1999 Polaris SLH, SLTH, SLX, SLTX, Pro 785 Personal Watercraft Service Manual (P/N 9915085)

• Covers 1999 Polaris SLH, SLTH, SLX, SLTX, and Pro 785 personal watercraft, including both 2-passenger and 3-passenger chassis configurations. A 347-page PDF of the factory service manual, P/N 9915085, dated February 1999.
• Engine removal and rebuilding procedures cover domestic and Fuji engines, with cylinder and piston inspection, crankcase assembly, crankshaft bearing checks, and indexing procedures.
• Carburetor repair covers Keihin CDK II on domestic engines and Mikuni Super BN on the Pro 785, with disassembly, reassembly, synchronization, and needle-and-seat pop-off testing.
• Jet pump overhaul extends to the impeller, stub shaft, bearings, and seals, with engine-to-pump and pump-to-hull alignment procedures and ventilation/cavitation diagnostics.
• Electrical fault tracing covers starter-motor repair, charging-system tests, PVL ignition, and Hall-effect sensors, supported by model-specific wiring diagrams.
• Steering post removal, cable replacement, and nozzle centering accompany material-specific SMC, RTM, and FRC hull/deck repair coverage.

Engine and Model Configurations

SLH and SLTH use the 701cc Polaris Marine 700 twin; SLX and SLTX use the 1051cc Marine 1050 triple. The Pro 785 has the Fuji 785 three-cylinder engine, listed at 779cc in the specifications. These are carbureted, oil-injected two-strokes.

The two-passenger models are SLH, SLX, and Pro 785; SLTH and SLTX use the three-passenger chassis. Separate fuel, oil, and intake exploded views identify the different assembly layouts.

Seasonal Maintenance and Hydrolock Checks

The manual documents periodic maintenance schedules, cooling system flushing, and fuel system storage. Engine fogging and corrosion protection address saltwater use and off-season storage. Submerged-engine procedures and hydrolock troubleshooting cover checks for damage beyond the initial water intrusion.

Fuel-system diagnosis includes fuel-line air-leak testing, tank vent and pressure-relief valve checks, water-separator inspection, and accelerator-pump testing where fitted. Cooling-system coverage addresses exhaust cooling orifices, screens, and the thermostat/pop-off valve assembly.

Engine Repair and Oil Injection

Cylinder reconditioning sections distinguish domestic-engine honing and Marine 1050 exhaust-port chamfering from the Pro 785’s Ni-Ca-Sil cylinder honing. Pro-specific procedures cover exhaust-valve cleaning, cable adjustment, and actuator electrical testing.

Oil-injection coverage separates the cable-adjusted domestic system from the Pro 785’s fixed-length control rod. The Fuji section details pump bleeding and drive-gear bushing end-play shimming.

The domestic crankcase assembly cautions explain how sealant curing before correct clamping can alter main-bearing fit and cause premature engine wear.

Driveline Fit and Onboard Systems

Separate driveline views cover solid and bonded-rubber couplers. The modular pump service section identifies components accessible without removing the housing sealed to the hull. It also distinguishes pump bearing-and-seal service from the driveshaft bearing housing at the through-hull fitting, which is replaced as an assembly rather than rebuilt.

Pump-mounting cautions show how incorrectly seated studs can damage the housing or hull and upset driveshaft alignment.

Beyond ignition, the electrical chapter covers Multi-Function Display troubleshooting, fuel and oil level senders, temperature-warning circuits, Quick Trim motor checks, and electric bilge-pump diagnosis. Domestic-engine timing procedures include static and running checks; Fuji timing adjustment is covered separately.

Torque Tables, Service Limits, and Special Tools

Specifications detail engine compression ranges, idle speed adjustments, and jet pump clearances to assist in component assessment. Standard torque values for stainless steel fasteners, oil reservoir capacities, and ignition timing charts for the Fuji and domestic engines accompany piston/ring wear limits and electrical test specifications. High-elevation tables relate carburetor settings to impeller applications.

Tool references include pump alignment tool P/N 2871343 and impeller removal tool P/N 2871036. Carburetor synchronization references manometer P/N 2870672; Hall-effect and static timing checks identify tool P/N 2871745.

Diagrams and Diagnostic References

The Fuel Delivery Effect Diagram and Cooling System Flow Chart—Pro 785 explain fuel-metering overlap and cooling-line routing. The Cutaway View of Pump Assembly Sealing Points and Electric Starter System Testing flowchart support leak and no-crank diagnosis.

Wiring coverage includes the 1999 SLH/SLTH Wiring Diagram and 1999 Pro 785 Wiring Diagram, plus individual SLX and SLTX schematics. Added annotations on the SLX/SLTX pages reference PWC-00-05 for an engine no-restart condition.

Note: This page is a contents overview for the manual. It does not provide repair or diagnostic instructions. The manual’s safety precautions address fuel vapors, electrical isolation, and rotating driveline components.