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MOTO GUZZI Le Mans 850 User Manual

MOTO GUZZI Le Mans 850
53 pages
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ADDITIONS AND CHANGES TO THE WORKSHOP
MANUAL FOR V 7
SPORTĀ·
750 S .
850
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MOTO GUZZI Le Mans 850 Specifications

General IconGeneral
Displacement844 cc
Bore x Stroke83 mm x 78 mm
Transmission5-speed
Final DriveShaft
Front SuspensionTelescopic forks
Engine TypeAir-cooled, V-twin
Power71 hp
FrameSteel tubular
Rear SuspensionTwin shocks
Front BrakesDual 300 mm discs
Rear Brakes242 mm disc
Seat Height800 mm
Fuel Capacity22 liters

Summary

Main Features

Engine Mechanicals

Details engine dimensions, displacement, compression, output, valve gear, and transmission.

Engine Systems

Covers carburetion, lubrication, ignition, and starting system specifications.

Chassis and Performance

Outlines frame, suspension, brakes, dimensions, weight, and performance figures.

Fuel and Oil Capacities

Fuel Tank Capacity and Grade

Specifies fuel tank size and recommended petrol grade.

Engine Oil Specifications

Details sump oil quantity and recommended type.

Gearbox and Rear Drive Box Oil

Lists oil capacities and types for gearbox and rear drive.

Front Fork and Brake Fluid

Specifies oil for front forks and fluid for brakes.

Engine Inspection and Overhauling

Cylinder Head and Valve Guide Procedures

Instructions for removing and installing valve guides.

Valve and Valve Guide Coupling Data

Provides critical dimensions for valve and guide fitment.

Valve Seat Grinding

Details the process for regrinding valve seats.

Valve Specifications

Lists clearances and plate dimensions for valves.

Cylinders, Pistons, and Piston Rings

Cylinder Bore Measurement and Oversizes

Guides for measuring cylinder bore and available oversizes.

Cylinder Selection Classes

Explains matching cylinder classes to piston classes.

Piston Specifications and Selection

Details piston measurements, balancing, and selection.

Piston Ring Data

Lists specifications for upper seal, middle seal, and oil scraper rings.

Con-rods and Crankshaft

Con-rod Selection and Torque

Details con-rod selection criteria and cap nut torque.

Crankshaft Specifications and Undersizes

Lists crankshaft dimensions and bearing undersizes.

Crankshaft Selection Criteria

Explains selection based on shoulder marks.

Crankshaft Balance Inspection

Describes how to check crankshaft balance.

Valve Gearing

Valve Timing Data

Specifies timing points for inlet and outlet valves.

Camshaft Bearing and Housing Data

Provides dimensions for camshaft bearings and housings.

Tappet and Guide Coupling Data

Lists dimensions for tappets and their guides.

Camshaft Assembly Procedure

Step-by-step guide for fitting the camshaft assembly.

Checking Valve Timing (Engine Installed)

Procedure to verify valve timing on the vehicle.

Lubrications

Engine Oil Lubrication and Filter

Details engine oil type, filter, and changing intervals.

Gearbox Lubrication

Specifies oil checks and changes for the gearbox.

Rear Drive Box Lubrication

Details oil checks and changes for the rear drive box.

Carburetion

Carburettor Components and Settings

Lists carburettor types and standard settings.

Floater Levelling Procedure

Step-by-step guide for adjusting float levels.

Idling Speed and Mixture Adjustment

How to adjust carburetion and idling without a vacuum meter.

Vacuum Meter Carburetion Adjustment

Procedure for synchronizing carbs using a vacuum meter.

Gearbox

Gearbox and Drive Ratios

Lists internal and overall gear ratios.

Rear Drive Box Stripping and Assembly

Procedures for disassembling and reassembling the rear drive box.

Crown and Pinion Matching

Explains how to match crown and pinion gears.

Housing and Cover Fitting

Guides for fitting the gearbox housing and cover.

Rear Swinging Fork

Rear Swinging Fork Overhauling

Inspection and maintenance of the swinging fork.

Bearing Removal from Swinging Fork

Methods for removing bearings from the fork.

Adjusting Rear Swinging Fork Play

Procedure to ensure free swing without play.

Rear Suspension

Rear Shock Absorber Adjustment

Describes adjusting shock absorbers to three positions.

Spring Features and Replacement

Lists spring specifications and when to replace them.

Wheels and Brakes

Front Wheel Removal and Refitting

Steps for removing and reinstalling the front wheel.

Rear Wheel Removal and Refitting

Steps for removing and reinstalling the rear wheel.

Braking Disc Truing

How to true the brake disc between pads.

Brake Pad Replacement

Procedure for replacing brake pads in calipers.

Maintenance and Adjustments

Clutch Control Lever Adjustment

Adjusting the free play of the clutch lever.

Front Brake Lever Adjustment

Adjusting the play on the front brake lever.

Brake Pad and Disc Wear Check

How to check brake pad thickness and disc condition.

Brake Fluid Level and Air Bleeding

Checking fluid levels and bleeding air from the brake system.

Electric Equipment

Battery System

Installation, service, and specifications.

Alternator and Generator Specifications

Details on the alternator/generator brand and output.

Alternator Charging System

On-Vehicle Charging System Inspection

Checking charging system performance without removal.

Diode Testing Procedures

Methods for testing positive, negative, and exciting diodes.

Stator and Rotor Winding Resistance Tests

Measuring winding resistance for stator and rotor.

Alternator Charging System Faults

Fault Cause and Remedies

Lists common faults and their corresponding remedies.

Regulator, Rectifier, and Starter Motor

Specifications and Electrical Tests

Details specifications and electrical test procedures for components.

Ignition System

Double Contact Breaker Maintenance

Checking and adjusting breaker points.

Ignition Timing Adjustment

Procedures for timing right and left cylinders.

Ignition Data and Spark Plugs

Lists ignition timing specs and spark plug recommendations.

Acoustic System

Horn Features

Describes the electric horn type and absorption.

Lighting System

Headlight and Bulb Replacement

Instructions for replacing headlight bulbs.

Tail Light and Turn Indicator Bulbs

Procedures for replacing tail and turn signal bulbs.

Instrument Panel Lighting and Indicators

Details on instrument panel bulbs and warning lights.

Headlight Beam Adjustment

How to adjust headlight beam for optimal visibility.

Controls

Handlebar Controls (Clutch, Throttle, Starter)

Operation of clutch, throttle, and starter controls.

Brake Control Levers and Pedals

Details on front and rear brake control operation.

Gearshift and Steering Controls

Operation of gearshift pedal and steering damper.

Fuel System and Stands

Operation of fuel filler cap, taps, and side stand.

Overall Gear Ratios

Gear Ratios with Clutch Shaft Z/17

Table of overall gear ratios for Z/17 clutch shaft.

Gear Ratios with Clutch Shaft Z/16

Table of overall gear ratios for Z/16 clutch shaft.

Engine Powering Kit

Kit Components and Settings

Lists kit parts and inlet/outlet tube settings.

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