1983-1987 Yamaha QT50 Yamahopper Scooter Service Manual

Description

This 1983-1987 Yamaha QT50 Yamahopper Service Manual is a reproduction of the original, first run lithographed, manual. This book provides detailed service information, step-by-step repair instruction and maintenance specifications for 1983 Yamaha QT50K Yamahopper, 1984 Yamaha QT50L Yamahopper, 1985 Yamaha QT50N Yamahopper, 1986 Yamaha QT50S Yamahopper and 1987 Yamaha QT50T Yamahopper motorcycles.

Table of Contents

GENERAL INFORMATION
MACHINE IDENTIFICATION
SPECIAL TOOLS

PERIODIC INSPECTION AND ADJUSTMENTS
INTRODUCTIONINTRODUCTIONMAINTENANCE INTERVALS CHARTS
A Maintenance Intervals
B Lubrication Intervals
ENGINE
A Carburetor
B Air Cleaner
C Autolube Pump
D Engine and Transmission Oil
E Cylinder Head
CHASSIS
A Brake and Wheel (Front, Rear)
B Steering and Suspension
ELECTRICAL
A Ignition Timing
B Spark Plug
C Battery
D Headlight Beam Adjustment

ENGINE OVERHAUL
REMOVAL
A Preparation for Removal
B Exhaust
C Carburetor
D Removal
DISASSEMBLY
A Reed Valve Assembly
B Main Stand
C Kick Crank (Kick Starter)
D Drive Shaft (Rear Arm Comp)
E Magneto
F Cylinder Head and Cylinder
G Piston Pin and Piston
H Crankcase Cover Right
I Clutch Assembly and Primary Drive Gear
J Kick Shaft Assembly Drive Gear and Kick Pinion Gear
K Transmission
L Crankcase
M Crankshaft
INSPECTION AND REPAIR
A Cylinder Head
B Cylinder
C Piston Pin and Bearing
D Piston
E Piston Rings
F Autolube Pump
G Clutch
H Kick Starter
I Transmission
J Crankshaft
K Bearing and Oil Seals
L Crankcase
ENGINE ASSEMBLING AND ADJUSTMENT
A Crankshaft Installation
B Crankcase
C Transmission Installation
D Kick Starter Assembly
E Primary Drive Gear and Clutch Assembly
F Crankcase Cover (Right)
G Piston
H Cylinder
I Cylinder Head
INSTALLING

CARBURETION
CARBURETOR
A Inspection and Repair
REED VALVE ASSEMBLY
A Inspection

CHASSIS
FRONT WHEEL
A Removal
B Front Axle Inspection
C Front Wheel Inspection
D Brake Shoe Wear Inspection
E Brake Drum Inspection
F Brake Shoe Plate Inspection
G Replacing Wheel Bearing
H Installing Front Wheel
REAR WHEEL
A Removal
B Rear Wheel Inspection
C Brake Shoe Wear Inspection
D Rear Drum Inspection
E Brake Shoe Plate Inspection
F Installing Roar Wheel
SHAFT DRIVE
A Removal
B Shaft Drive Inspection
FRONT FORKS
A Disassembly
B Inspection
C Reassembly
STEERING HEAD
A Inspection
CABLES AND FITTING
A Cable Maintenance
B Throttle Maintenance
C Cable Junction Maintenance

ELECTRICAL
IGNITION SYSTEM
A Capacitor Discharge Ignition (CDI)
B Wiring Connections
C Checking the Magneto Charge Coil and Pulser Coil
D Ignition Timing
E Spark Gap Test
F Ignition Coil
G Spark Plug
CHARGING SYSTEM
A Charging Circuit Test
B Checking Silicon Rectifier
C Battery
LIGHTING AND SIGNAL SYSTEMS
A Lighting Tests and Checks — AC Circuit
B Lighting Tests and Checks — DC Circuit

APPENDICES
GENERAL SPECIFICATIONS
A General
B Engine
C Chassis
D Electrical
E Tightening Torque
CABLE ROUTING
WIRING DIAGRAM