Yamaha 115W, C115W, S115W, B115W, 130W, S130W, L130W Service Manual (P/N LIT-18616-01-92)

Yamaha factory service manual LIT-18616-01-92, February 1998 printing, covers the 115W, C115W, S115W, B115W, 130W, S130W, and L130W 2-stroke outboards. Its internal model tables also include 100AETO and 140BET, with worldwide, U.S., and Canadian designations and starting serial numbers.

This 209-page PDF is an English-language scan with no searchable page text.

• 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, oil injection pump adjustment, and air bleeding.

• Lower unit: Water pump impeller replacement, dog clutch and shift rod service, bearing replacement, gear backlash 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, enrichment, and PTT control circuits, with wiring diagrams, starter motor disassembly and inspection, and trouble analysis tables.

Yamaha specifies these procedures for its dealers and their mechanics, with workshop measuring equipment and special tools used throughout.

Fuel, Oil Injection, and Timing

Separate coverage addresses oil-injection engines and the pre-mix 115BE, C115TR/115BET, and 140BET configurations. Carburetor work includes float-height checks, independent pilot-screw settings, pickup timing, and idle-speed adjustment.

Factory ignition-timing adjustments cover full advance and full retard. Fuel Line Layout and Oil Line Layout drawings identify hose routing and check-valve direction.

Power Unit Repair and Inspection

The V4 power unit section details inspection parameters for reed valves, cylinder block wear limits, and piston-to-cylinder clearances. Cylinder head warpage, crankshaft runout, bearing checks, and piston-ring sectional sketches support internal repair planning.

Flywheel removal cautions address puller setup errors that can damage the engine or tools. Crankcase assembly notes explain how incorrectly positioned crank disk seal-ring gaps can cause ring breakage.

Lower Unit Repair and Shimming

Separate lower-unit exploded views cover regular rotation, B115/115F, and counterrotation assemblies. Matching these layouts to the engine configuration helps avoid using the wrong bearing arrangement or shim procedure during gearcase repair.

Shim-selection methods distinguish U.S./Canadian tooling from other-market tools and include counterrotation propeller-shaft free-play adjustment. References identify the YB-06265 / 90890-06706 backlash indicator.

Trim, Tilt, and Bracket Service

Internal hydraulic repair extends to the gear pump, shuttle and relief valves, tilt piston, trim pistons, and free piston. Pressure-test specifications distinguish the B115/115F upward-operation limits; the procedures identify hydraulic gauge 90890-06776.

Further inspection sections address mounting rubbers and the cowling lock mechanism. Follow the manual's precautions for fuel vapors, ventilation, hydraulic pressure, and supporting the raised outboard.

Electrical Tests and Trouble Analysis

Ignition System wiring diagrams distinguish oil-injection and pre-mix layouts. Diagnostic procedures cover CDI, charge-coil and pulser-coil peak voltage, lighting-coil output, and rectifier/regulator checks.

Further tests address thermo switches, oil-level sensors, and the fuel enrichment valve. The Power Trim and Tilt Control System diagram accompanies relay, trailer-switch, and trim-sensor tests.

The Trouble Analysis Chart links no-start, overheating, hard-shifting, and tilt-holding symptoms to components and chapter references for fault investigation.

Maintenance and Assembly References

Maintenance interval charts cover fuel filters, spark plugs, gear oil, and other scheduled service. Component-specific tightening torque tables cover engine and gearcase assembly, with general torque specifications, fluid-capacity data, and dimensional drawings.

Exploded views use part-name, quantity, and job-instruction tables; they do not replace an OEM replacement-parts catalog.

File Format and Readability

Page breakdown: Six pages of front matter, including the front cover; 198 chapter pages; four oversized wiring-diagram pages; and one back cover. All are included in the stated total.

Navigation: Bookmarks cover all nine chapters and selected subsections. The external "Return to main index" link points to a separate, unbundled file.

Wiring diagrams: Small labels require magnification. Scan quality varies; some dense labels on the first oversized diagram remain difficult to distinguish.