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Honda XR80R Service Manual

Honda XR80R
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TROUBLESHOOTING
ENGINE LACKS POWER
1. Raise
whee
l
off
the
ground
and spin
by
----
Wheels
do
not
spin
--
-.
hand
freely
I
Wheels
spins
freely
j
2.
Check
tire
pressure
-----------
Pressure l
ow
-
----
_
I
Pressure
norma
l
j
3
Accelerate rapi
dly
fr
om
low
to
second
----
Engine speed
doesn'
t
__
I chango
accordingly
Engine
speed
r
educed
w
hen
clutch
is when elUleh is fClcased
released
j
4. Accelerate li
ght
ly
------------
Engine speed
does
---
_
I
nOl
increase
'r"'
""d
;""'"
S. Chock
ignition
ti
ming
-----------
I
ncorrect
-------
.
I
Correct
j
6.
Test cyl
inde
r
compress
i
on
---------
In
corrcct
--
- -
---
.
I
Norma
l
j
7. Check
carbureto
r
for
clogg
ing
-------
Cl
ogged
-------
_
I
Not
clogged
j
8.
Rcmolle
spark plug
I
----------
- Fouled
or
disco
lored
N
ot
fouhld
or
di
scolor!ld
j
9. Check oil level and condition
-----
---Incorre<:t
-------
_
I
Co
rr
ec
t
j
10.
Remove
cyl
inder
head
cover
and inspect
---
Va
l
ve
tra
in
nO
I
---
-
__
lubr
icat
io
n I
LJ
bricated
prope
rly
I
Va
lve train I
LJbrica
ted
proper
ly
J
15-2
Possible
ca
use
• Brake
dragg
i
ng
•
Worn
or
damage
d vvneel bear
ing
•
Fa
ul
ty
ti
re
valve
• Punctured tire
• Cl
utch
slipping
•
Worn
clutch
discs/plates
•
Warped
clutch
discs/p
lates
• Weak
clutch
spring
•
Additive
in
engine
oi
l
• Choke valve closed
• Cl
ogged
air
cl
eaner
• Restricated fuel
flow
• Cl
ogged
mu
H
ler
• Pinched fuel tank
breather
tube
• Faulty
ignition
co
n
Tro
l
module
• FaUlty
ignition
pulse
genera
t
or
• V
ll
i
ve
stuck
open
•
Worn
cylinder
Md
piston
ri
n
gs
• L
ea
king head gasket
• I
mpr
o
pe
r
va
l
ve
ti
ming
•
Carburetor
not
serviced
frequ
ently
eno
u
gh
• Plugs
nOT
serviced frequ
ently
enough
• Spark plug
ale
the
i
ncorrect
heat
range
• Oil level
too
hi
gh
• Oil level 100 l
ow
• Co
ntaminated
oi
l
•
Clogged
o
il
passage
•
Clogged
oil
con
l
ro
l
or
ifice

Table of Contents

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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.

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