Target Audience:
Marine technicians, outboard mechanics, and DIY owners servicing Yamaha mid-range outboards
Application:
Professional shop and owner-level repair, maintenance, and overhaul
Model Class:
Yamaha mid-range two- and three-cylinder outboard motors rated 50 to 90 HP
Coverage:
50G, 60F, 70B, 75C, and 90A outboard models in one manual
Content:
Factory-style service, repair, and maintenance procedures
Use Case:
Scheduled maintenance through major engine and gearcase overhaul
Access:
Printable PDF for Windows and Mac; 30-day money back guarantee
Engine Mechanical:
Cylinder head, cylinder block, pistons, crankshaft, and bearings
Powerhead:
Disassembly, inspection, and reassembly of the powerhead
Fuel System:
Carburetor or fuel injection components, fuel pump, lines, and filters
Ignition System:
CDI ignition, stator, trigger, ignition coils, and spark plugs
Charging System:
Lighting coil, rectifier/regulator, and battery charging circuit
Starting System:
Starter motor, starter relay, neutral switch, and starting circuit
Cooling System:
Water pump, impeller, thermostat, and cooling passages
Lubrication System:
Oil injection or premix system and oil pump where equipped
Lower Unit:
Gearcase, driveshaft, propeller shaft, gears, and clutch dog
Midsection:
Mounting bracket, tilt/trim system, and swivel bracket
Electrical:
Wiring harness, sensors, gauges, and trim/tilt controls
Steering:
Remote steering components and tiller handle where equipped
Diagnostics:
Troubleshooting charts for no-start, running, and electrical faults
Adjustments:
Linkage, throttle, timing, and idle adjustments where specified
Disassembly:
Step-by-step teardown sequences for major assemblies
Inspection:
Measurement and wear-limit checks for critical components
Assembly:
Torque sequences and reassembly procedures
Maintenance:
Routine service, inspection, and replacement tasks
Specifications:
Factory tolerances, torque values, and service limits
Illustrations:
Exploded diagrams and component identification views
Units:
Metric and imperial measurements where applicable
Parts Information:
Component identification and part reference throughout procedures
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
Engine Type:
Outboard Motor
Engine Codes:
50G, 60F, 70B, 75C, 90A
Displacement and Configuration
50G Displacement:
742 cc (45.3 cu. in.)
60F Displacement:
N/A - not specified in source data
70B Displacement:
849 cc (51.8 cu. in.)
75C Displacement:
N/A - not specified in source data
90A Displacement:
N/A - not specified in source data
50G Cylinders:
3-Cylinder
60F Cylinders:
N/A - not specified in source data
70B Cylinders:
N/A - not specified in source data
75C Cylinders:
N/A - not specified in source data
90A Cylinders:
N/A - not specified in source data
Fuel System:
Fuel Injection (likely, for these models)
Ignition System:
CDI (Capacitor Discharge Ignition)
Drive:
Outboard Propeller Drive
Wheelbase:
Not applicable - outboard motor
Length:
N/A - varies by model and shaft length
Shaft Lengths:
N/A - not specified in source data
Curb Weight:
N/A - varies by model; refer to manual
Dry Weight:
N/A - not specified in source data
Start-in-Gear Protection:
Neutral start switch prevents starting in gear where equipped
Engine Overheat Warning:
Overheat warning horn and protection circuit where equipped
Oil Level Warning:
Oil injection warning system on equipped models
Kill Switch:
Engine stop lanyard provision where equipped
Cowl Latch:
Secure engine cover retention
Crash Test Information:
Not applicable - outboard motor
Audio System:
Not applicable - outboard motor
Gauge Compatibility:
Yamaha multi-function gauges where equipped
Tilt and Trim:
Power trim and tilt system where equipped
Warning Systems:
Overheat, low oil, and charge warnings
Scheduled Maintenance:
Refer to manual for detailed service intervals based on operating hours or time
Recommended Oil Type:
Yamaha Outboard Gear Oil (refer to manual for specific viscosity)
Engine Oil:
Yamalube 2M or equivalent TC-W3 where applicable
Water Pump Impeller:
Common wear item; inspect and replace per interval
Spark Plugs:
Routine replacement and gap check
Fuel Filters:
Inspect and replace at scheduled intervals
Anodes:
Inspect and replace as needed to prevent corrosion
Gearcase Seals:
Inspect for leaks and water intrusion
Manufacturer:
Yamaha Motor Company
Founded:
1955, outboard production began in 1960
Reputation:
Known for reliable, durable marine engines
Engine Codes:
50G, 60F, 70B, 75C, 90A
Generation:
Specific to models 50G, 60F, 70B, 75C, 90A
Design Focus:
Mid-range two- and three-cylinder outboards for recreational and commercial use
Production Location:
N/A - not specified for this model
