Hull replacement and fitting locations are documented, along with winterization and return-to-service checks covering supercharger corrosion protection and jet-pump bearing care.

Electrical Testing and Immobilizer Service

The electrical section includes alternator and regulator/rectifier tests, digital-transistor ignition checks, ignition-timing specifications, and multifunction-meter testing. The Electric Trim Control System Circuit supports actuator, relay, and sensor diagnosis.

Immobilizer coverage distinguishes spare-key registration from ECU replacement. Key Registration Unit 57001-1582 and Key Registration Adapter 57001-1746 are identified.

Because dealing with high-pressure marine fuel lines and electrical systems carries inherent safety risks, always ensure you are qualified or consult a certified marine technician before performing mechanical work on this equipment.

Printable PDF and Included Pages

The ZIP contains one printable English file: a 559-page PDF, comprising 10 pages of front matter, 508 pages in Chapters 1–15, and a 41-page Appendix. Cover and blank pages are already included in the total; no separate supplements are supplied.