Target Audience:
Outboard owners, marine technicians, and workshop mechanics
Intended Use:
Component identification and replacement-parts procurement
Engine Class:
Portable 20 hp 2-stroke outboard
Parts Identification:
Exploded diagrams with factory part numbers for each assembly
Systems Covered:
Cowling, cylinder, crankshaft, fuel system, starter, electrical, drive unit
Construction:
Corrosion-resistant components for saltwater and freshwater operation
Advantage:
Enables accurate ordering of genuine replacement parts without guesswork
Model Covered:
Yamaha 20CMH, 2004
Coverage Areas:
Top cowling, cylinder, crankshaft, fuel system, starter, electrical components, drive units
Manual Type:
Factory Parts Catalogue
Content:
Exploded diagrams and part numbers
Delivery Method:
Instant download
Page Count:
N/A - not stated in supplier data
Top Cowling:
Cowling and cowling lock components
Cylinder:
Cylinder block, cylinder head, and piston assemblies
Crankshaft:
Crankshaft, connecting rod, and bearing components
Crankcase:
Crankcase and associated gaskets and seals
Carburetor:
Carburetor body, jets, and linkage parts
Fuel System:
Fuel pump, fuel lines, tank connections, and filters
Intake:
Intake manifold and reed valve components
Starter:
Recoil/starter assembly components
Ignition:
Flywheel, magneto, coil, and spark plug parts
Electrical Components:
Wiring harness, switches, and charging components
Drive Unit:
Gearcase housing, gears, and bearings
Propeller:
Propeller and propeller shaft components
Water Pump:
Impeller and water pump housing parts
Lower Unit Seals:
Seals, gaskets, and lubricant fittings
Bracket and Steering:
Mounting bracket, swivel bracket, and tiller handle parts
Trim and Tilt:
Manual tilt components and fasteners
Technical Depth:
Assembly-level exploded views with factory part numbers
Parts Information:
Component names, part numbers, and quantity references
Procedures Included:
Parts identification and replacement referencing; no step-by-step repair procedures
Navigation:
System-by-system grouping for fast part lookup
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
Standard Transmission:
Forward-Neutral-Reverse gearcase with dog clutch
Optional Transmission:
N/A - single gearcase configuration offered
Gear Ratio:
N/A - not stated in supplier data
Shift Control:
Tiller-mounted shift lever
Propeller Shaft:
Splined propeller shaft with shear pin or spline drive
Shaft Length:
Available in short and long shaft configurations
Wheelbase:
N/A - not applicable to outboard motors
Length:
N/A - not stated in supplier data
Curb Weight:
N/A - not stated in supplier data
Dry Weight:
N/A - not stated in supplier data
Kill Switch:
Emergency stop lanyard provision
Cowling Lock:
Secures top cowling during operation
Neutral Start:
Starts only in neutral shift position
Crash Test Information:
N/A - not applicable to outboard motors
Certification:
N/A - not stated in supplier data
Service Intervals:
Per Yamaha factory schedule for 2-stroke outboards
Water Pump Impeller:
Inspect or replace at scheduled intervals
Gearcase Lubricant:
Check level regularly; replace at service intervals
Spark Plugs:
Inspect and replace as specified in owner service data
Fuel Mixture:
2-stroke fuel and oil pre-mix per Yamaha specification
Gearcase Oil:
Marine gearcase lubricant per Yamaha specification
Impeller:
Common wear item; replacement recommended on schedule
Anodes:
Corrosion anodes require periodic inspection and replacement
Carburetor Components:
Jets and gaskets subject to varnish and wear
