Description
This 250 page, printed and bound paper 1986-1988 Yamaha YFM225 Service Manual is a reproduction of the original, out of print manual – the cover may differ from what you see here. The photos in this manual are dark, but it is all that is available for this ATV. This manual provides detailed service information, step-by-step repair instruction and maintenance specifications for 1986-1988 Yamaha YFM225 ATVs.
ATV Coverage
1986 Yamaha YFM225S Moto-4
1987 Yamaha YFM225T
1988 Yamaha YFM225U Moto-4
Table of Contents
General Information
Machine Identification
Vehicle Identification Number
Engine Serial Number
Important Information
All Replacement Parts
Gaskets, Oil Seals, And O-rings
Lock Washers/plates And Cotter Pins
Bearings And Oil Seals
Circlips
Special Tools
For Tune-up
For Engine Service
For Middle Gear Service
For Final Gear Service
For Chassis Service
For Electrical Components
Periodic Inspections And Adjustments
Introduction
Periodic Maintenance/lubrication
Engine
Cam Chain Tension Adjustment
Valve Clearance Adjustment
Idle Speed Adjustment
Throttle Lever Adjustment
Fuel Line Inspection
Air Filter Cleaning
Engine Oil Level Inspection
Engine Oil Replacement
Oil Filter Replacement
Exhaust System Inspection
Compression Pressure Measurement
Chassis
Fuel Cock Cleaning
Front Brake Lever Adjustment
Rear Brake Lever And Pedal Adjustment
Brake Lining Inspection
Brake Pads Inspection
Clutch Adjustment
Steering System Inspection
Front And Rear Shock Absorber Adjustment
Wheel Bearings Check
Cable Inspection And Lubrication
Levers, Pedal, Etc Lubrication
Knuckle Shafts, Lower Arms And
Steering Shaft Lubrication
Tires Check
Wheels Check
Final Gear Oil Level Inspection
Final Gear Oil Replacement
Electrical
Ignition Timing Check
Battery Inspection
Spark Plug Inspection
Headlight Bulb Replacement
Headlight Beam Adjustment
Fuse Inspection
Circuit Breaker Inspection
Engine Overhaul
Engine Removal
Preparation For Removal
Front Carrier And Front Fender
Rear Carier And Rear Fender
Rear Brake
Exhaust Pipe And Muffler
Rear Wheel Drive Assembly And Swingarm
Carburetor
Wirings And Pipe
Starter Motor
Engine Removal
Disassembly
Cylinder Head And Cylinder
Piston
Crankcase Spacer {left!
Cdi Magneto
Clutch
Crankcase Spacer (left)
Sub Transmission
Oil Pump And Shifter
Balancer Drive And Driven Gears
Middle Gear
Crankcase
Transmission And Crankshaft
Inspection And Repair
Rocker Arms And Rocker Arm Shafts
Camshaft
Cam Chain
Cam Sprocket And Cam Drive Sprocket
Chain Dampers
Cam Chain Tensioner
Tappet Cover And Side Cover
Cylinder Head
Valve, Valve Guide And Valve Seat
Cylinder
Piston, Piston Ring, And Piston Pin
Primary Gears And Starter
Primary Clutch
Secondary Clutch
Oil Pump
Crankshaft’
Transmission And Sub Transmission
Middle Gear
Bearings
Circlips And Washers
Engine Assembly And Adjustment
Crankshaft And Transmission
Crankcase
Middle Gear
Balancer Drive And Driven Gears
Oil Pump And Shifter
Sub Transmission
Crankcase Spacer (right)
Clutch
Cdi Magneto
Crankcase Spacer (left)
Piston
Cylinder And Cylinder Head
Remounting Engine
Middle Gear Service
Drive Axle Positioning
Middle Drive Gear
Middle Driven Gear
Carburetion
Carburetor
Sectional View
Removal
Disassembly
Inspection
Assembly
Installation
Adjustment
Chassis
Front Wheel
Removal
Inspection
Installation
Rear Wheel And Rear Axle
Removal
Inspection
Installation
Rear Brake
Removal
Inspection
Installation
Steering System
Removal
Inspection
Installation
Steering Knuckles And Tie-rod Ends
Removal
Inspection
Installation
Adjustment
Front Shock Absorber And Lower Arm
Removal
Free Play Inspection
Inspection
Installation
Rear Shock Absorber And Swing Arm
Handling Notes
Notes On Disposal
Removal
Free Play Inspection
Inspection
Installation
Shaft Drive
Troubleshooting
Final Drive Gear
Drive Shaft
Electrical
Yfm225s Circuit Diagram
Electrical Components
Electrical Starting System
Circuit Diagram
Troubleshooting
Starting Circuit Operation
Battery Inspection
Starter Motor Test
Starter Relay Test
Starting Circuit Cut Off Relay Test
Charging System
Circuit Diagram
Troubleshooting
Battery Inspection
Charging Voltage Test
Charging Coil Resistance Test
Ignition System
Circuit Diagram
Troubleshooting
Ignition Timing Check
Ignition Spark Gap Test
Sparkplug Inspection
Ignition Coil Resistance Test
Pick-up Coil Resistance Test
Source Coil Resistance Test
Lighting System
Circuit Diagram
Lighting Test And Checks
Switches Test
Accessory System
Circuit Diagram
Troubleshooting
Circuit Breaker Inspection
Main Switch Test
Appendices
Specifications
General Specifications
Maintenance Specifications
General Torque Specifications
Definition Of Units
Conversion Tables
Lubrication Diagram
Cable Routing
Yfm225s Wiring Diagram
