EasyManua.ls Logo

Honda XR80R Service Manual

Honda XR80R
227 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #101 background imageLoading...
Page #101 background image
CYLINDER COMPRESSION TEST
If
the
engine
must
be
running
to
do
some
work.
make
sure
the
area is well ventilated, Never run
the
engine in an enclosed area. The exhaust contains
poisonous
carbon
monoxide
gas
rhllt
may
cauS6
loss of
consciousness
and
may
lead
to
dellth.
Run
the
e
ngine
in an
open
area or
with
an e
xhaust
evacuation
system
in enc/ased area.
W ar m
up
(he
engi
n e
to
nOfmal
operat
in
g
tempera
ture.
Stop
the
engine
and
remove
th
e sark plug.
Install
a
com
pression ga
uge.
Open
the
th
r
ottle
ai
lihe
way
and
crank the
eng
ine
wit
h
the
kic
kstarter
un
li
l the
gauge
reading
St
OPS
rising.
COMPRESSION PRESSURE:
XR
100R:
',21
kPa (
11
.5
kgffem
', 164 psi)
at
300 r
pm
XR
80R: 1176 k
Pa
112.0 kgfl
cm
'.
171
psI)
at
1
,000
r
pm
Low compression can
be
caused b
y:
- Bl
own
cylinder
head gasket
-
Im
pr
oper
va
l
ve
adjust
ment
- Va
lve
le
akage
-
Worn
piston
ring
or
cy
linde
r
H
igh
compression
can be
ca
...
sed by:
- Ca rb
on
deposi
ts
in
combust
ion
chamber
or
o n
pist
on
head
CAMSHAFT REMOVAL
Remove
the
f
ol
l
ow
ing
- Side cover (page 2
-21
- Seat
Ipage
2-21
- F
uel
tank (page 2·
3)
- Le
ft
cra nkcase
cover
(page t3-9)
Remove
the
two
bOlts and
cylin
der head cover.
Loosen
the cam
chain
tensioner
adju
sting bolt lock
nut
and
adjuster.
CYLINDER HEAD/VALVES
CO
M
PRESS
ION
GAU
GE
7-3

Table of Contents

Question and Answer IconNeed help?

Do you have a question about the Honda XR80R and is the answer not in the manual?

Honda XR80R Specifications

General IconGeneral
Displacement79cc
Compression Ratio9.7:1
Fuel SystemCarburetor
IgnitionCDI
Transmission5-speed
Final DriveChain
Front BrakeDrum
Rear BrakeDrum
Front Tire2.50-16
Rear Tire3.00-14
Ground Clearance9.1 inches
Engine TypeAir-cooled single-cylinder four-stroke
Bore x Stroke47.5mm x 45mm
Rear SuspensionSingle shock

Summary

General Information

General Safety

Covers critical safety precautions for operating and servicing the motorcycle, including ventilation and handling hazardous materials.

Service Rules

Provides essential guidelines for performing maintenance and repairs, emphasizing the use of genuine parts and proper techniques.

Model Identification

Details how to identify the motorcycle model using frame and engine serial numbers, VIN, and color labels.

Specifications

Lists detailed technical specifications for the motorcycle's dimensions, frame, and engine components for XR100R and XR80R.

Torque Values

Specifies critical torque values for various fasteners across different systems, essential for proper assembly and safety.

Tools

Lists special tools required for specific maintenance and repair procedures, including part numbers and availability.

Lubrication & Seal Points

Details the location and type of lubricants and sealants required for engine and frame components.

Cable & Harness Routing

Illustrates the correct routing for cables and wiring harnesses on the motorcycle for proper function and aesthetics.

Emission Control Systems

Explains the function and components of the exhaust and crankcase emission control systems for compliance and performance.

Frame, Body Panels, and Exhaust System

Service Information

Provides general service information, torque values, and troubleshooting tips for the frame, body panels, and exhaust system.

Fuel Tank

Details the removal and installation procedures for the fuel tank, including safety warnings and torque specifications.

Muffler/Exhaust Pipe

Covers the removal and installation of the muffler and exhaust pipe, including safety warnings and torque values.

Maintenance

Service Information

General safety precautions and guidelines for performing maintenance tasks on the motorcycle.

Maintenance Schedule

Outlines the recommended maintenance intervals and tasks for the motorcycle based on mileage or time.

Spark Plug

Provides instructions for inspecting, reusing, and replacing the spark plug, including gap specifications.

Valve Clearance

Details the procedure for inspecting and adjusting valve clearance while the engine is cold.

Engine Oil

Covers oil level inspection and the procedure for changing the engine oil, including recommended oil types.

Drive Chain

Explains how to inspect and adjust drive chain slack, clean, lubricate, and check for wear.

Brake System

Details the adjustment procedures for both front and rear brakes, including free play measurements.

Steering Head Bearings

Covers the inspection and adjustment of steering head bearings to ensure smooth and safe steering operation.

Lubrication System

Service Information

General safety warnings and procedures related to the lubrication system, including oil pump servicing.

Specifications

Lists technical specifications for engine oil capacity, recommended oil, and oil pump rotor clearances.

Oil Pump

Details the removal, inspection, and assembly procedures for the engine oil pump.

Fuel System

Service Information

General safety precautions, notes on cable operation, and procedures for fuel system component removal.

Carburetor Removal

Step-by-step instructions for removing the carburetor, including air cleaner housing and throttle valve procedures.

Pilot Screw Adjustment (XR100R)

Procedure for adjusting the pilot screw for idle drop to achieve optimal engine performance.

Air Screw Adjustment (XR80R)

Procedure for adjusting the air screw to achieve optimal idle speed and engine performance.

High Altitude Adjustment

Instructions for adjusting carburetor settings for high-altitude riding to ensure proper engine operation.

Engine Removal/Installation

Service Information

General guidelines and precautions for engine removal and installation, including support and component servicing.

Engine Removal

Detailed steps for safely removing the engine from the motorcycle frame, including draining fluids and disconnecting components.

Engine Installation

Step-by-step instructions for reinstalling the engine into the motorcycle frame, ensuring correct alignment and bolt tightening.

Cylinder Head/Valves

Service Information

General information and precautions for servicing the cylinder head, valves, and camshaft.

Cylinder Compression Test

Procedure for performing a cylinder compression test to diagnose engine performance issues.

Camshaft Removal

Detailed steps for removing the camshaft, including cam chain tensioner and sprocket procedures.

Valve Guide Replacement

Instructions for replacing valve guides, including necessary tools and procedures for proper installation.

Valve Seat Inspection/Refacing

Covers inspection of valve seats and procedures for refacing them to ensure proper sealing and performance.

Cylinder/Piston

Service Information

General notes and specifications for servicing the cylinder and piston components.

Piston Removal

Step-by-step instructions for removing the piston from the cylinder, including handling piston pin clips.

Cylinder/Piston Inspection

Details how to inspect the cylinder bore for wear and measure piston dimensions and clearances.

Piston Installation

Instructions for installing the piston rings and the piston into the cylinder, ensuring correct orientation and gap.

Clutch/Gearshift Linkage

Service Information

General information on clutch and gearshift linkage service, including specifications and torque values.

Clutch

Details the removal, inspection, and servicing of clutch components like discs, plates, and springs.

Primary Drive Gear

Covers the removal and installation of the primary drive gear, including related components.

Gearshift Linkage

Explains the disassembly and assembly of the gearshift linkage, including the shift drum and spindle.

Crankshaft, Transmission, and Kickstarter

Service Information

General information and precautions for servicing the crankshaft, transmission, and kickstarter.

Crankshaft

Details the removal, inspection, and installation of the crankshaft and its bearings.

Transmission

Covers the removal, disassembly, inspection, and bearing replacement for the transmission system.

Kickstarter

Explains the removal, disassembly, inspection, and installation of the kickstarter assembly.

Front Wheel, Brake, Suspension, and Steering

Service Information

General safety advice and procedures for servicing front wheel, brake, fork, and steering components.

Front Wheel

Details the removal, inspection, disassembly, and assembly of the front wheel and its bearings.

Fork

Covers the removal, disassembly, inspection, and assembly of the front fork components.

Steering Stem

Provides instructions for removing, replacing bearings, and installing the steering stem assembly.

Rear Wheel, Brake, Suspension

Service Information

General safety advice and specifications for servicing rear wheel, brake, shock absorber, and swingarm.

Rear Wheel

Details the removal, inspection, disassembly, and assembly of the rear wheel and its components.

Rear Brake

Covers the removal, inspection, disassembly, and assembly of the rear brake system.

Shock Absorber

Instructions for removing, disassembling, inspecting, and assembling the rear shock absorber unit.

Swingarm

Details the removal, inspection, and bushing replacement procedures for the motorcycle's swingarm.

Ignition System

Service Information

General safety precautions and notes regarding ignition system servicing, including component damage risks.

Ignition System Inspection

Guidelines for inspecting the ignition system, including peak voltage measurements and connection checks.

Ignition Coil

Provides removal and installation instructions for the ignition coil.

Ignition Control Module

Details the removal and installation procedures for the ignition control module (ICM).

Flywheel/Stator

Covers the removal and installation of the flywheel and stator assembly, including the woodruff key.

Wiring Diagram

Troubleshooting

Engine Does Not Start or Is Hard to Start

Diagnostic flow chart for identifying causes of starting problems, from fuel flow to ignition and compression.

Engine Lacks Power

Troubleshooting guide for diagnosing reasons why the engine lacks power, covering various systems.

Poor Handling

Identifies causes for poor handling issues such as heavy steering, wheel wobble, or pulling to one side.

Related product manuals