1999–2003 Yamaha LST1200/LS2000/LX210/AR210 Jet Boat Service Manual (P/N LIT-18616-SB-01)

Yamaha publication LIT-18616-SB-01 combines the LST1200X base service manual with factory supplements for the 1999–2003 LST1200/LS2000, LX210, and AR210 jet boats. Coverage includes the twin 66H two-stroke engine installation and its jet pump units.

Text search, bookmarks and diagram detail: The base manual is not text-searchable. The supplements have searchable text, although many diagram labels are outside the text layer. Bookmarks cover the base manual and supplements. Small wiring labels require zooming; some of the smallest switch-table labels in the base manual remain difficult to read.

• Engine repair: Power unit removal, crankcase disassembly, cylinder and piston inspection, reed valve service, and intermediate shaft seal installation.

• Fuel and oil injection: Triple Mikuni BN 44 carburetor disassembly and synchronization, fuel pump inspection, oil pump cable adjustment, and system bleeding.

• Jet pump service: Impeller and drive shaft disassembly, bearing replacement, reverse gate service, and clean-out cap and hatch switch checks.

• Electrical diagnosis: Ignition, starting and charging tests, CDI unit checks, starter motor repair, and fuel-level and warning-system testing.

• Hull and deck: Steering and remote control service, helm pod disassembly, bimini top removal, extended swim step service, and wakeboard tower disassembly.

• Diagrams and specifications: Wiring diagrams, cooling water flow diagram, trouble analysis charts, maintenance interval charts, exploded views, and component-specific service specifications.

Written primarily for Yamaha dealers and trained mechanics, this manual assumes an understanding of mechanical service and repair procedures.

Model Supplements and Service Changes

The supplements are intended for use with the included base manual. They document changes to fuel and oil systems, clean-out cap hardware, warning indicators, and electrical equipment.

Separate LS2000/LX210 and AR210 meter panel back views show the AR210's paddlewheel sender connections. These layouts help match the wiring diagram to the installed speedometer before tracing an electrical fault.

Power Unit, Carburetors and Jet Pumps

Internal engine repair coverage includes cylinder-head water-jacket inspection, piston and ring measurements, crankshaft checks, and engine coupling alignment. Reference tables provide piston clearances, crankshaft deflection limits, spark plug gaps, and staged tightening torques.

Carburetor procedures cover diaphragm and needle-valve inspection, float arm height checks, and throttle and choke synchronization. Identification marks distinguish the 66H01/02/03 and 66H21/12/13 carburetor configurations. The service notes warn that cleaning jets with steel wire can enlarge their openings and affect performance.

Jet pump procedures include bearing and oil seal installation and impeller clearance inspection. Tool references identify the YB-06049 drive shaft holder and YB-06096 slide hammer set for this work.

Electrical Diagnosis and Cooling Circuits

The electrical sections include switch continuity tests, coil resistance checks, thermoswitch limits, battery specifications, and a Peak Voltage Measurement Chart. Equipment references include peak-voltage adapter YU-39991 and test harnesses YW-06777 and YW-06778.

More detailed peak-voltage testing is referred to the separate Jet Boat Peak Voltage Measurement Guide, LIT-18507-00-99, which is not included.

Full-boat wiring sheets are included in the base manual and the Y and B supplements. The Z and A/A-A sections contain subsystem diagrams but no separate full-boat wiring sheet.

The Cooling Water Flow Diagram traces the cylinder-head, exhaust-joint, muffler and water-lock circuits. Related sections cover cooling hose removal and installation.

Hull Service and Repair Limits

Hull and deck procedures cover the bilge pump, ventilation blower, through-hull fittings, and control cables. The wakeboard tower disassembly notes identify unsupported aluminum tubing as a damage risk.

FRP and gelcoat maintenance are covered. Hull repair is referred to the separate Basic Hull Repair Video and Workbook, VID-10660-00-43, which is not included.

Working on marine fuel systems and high-voltage ignition components involves inherent fire and electrical hazards.

Combined PDF and Included Supplements

One printable English PDF contains the LST1200X base manual (LIT-18616-02-06), 158 pages; LST1200Y supplement (LIT-18616-02-23), 47 pages; LST1200Z supplement (LIT-18616-02-29), 29 pages; LST1200A/A-A supplement (LIT-18616-02-41), 20 pages; and LST1200-B supplement (LIT-18616-03-41), 22 pages.