Yamaha 1998 115W & 130W Outboard Service Manual (P/N LIT-18616-01-92)

This Yamaha factory service manual (P/N LIT-18616-01-92, February 1998 printing) covers the 115W, C115W, S115W, B115W, 130W, S130W, and L130W two-stroke outboards. The identification tables also list 100AETO and 140BET, with regional model names and starting serial numbers.

Chapter Bookmarks and Wiring Diagram Readability

Navigation and text search Bookmarks lead to all nine chapters and selected subsections. PDF text search is unavailable, and the main-index bookmark points to a separate file. Small wiring labels require zooming, and some wire-color codes on the first foldout remain hard to distinguish.

The download is one printable English PDF with 209 pages, including six front-matter pages with the front cover, 198 chapter pages, four oversized wiring diagrams, and one back cover.

V4 Powerhead Repair, Gearcase Setup, and Electrical Tests

This selection of procedures focuses on repair and diagnosis. The manual also shows grease-point locations and covers sacrificial anode inspection.

• Power unit repair Power unit removal and installation, cylinder, piston, and crankshaft disassembly, reed-valve inspection, thermostat testing, and flywheel magneto removal.
• Fuel and lubrication Carburetor overhaul and synchronization, fuel pump and filter inspection, and oil injection pump adjustment and bleeding.
• Lower unit Water pump impeller and bearing replacement, dog clutch and shift rod service, gear backlash measurement and shimming, and leakage testing.
• Power trim and tilt Unit removal, PTT motor disassembly, hydraulic pressure testing, fluid filling, and air bleeding.
• Bracket unit Bottom cowling and upper casing removal, clamp and swivel bracket disassembly, and steering bracket inspection.
• Electrical diagnosis Ignition, starting, charging, fuel enrichment, and PTT control circuits, with wiring diagrams, starter motor disassembly and inspection, and a symptom-based trouble analysis chart.

Yamaha wrote these procedures for its dealers and their mechanics. The inspection and setup work uses workshop measuring equipment and Yamaha special tools.

Fuel, Oil Injection, and Timing

The manual distinguishes oil-injection models from the pre-mix 115BE, C115TR/115BET, and 140BET. Carburetor procedures cover float height, individual pilot screw settings, pickup timing, and idle speed. Factory ignition adjustments cover full advance and full retard.

The Fuel Line Layout and Oil Line Layout drawings show hose routing. The oil line drawing also identifies check-valve direction.

Power Unit Repair and Inspection

Cylinder bore wear limits, piston-to-cylinder clearance, bearing checks, and piston-ring sectional sketches help determine which parts can be reused during a powerhead rebuild. An uneven flywheel puller setup can damage the engine or puller. Incorrectly positioned seal-ring gaps can lead to breakage during crankcase installation.

Lower Unit Repair and Shimming

Separate exploded views show the standard regular-rotation, B115/115F, and counterrotation gearcases. Matching the view to the gearcase helps identify the correct bearing arrangement and shim procedure. The manual distinguishes U.S./Canadian tooling from other-market tools and covers counterrotation propeller-shaft free play. It lists backlash indicator YB-06265 / 90890-06706.

Trim, Tilt, and Bracket Service

Hydraulic repair covers the gear pump, shuttle and relief valves, tilt piston, trim pistons, and free piston. Upward-operation pressure limits differ for B115/115F units. The test section identifies hydraulic gauge 90890-06776. Bracket inspections also cover mounting rubbers and the cowling lock mechanism. The manual gives precautions for hydraulic pressure, supporting the raised outboard, and working around fuel vapors.

Electrical Tests and Trouble Analysis

Separate ignition wiring diagrams show oil-injection and pre-mix layouts. Test procedures cover CDI output, charge-coil and pulser-coil peak voltage, lighting-coil output, and the rectifier/regulator. The Power Trim and Tilt Control System diagram accompanies relay, trailer-switch, and trim-sensor tests. The electrical chapter also covers thermo switches, oil-level sensors, and the fuel enrichment valve.

The Trouble Analysis Chart links symptoms such as no-start, overheating, hard shifting, and poor tilt holding to components and the chapters that cover them.

Maintenance and Assembly References

The maintenance chart covers service intervals for fuel filters, spark plugs, and gear oil. Assembly references include component-specific and general tightening torques, fluid capacities, and dimensional drawings. The exploded views use part names, quantities, and job instructions. Use the OEM parts catalog for replacement part numbers.

Powerhead and Gearcase Specification Examples

For the covered 100, 115, 130, and 140 hp powerheads, Yamaha specifies a cylinder head warpage limit of 0.1 mm and a crankshaft runout limit of 0.05 mm. The lower-unit leakage check calls for the gearcase to hold 100 kPa for 10 seconds.