2000–2002 Yamaha F50A, FT50B, FT50C Outboard Motor Service and Repair Manual (P/N 62Y-28197-3A-11)

This Yamaha service manual covers the 2000–2002 F50A, FT50B, and FT50C outboard motors, including tiller-handle and remote-control configurations. Publication 62Y-28197-3A-11, first edition November 2000, cross-references regional model names, approved model codes, and starting serial numbers.

• Power unit: Removal and installation, timing belt replacement, cylinder-head repair, valve-clearance adjustment, piston inspection, and crankshaft bearing selection.

• Fuel system: Fuel-pump testing and overhaul, carburetor inspection, Prime Start checks, carburetor synchronization, and throttle-linkage and dashpot adjustments.

• Lower unit: Separate gearcase procedures, water-pump service, propeller-shaft and drive-shaft repair, shim selection, and forward/reverse gear backlash measurement.

• Bracket and tilt systems: Tiller controls, steering-arm service, power trim and tilt overhaul, hydraulic bleeding, and trim-sensor adjustment.

• Electrical diagnosis: Ignition, starting, charging, and warning-system tests, supported by wiring diagrams, connector illustrations, and component-location views.

• Periodic maintenance: Maintenance interval charts, thermostat testing, lubrication points, fluid-capacity specifications, and lower-unit leakage checks.

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

Power Unit Diagnosis and Internal Repair

Troubleshooting charts address no-crank and no-start conditions, unstable idle, poor acceleration, and warning-related engine-speed restriction. Compression and oil-pressure checks help narrow down the cause before power-unit disassembly.

Internal repair coverage extends to valve-guide replacement, valve-seat refacing, camshaft inspection, and piston and ring measurements. Bearing-selection charts relate crankshaft, cylinder-body, and connecting-rod markings to the appropriate bearing colors.

The timing-belt procedures identify alignment marks and tensioner settings. They also warn that counterclockwise rotation of the flywheel or sprockets can damage the valve system.

Carburetors, Prime Start, and Fuel Delivery

The Prime Start cold-starting mechanism and acceleration-pump operation are explained alongside fuel and blowby hose routing, cooling-water hose views, and fuel-line drawings. Fuel-pump checks distinguish diaphragm and valve faults from problems elsewhere in the fuel supply.

The four-carburetor linkage has dedicated throttle-link, pilot-screw, synchronization, and dashpot adjustments. The synchronization procedure identifies the USA/Canada carburetor synchronizer YU-08030 and worldwide vacuum gauge 90890-03159, making the required test equipment clear before the work begins.

Gearcase Repair and Variant-Specific Shimming

Separate F50/F50A and T50/FT50B, FT50C sections distinguish the shift-cam and shift-slider arrangements. Exploded views accompany bearing, seal, dog-clutch, and shaft service.

Shimming instructions are divided between USA/Canada and worldwide tooling, with calculation examples and backlash checks for replacement gears or lower cases. This separation helps technicians choose the procedure and measuring tools that match the gearcase being repaired.

The lower-unit leakage-test section warns that excessive test pressure can damage the oil seals.

Bracket, Steering, and Trim Hydraulics

Removal and installation procedures distinguish EHD/ED hydro-tilt units from EHT/ET power trim and tilt units. Bracket coverage also includes the FT50C tiller mechanism, steering arm, upper case, oil strainer, and relief valve.

Power trim and tilt overhaul covers the gear pump, shuttle and relief valves, trim cylinder, tilt cylinder, and motor. Hydraulic-system and trim/tilt-operation diagrams explain fluid movement, while separate bleeding procedures address installed and removed assemblies.

A raised outboard must be supported with the tilt stop lever during the specified bracket and tilt work; loss of hydraulic pressure can let it lower unexpectedly.

Ignition, Starting, and Charging Tests

The CDI control-circuit diagram connects ignition timing and protective engine-speed control with temperature and oil-pressure inputs. Component tests cover the ignition coils, charge coil, pulser coil, switches, and warning circuits.

Starting and charging sections include fuse and harness checks, starter-armature and brush inspection, and lighting-coil and Rectifier Regulator tests. Peak-voltage measurements specify adapter YU-39991 / 90890-03172.

Four color wiring diagrams distinguish hydro-tilt models, power-trim tiller models, instrument-compatible tiller configurations, and remote-control models.

Selected Engine Service and Charging-Test Values

Engine specifications list a cold intake-valve clearance of 0.20 ± 0.05 mm and an oil refill of 2.0 L (2.1 US qt) without filter replacement.

The cylinder-head section specifies two tightening stages for the oiled M9 bolts: 23 N·m and 47 N·m. Separate torque specifications apply to the M6 bolts.

For charging-system diagnosis, the lighting-coil table gives an unloaded peak output of 127 V at 3,500 r/min across the green leads, measured using the specified peak-voltage adapter.

Searchable Text and Color Wiring Sheets

Search, bookmarks, and diagram detail: The PDF supports text search across the technical chapters. Embedded bookmarks open the main sections and four color wiring sheets. Small wire-color codes and connector labels on the reviewed wiring sheets are readable when enlarged.

One printable English PDF contains 403 pages, including the front and back covers, 15 memo pages, two blank pages, four wiring-diagram legend pages, and four color wiring sheets.