2007–2009 Yamaha F15F/F20F Outboard Service Manual Set with F15C/F20B Service Guide (P/N 6AG281972100)

This 2007–2009 Yamaha F15/F20 Outboard Manual Set combines the F15F/F20F Service Manual, 3rd Edition (December 2008), with the F15C/F20B Service Guide, 1st Edition (June 2006). The separate front cover carries reference 6AG281972100.

• Power unit repair: Engine removal and installation, cylinder-head and cylinder-block overhaul, valve-clearance adjustment, timing-belt replacement, and crankshaft bearing selection.

• Fuel system: Fuel-pump pressure and vacuum tests, carburetor removal and reassembly, pilot-screw adjustment, and Prime Start testing.

• Lower unit: Water-pump replacement, propeller-shaft and drive-shaft service, gear-shim selection, and forward/reverse backlash measurement.

• Bracket and tilt systems: Separate manual-tilt and power-tilt assemblies, steering components, power-tilt motor and gear-pump repair, cylinder inspection, and bleeding.

• Electrical diagnosis: Ignition and charging tests, starter-motor overhaul, warning-circuit checks, wiring diagrams, and symptom-based troubleshooting tables.

• Cooling and lubrication: Thermostat testing, cooling-water passage inspection, oil-pump clearance checks, oil-strainer inspection, and scheduled fluid service.

Written primarily for Yamaha dealers and trained mechanics, the service manual assumes a working understanding of mechanical and electrical service.

Power Unit Overhaul and Timing-Belt Precautions

Internal engine coverage includes valve-guide replacement, valve-seat refacing, camshaft inspection, piston-ring checks, and crankpin and main-journal oil-clearance measurement. Bearing-selection tables connect the crankcase identification marks with the appropriate main bearings.

The timing-belt sections explain the risk of water-pump impeller damage from reverse flywheel rotation and piston-to-valve contact if the sprockets move with the belt removed.

Carburetor, Fuel Pump and Prime Start

Fuel-pump diagnosis uses the specified pressure/vacuum tester YB-35956-A. The carburetor procedures cover float height, needle valves, jets, throttle linkage, and pilot-screw adjustment.

Prime Start checks include electrical resistance and plunger movement. The troubleshooting tables connect enrichment-system faults with hard starting, unstable idle, and poor acceleration, helping distinguish those faults from basic idle adjustment.

Lower-Unit Shimming and Cooling-System Checks

Separate shim calculations are provided for the pinion, forward gear, and reverse gear. Together with the backlash checks, these references support shim selection when the lower case or internal components are replaced.

Exploded assembly views identify the dog clutch, propeller-shaft housing, drive-shaft housing, and water-pump components. Thermostat opening tests and cooling-water passage checks support investigation of overheating; lubrication coverage includes oil-pump inspection and oil-strainer checks.

Steering Brackets and Power-Tilt Repair

The bracket chapter distinguishes tiller-handle and remote-control arrangements, as well as manual-tilt and power-tilt assemblies. Upper-case service extends to the oil pan, exhaust guide, exhaust manifold, and steering arm.

Power-tilt diagnosis includes brush and armature checks, pump-valve inspection, tilt-cylinder service, bleeding, and relay/switch continuity tests. Fuel vapor, ignition sparks, a raised outboard, and retained tilt-system pressure require the precautions described in the manual.

Ignition, Charging and Wiring Diagnosis

Electrical testing covers the ignition coil, pulser coil, charge coil, CDI unit, thermoswitch, oil-pressure switch, and Rectifier Regulator. Peak-voltage checks identify the specified multimeter YU-34899-A and peak-volt adapter YU-39991 where applicable.

Model-specific wiring diagrams and harness-routing views distinguish the tiller-controlled F15MHF from the remote-controlled F20PRF. Fault tables link no-crank, no-start, performance, and power-tilt symptoms to the relevant tests.

F15C/F20B Design and Rigging Guide

The appended guide explains the automatic decompression device, Prime Start operation, two-piece upper case, and remote-control rigging. Its Fuel Flow Diagram, Oil Flow Diagram, Cooling-Water Flow Diagram, and power-tilt Fluid Circuit Diagram show the system paths and valve layout.

This guide supplies design explanations, rigging instructions, and selected service data for its own regional variants. The main service manual provides the detailed repair procedures for its listed F15F/F20F configurations.

A Preview of Valve, Oil and Fastener Specifications

These examples are a small selection of the F15F/F20F service data. Cold intake valve clearance is specified at 0.15–0.25 mm; engine-oil quantities are 1.6 L without oil-filter replacement and 1.8 L with replacement.

The torque reference lists 108 N·m for the flywheel magnet nut and 27 N·m in each of the two tightening stages for the M8 power-unit mounting bolts. The flywheel installation instructions specify engine oil on the nut threads and washer.

Searchable Text, Chapter Bookmarks and PDF Contents

Finding procedures and wiring detail: Embedded text supports searches across both publications, with bookmarks for the main chapters and guide sections. Small wire-color codes and connector numbers require zooming. The main “TABLE OF CONTENTS” bookmark opens the notice page.

Supplied in English as one printable, 334-page PDF for download:

The first entry contains the 288-page service manual, including six memo pages, plus one separate cover. The guide includes three preliminary pages, 40 numbered pages, one memo page, and one back cover; all are already included in the total.