Target Audience:
Outboard engine technicians, marine mechanics, and DIY owners servicing the 1987 Yamaha V6 EXCEL H
Manual Purpose:
Identify and locate replacement parts for maintenance and repair
Key Features:
Exploded component diagrams with part references for the complete engine assembly
Key Features:
Covers powerhead, midsection, and lower unit components
Key Features:
Supports ordering the correct OEM replacement parts by component group
Advantage:
Factory-based parts breakdowns reduce guesswork and incorrect part orders compared to generic aftermarket listings
Powerhead:
Cylinder block, cylinder heads, pistons, crankshaft, and crankcase components
Induction:
Carburetor assemblies, intake manifold, and reed valve components
Ignition:
Flywheel magneto, ignition coils, CDI unit, and spark plug specifications
Electrical:
Starter motor, charging coils, wiring harness, and electrical connectors
Fuel System:
Fuel pump, fuel lines, filters, and fuel connector assemblies
Cooling System:
Water pump, impeller, thermostat, and cooling passages
Exhaust System:
Exhaust housing, exhaust plate, and exhaust tuner components
Midsection:
Mounting brackets, swivel bracket, tilt tube, and steering components
Lower Unit:
Gearcase housing, forward and reverse gears, driveshaft, and propeller shaft
Trim and Tilt:
Power trim and tilt unit components where applicable
Lubrication:
Oil injection pump and oil lines where equipped
Parts Information:
Exploded diagrams with referenced part numbers for every assembly group
Procedures Included:
Component identification, disassembly sequence, and reassembly reference
Technical Depth:
Parts-level detail; torque and clearance values where printed in the factory manual
Diagrams:
Exploded views for each major assembly and subassembly
Part Number Reference:
Part numbers indexed to each illustrated component
Specifications:
Application data for the 1987 Yamaha V6 EXCEL H engine
Suitability:
Supports routine maintenance, overhaul planning, and replacement part ordering
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 Configuration:
V6 two-stroke, 90-degree
Displacement:
N/A - not specified in the source description
Starting System:
Electric start
Lubrication:
Oil injection (variable ratio) with pre-mix option
Ignition:
Capacitor discharge ignition (CDI)
Horsepower:
N/A - consult the factory specification plate for this engine
Bore and Stroke:
N/A - not specified in the source description
Compression:
N/A - not specified in the source description
Standard Transmission:
Forward, neutral, and reverse gearcase with mechanical shift
Optional Transmission:
N/A - no optional gearcase listed for this model
Gear Ratio:
N/A - not specified in the source description
Clutch Type:
Dog clutch engagement in the gearcase
Shift Control:
Remote or tiller-mounted shift lever depending on rigging
Propeller Shaft:
Splined propeller shaft with replaceable hub
Lubrication:
Gearcase lubricant, level checked at the vent and fill screws
Steering:
Swivel bracket with tilt tube for cable or hydraulic steering
Wheelbase:
N/A - not applicable to outboard engines
Length:
N/A - varies with shaft length option
Shaft Length:
N/A - not specified in the source description
Transom Height:
N/A - not specified in the source description
Width:
N/A - not specified in the source description
Height:
N/A - not specified in the source description
Curb Weight:
N/A - dry engine weight not specified in the source description
Weight Note:
Refer to the engine identification plate for exact rigged weight
Safety Ratings:
N/A - outboard engines are not crash tested
Overheat Protection:
Overheat warning buzzer and temperature sensor
Over-Rev Protection:
N/A - not specified in the source description
Neutral Start:
Start-in-gear prevention switch in the remote control
Kill Switch:
Engine stop lanyard / emergency kill switch
Tilt Lock:
Tilt lock lever for service and trailering
Anodes:
Sacrificial anodes for corrosion protection
Infotainment:
N/A - not applicable to outboard engines
Audio System:
N/A - not applicable to outboard engines
Driver Assistance:
N/A - not specified in the source description
Instrumentation:
Analog gauge compatibility with optional digital tachometer
Warning System:
Dash-mounted warning lamps for oil level and overheat
Trim Control:
Power trim and tilt switch, where equipped
Charging:
Battery charging coil with rectifier/regulator
Service Intervals:
Follow the factory maintenance schedule for the 1987 V6 EXCEL H
Engine Oil:
Yamaha TC-W3 two-stroke outboard oil
Gearcase Lubricant:
Marine lower unit gear oil, capacity per the factory specification
Spark Plug:
N/A - confirm the specified plug for this engine before installation
Impeller:
Water pump impeller replaced at the recommended interval or after overheating
Fuel Filter:
Replace at scheduled intervals and after storage
Common Wear Items:
Water pump impeller, spark plugs, fuel filter, thermostats, and anodes
Known Issues:
Carburetor gumming from stale fuel, impeller wear, and cooling passage corrosion with age
Storage:
Fog the cylinders and stabilize fuel for lay-up periods
Manufacturer:
Yamaha Motor Company
Brand Heritage:
Yamaha produces outboard engines, motorcycles, and marine products worldwide
Model Evolution:
V6 two-stroke outboards served as Yamaha's large-bore consumer and commercial engines
Production Years:
1987 model year
Production Location:
Japan
Market Segment:
Recreational and commercial marine propulsion
