Yamaha F50A FT50B FT50C Outboard Service Manual 2000 – 62Y-28197-3A-11 PDF

Description

Yamaha F50A, FT50B, FT50C Outboard Service Manual — 62Y-28197-3A-11

This is the complete Yamaha F50A, FT50B, FT50C Service Manual, document number 62Y-28197-3A-11, first edition, published November 2000. Yamaha prepared this manual for its dealers and trained mechanics working on the 50-horsepower four-stroke outboard lineup. It covers the F50A, FT50B and FT50C models in USA, Canada and worldwide configurations, and it contains the full range of procedures, specifications and service data needed to maintain, diagnose and repair these outboards.

The manual opens with an overview of the newly designed four-carburetor setup, the microcomputer-controlled CDI ignition system and the upgraded lower unit gearing borrowed from the F100. From there it moves through every major system on the motor. Whether you are adjusting valve clearance, replacing a timing belt, synchronizing carburetors, shimming a lower unit or troubleshooting the power trim and tilt, the relevant procedure is here with the torque figures, service limits and special tool part numbers you need.

File Details

• Manual type: Service Manual
• Brand: Yamaha
• Models covered: F50A, FT50B, FT50C (plus F50, T50 variants)
• Language: English
• Page count: 403
• File format: PDF
• Document number: 62Y-28197-3A-11
• Edition: 1st Edition
• Date: November 2000

Chapters Covered

• General Information
• Specifications
• Periodic Checks and Adjustments
• Fuel System
• Power Unit
• Lower Unit
• Bracket Unit
• Electrical Systems

General Information

This chapter explains how the manual is organised, the symbols used for lubricants, sealants and tightening torques, and the safety procedures that apply when working on the outboard. It includes the model identification table with serial number ranges for every F50A, FT50B and FT50C variant, a features and benefits section covering the four-carburetor design, the CDI unit with microcomputer and the upgraded lower unit, plus technical tips on how the Prime Start system, acceleration pump and ignition timing control work. Propeller selection charts and predelivery checks round out the chapter.

Specifications

General specifications, maintenance specifications, power unit tolerances, lower unit clearances and electrical values are laid out in tabular form. You get dimensions, weight, maximum output, full throttle operating range, fuel and oil capacities, gear ratios, ignition timing, compression pressures, piston and cylinder wear limits, valve clearances, torque values and more. Tightening torques for standard and specified fasteners are also listed here.

Periodic Checks and Adjustments

The maintenance interval chart tells you what to check at break-in, 50 hours, 100 hours and 200 hours. Step-by-step procedures follow for checking the top cowling fit, fuel joints and hoses, fuel filter, engine oil, timing belt, valve clearance, spark plugs, thermostat, cooling water passage, throttle cable, gearshift operation, engine idle speed, ignition timing, power trim and tilt fluid level, gear oil, anodes and battery. Each procedure includes the relevant specifications and adjustment values.

Fuel System

Hose routing diagrams for the fuel and blowby circuits and the cooling water hose are provided first. The chapter then covers the fuel line components, fuel filter and fuel pump, including how to check pump pressure and vacuum, disassemble the pump, inspect the diaphragm and valves, and reassemble it. The carburetor unit section describes removal of the four-carburetor assembly, disassembly and cleaning of individual carburetors, float height measurement, Prime Start testing, throttle link rod adjustment, pilot screw adjustment, carburetor synchronization and dash-pot (acceleration pump) adjustment.

Power Unit

This is the largest chapter. It begins with troubleshooting flowcharts for common symptoms such as engine not cranking, engine not remaining on, unsteady idle, poor acceleration and overheat or oil pressure warnings. It then moves into compression and oil pressure testing, removal of the power unit, timing belt and sprocket service, cylinder head removal and inspection, valve spring and valve guide checking, valve seat refacing, rocker arm and camshaft inspection, oil pump checking, piston and cylinder measurement, piston ring inspection, connecting rod and crankshaft checking, main journal and crank pin oil clearance measurement, bearing selection, cylinder body assembly and power unit installation.

Lower Unit

The lower unit chapter is divided by model family. For the F50A and FT50B/FT50C variants it covers removal of the lower unit, water pump and propeller shaft housing service, drive shaft and lower case disassembly and assembly, shimming procedures for pinion, forward gear and reverse gear, and backlash measurement. Exploded diagrams show every component in order, and the shimming sections give the calculation formulas and available shim thicknesses.

Bracket Unit

This chapter covers the tiller handle for the F50A, FT50B and FT50C, the bottom cowling, upper case, oil pan, clamp brackets, swivel bracket and steering arm, and the full power trim and tilt unit. You get disassembly and assembly procedures for the tilt cylinder, trim cylinder and gear pump, valve and filter inspection, motor service, and the electrical checks for the power trim and tilt relay, switches and trim sensor.

Electrical Systems

Troubleshooting flowcharts for the charging system are followed by the special service tools and test harnesses used for electrical diagnosis. The chapter then covers electrical component locations, wiring harness layout, the ignition system and ignition control system, spark gap testing, spark plug cap and ignition coil resistance checks, CDI unit output peak voltage measurement, charge coil and pulser coil testing, pulser coil air gap adjustment, engine start switch and engine shut-off switch continuity, thermoswitch and oil pressure switch testing, the starting system, starter relay, starter motor service, and the charging system including lighting coil output and Rectifier Regulator checks. Full wiring diagrams appear at the end.

What You Can Do With This Manual

This service manual supports the full range of maintenance and repair tasks on the Yamaha F50A, FT50B and FT50C four-stroke outboards. You can perform routine periodic checks and adjustments, diagnose starting and running problems using the troubleshooting flowcharts, remove and reinstall the power unit, service the cylinder head and valvetrain, replace the timing belt, rebuild the carburetors, synchronize them, service the lower unit including shimming and backlash adjustment, repair the power trim and tilt system, and test the electrical system from the charging circuit through to the ignition and starting circuits.

The manual gives you the correct tightening torques, service limits, clearances and adjustment values for every procedure. It also identifies the special service tools required for each job, so you can either source them or use the specified equivalents. The exploded diagrams make component order and orientation clear during disassembly and reassembly, and the wiring diagrams provide the circuit detail needed for electrical fault-finding.

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