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Sym Wolf SB 250 Ni User Manual

Sym Wolf SB 250 Ni
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Wolf SB 250 Ni
SERVICE MANUAL
20120309
FOREWORD
HOW TO USE THIS MANUAL
CONTENTS
MECHANISM ILLUSTRATION

Table of Contents

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Sym Wolf SB 250 Ni Specifications

General IconGeneral
Displacement249.4 cc
Transmission6-speed
Fuel SystemElectronic Fuel Injection
Brakes (Front)Disc
Brakes (Rear)Disc
Seat Height790 mm
Fuel Tank Capacity14 liters
CoolingLiquid-cooled
Front SuspensionTelescopic Fork
Engine TypeSingle Cylinder, 4-stroke
Power25 hp @ 7500 rpm
Weight173 kg
Rear SuspensionMono-Shock

Summary

Foreword

Manual Purpose

Manual contains technical data for inspection and repair.

How to use this manual

Manual Structure Explanation

Describes the manual's structure and contents by chapter.

Content

Chapter Index

Lists all chapters and their corresponding page ranges.

Mechanism Illustration

Motorcycle Component Diagrams

Diagrams showing the location of motorcycle components.

General Information

Symbols and Marks

Explains symbols used in the manual for service information.

General Safety

Safety precautions for operating the motorcycle.

Service Precautions

Guidelines for performing maintenance and repairs.

Specifications

Technical data and specifications of the motorcycle.

Torque Values (Engine)

Engine torque specifications for bolts and nuts.

Torque Values (Frame)

Frame torque specifications for bolts and nuts.

Troubleshooting

Troubleshooting guide for common engine issues.

Lubrication Points

Identifies lubrication points on the motorcycle.

Maintenance Information

Precautions in Operation

General safety and operational guidelines for maintenance.

Periodical Maintenance Schedule

Recommended maintenance intervals and tasks for the motorcycle.

Lubrication System

Procedures for engine oil quantity, exchange, and strainer cleaning.

Cylinder compression test

How to perform a cylinder compression test and interpret results.

Fuel System

Maintenance of fuel lines, filter, and air filter elements.

Throttle Operation and Spark Plug

Inspection and adjustment of throttle and spark plug maintenance.

PCV System and Valve Clearance

Maintenance of PCV system and adjustment of valve clearance.

Drive Chain and Steering Mechanism

Inspection and adjustment of drive chain and steering components.

Suspension and Disk Brake Systems

Inspection of suspension system and disk brake components.

Brake Fluid Replacement / Air Bleed

Procedure for replacing brake fluid and bleeding the air from the system.

Front brake caliper

Removal, inspection, and replacement of front brake pads.

Rear brake caliper

Removal, inspection, and replacement of rear brake pads.

Brake Disk and Special Tools

Inspection of brake disk and list of special tools for brake maintenance.

Brake master cylinder

Removal, installation, and maintenance of the brake master cylinder.

Fuel Injection System

EFi System Diagram

Diagram of the EFI system.

EFi System Operation

How the EFI system operates.

EFi System Introduction

Overview of the EFI system features.

Fuel System

Description of the EFI fuel system components.

Ignition System

Principle and specifications of the ignition system.

Crankshaft Position Sensor (CPS)

Description of crankshaft position sensor (CPS).

MAP, TW, TA Sensors

Description of MAP, TW, and TA sensors.

O2 Sensor

Function and testing of the O2 sensor.

TPS

Function and testing of the TPS.

Idle speed control valve (ISC)

Function and testing of the ISC stepping motor.

Air injection solenoid valve (AISV)

Function and principle of the AISV.

ECU Description and Testing

Description of the ECU and its testing procedures.

Throttle Body

Description and treatment of abnormal phenomena of the throttle body.

MAP Sensor

Description and testing procedures for the MAP sensor.

TA Sensor

Description and resistance value measurement of the TA sensor.

TW Sensor

Description and resistance value measurement of the TW sensor.

Rollover sensor

Function and testing procedures for the rollover sensor.

Fuel Pump

Function and testing of the fuel pump.

Fuel Injector

Function and testing of the fuel injector.

Transistor Ignition Coil

Function and resistance measurement of the ignition coil.

Crankshaft position / RPM sensor

Function and resistance measurement of the CPS.

AISV

Function and resistance measurement of the AISV.

EFi system circuit

Wiring diagram for the EFI system.

ECU pin configuration

Pin assignments for the ECU.

EFI Circuit Inspection

Troubleshooting guide for EFI circuit inspection.

Engine Starting Diagnosis

Flowchart for diagnosing starting issues.

Integrated Troubleshooting Procedure

Comprehensive troubleshooting procedure.

Comprehensive Maintenance List

List of maintenance items and procedures.

Lubrication System / Clutch / Transmission

Mechanism Diagram

Exploded view of lubrication, clutch, and transmission components.

Precautions in Operation

General information and precautions for operations in this chapter.

Troubleshooting

Common issues related to lubrication, clutch, and transmission.

Engine Oil Maintenance

Procedures for checking, exchanging, and cleaning engine oil.

Clutch Disassembly

Steps for disassembling the clutch assembly.

Clutch Inspection

Inspection of clutch springs, friction disks, and plates.

Clutch Installation

Steps for installing the clutch assembly.

Clutch Free Play Adjustment

Procedure for adjusting clutch lever free play.

Oil pump

Removal of the oil pump assembly.

Oil pump disassembly

Disassembly and inspection of oil pump components.

Gear shift linkage disassembly

Steps for disassembling the gear shift linkage.

Gear shift linkage mechanism installation

Steps for installing the gear shift linkage.

AC Generator / Starting Clutch

Mechanism Diagram

Exploded view of AC generator and starting clutch components.

Precautions in Operation

General information and precautions for operations in this chapter.

ACG Stator Disassembly

Steps for disassembling the ACG stator.

ACG Stator Inspection

Inspection of ACG stator resistance and voltage generation.

ACG Flywheel / Starter Clutch Disassembly

Steps for disassembling the ACG flywheel and starter clutch.

Starting Clutch Inspection

Inspection of the starting clutch mechanism.

ACG Flywheel / Starter Clutch Assembly

Steps for assembling the ACG flywheel and starter clutch.

Engine Removal

Precautions in operation

General information and precautions for engine removal.

Engine oil capacity and Torque value

Specifications for engine oil capacity and torque values.

Engine removal steps

Step-by-step procedure for removing the engine.

Disconnecting various systems

Disconnecting clutch cable, throttle, sensors, and hoses.

Removing exhaust and drive chain components

Disconnecting ignition, fuel, and removing exhaust and drive chain parts.

Engine mounting bolt removal

Steps for removing engine front and rear mounting bolts.

Cylinder Head / Valve

Mechanism Diagram

Exploded view of cylinder head and valve components.

Precautions in operation

General information and precautions for cylinder head repair.

Specification and Torque Value

Standard measurements and torque values for cylinder head components.

Troubleshooting

Common issues related to cylinder head and valve performance.

Cylinder head removal

Steps for removing the cylinder head.

Cylinder head disassembly

Steps for disassembling the cylinder head, including valves.

Cylinder head inspection

Inspection of cylinder head surface, camshaft, and rocker arms.

Valve guide replacement

Procedure for replacing valve guides.

Valve seat inspection and refacing

Inspection and grinding procedures for valve seats.

Cylinder head assembly

Steps for assembling the cylinder head with valves and springs.

Cylinder head installation

Steps for installing the cylinder head onto the engine.

Valve clearance adjustment

Procedure for adjusting valve clearance.

Cylinder / Piston

Mechanism Diagram

Exploded view of cylinder and piston components.

Precautions in operation

General information and precautions for cylinder and piston repair.

Specification

Standard measurements for cylinder and piston components.

Troubleshooting

Common issues related to cylinder, piston, and rings.

Cylinder removal / inspection

Steps for removing and inspecting the cylinder.

Cylinder inspection

Measuring cylinder inner diameter, taper, and out of round.

Piston removal / inspection

Steps for removing and inspecting the piston and rings.

Piston rings installation

Procedure for installing piston rings onto the piston.

Piston installation

Steps for installing the piston and piston pin.

Cylinder installation

Steps for installing the cylinder onto the engine.

Crank / Crankcase / Shifting gear

Mechanism Diagram

Exploded view of crankcase, crankshaft, and transmission components.

Precautions in operation

General information and precautions for crankcase and transmission repair.

Specification

Standard measurements for crankshaft and gear shift fork components.

Troubleshooting

Common issues related to crankcase, transmission, and gears.

Crankcase disassembly

Steps for disassembling the crankcase and balancing shaft.

Crankshaft inspection

Inspection of crankshaft, bearings, and conrod end clearance.

Transmission disassembly

Steps for disassembling the transmission gears and forks.

Transmission inspection

Inspection of gear shift forks, claws, shaft, and drum.

Crankcase inspection

Inspection of crankcase oil paths and bearings.

Crankcase assembly

Steps for assembling the crankcase with shafts and gears.

Crankshaft and balancing shaft installation

Installation of crankshaft, balancing shaft, and crankcase screws.

Cooling System

Mechanism Diagram

Diagram of the cooling system components.

Precautions in operation

General information and precautions for cooling system service.

Specification

Specifications for coolant capacity, thermostat, and boiling point.

Troubleshooting

Common issues related to cooling system temperature and leakage.

Diagnosis of cooling system

Flowchart for diagnosing cooling system problems.

Coolant change

Procedure for changing coolant and refilling the system.

Radiator Maintenance

Removal, check, and cleaning of the radiator.

Cooling Fan Maintenance

Disassembly, assembly, and installation of the cooling fan.

Water pump Maintenance

Removal, seal inspection, and bearing replacement for the water pump.

Thermostat Maintenance

Removal, inspection, and installation of the thermostat.

Brake System

Mechanism Diagram - Front Disk Brake

Exploded view of the front disk brake system.

Mechanism Diagram - Rear Disk Brake

Exploded view of the rear disk brake system.

Precautions in operation

General information and precautions for brake system service.

Specification and Torque Value

Standard measurements and torque values for brake components.

Troubleshooting

Common issues related to disk brake operation and noise.

Disk brake system inspection

Visual inspection of hoses, pads, and fluid level.

Brake Fluid Replacement / Air Bleed

Procedure for replacing brake fluid and bleeding the air from the system.

Front brake caliper

Removal, inspection, and replacement of front brake pads.

Rear brake caliper

Removal, inspection, and replacement of rear brake pads.

Brake disk

Inspection of brake disk for wear, damage, and runout.

Brake master cylinder

Removal, installation, and maintenance of the brake master cylinder.

Steering / Front wheel / Front fork

Mechanism Diagram

Exploded view of steering, front wheel, and front fork components.

Precautions in operation

General information and precautions for steering and wheel maintenance.

Specification and Torque Value

Standard measurements and torque values for steering components.

Troubleshooting

Common issues related to steering, suspension, and wheel runout.

Steering handlebar removal

Steps for removing the throttle cable, switches, and master cylinder.

Handlebar installation and adjustment

Installation of handlebar components and adjustment of controls.

Front wheel removal and inspection

Steps for removing and inspecting the front wheel axle, bearings, and rim.

Front wheel disassembly and assembly

Disassembly and assembly of the front wheel hub and bearings.

Front wheel installation

Steps for installing the brake disk and front wheel.

Front fork disassembly

Steps for removing the front fork assembly.

Front fork inspection / oil seal replacement

Inspection for oil leaks and replacement of front fork oil seals.

Front fork installation

Steps for installing the front fork assembly.

Steering stem removal

Steps for removing the steering stem and bearings.

Steering stem installation

Steps for installing the steering stem and adjusting preload.

Rear wheel / Rear cushion

Mechanism Diagram

Exploded view of rear wheel, drive chain, and rear cushion components.

Precautions in operation

General information and precautions for rear wheel and cushion maintenance.

Specification

Measurements for axle runout, wheel rim runout, and drive chain slack.

Troubleshooting

Common issues related to rear wheel wobble and suspension.

Rear wheel removal

Steps for removing the rear wheel, brake caliper, and chain adjusters.

Wheel axle and Bearing Inspection

Inspection of wheel axle runout and bearing condition.

Rear wheel installation

Steps for installing the rear wheel and adjusting chain slack.

Drive chain / sprocket inspection

Inspection of drive chain and sprocket teeth condition.

Sprocket / flange removal

Steps for removing the sprocket, nuts, washer, and flange.

Damper rubber inspection

Inspection of damper rubbers for wear or damage.

Drive chain adjustment

Procedure for adjusting drive chain slack and tightening axle nut.

Rear cushion removal

Steps for removing the rear cushion upper and lower bolts.

Swingarm removal

Steps for removing the rear wheel, chain, sprocket, and swingarm.

Swingarm inspection

Inspection of the swingarm for wear or damage.

Swingarm installation

Steps for installing the swingarm with collars, sleeves, and dust seals.

Electrical system

Mechanism Diagram

Diagram of the electrical system components.

Precautions in operation

General information and precautions for electrical system service.

Charging system

Precautions for battery removal, charging, and inspection.

Ignition System

Precautions for checking the ignition system.

Starting system

Precautions for checking the starting system.

Technical specification

Specifications for charging, ignition, and starting systems.

Troubleshooting

Common issues related to charging, ignition, and starting systems.

Fuse circuit

Diagram of the fuse circuit.

Battery inspection

Procedure for measuring battery voltage and charging.

Inspection on Charging Voltage / Current

Measuring charging voltage and current.

Regulator/ rectifier inspection

Inspection of the regulator/rectifier resistance values.

AC Generator

Inspection of the AC generator and its coils.

Ignition circuit

Ignition circuit diagram and coil inspection.

Starting system

Starting circuit diagram and starter relay inspection.

Starter motor maintenance

Removal, inspection, and installation of the starter motor.

Light system

Light circuit diagram for the motorcycle.

Meter Maintenance

Removal and installation of the meter assembly.

Headlight bulb replacement

Procedure for replacing the headlight bulb.

Front turn light bulb replacement

Procedure for replacing the front turn signal bulb.

Rear turn light bulb replacement

Procedure for replacing the rear turn signal bulb.

Body Cover Removal

Steps for removing front, rear seats, and body covers.

Taillight Assembly Replacement

Procedure for removing and replacing the taillight assembly.

Main switch Inspection and Replacement

Inspection and replacement of the main switch.

Handlebar Switches

Checking and replacing right handlebar switches.

Left Handle Switch

Checking and replacing left handlebar switches.

Brake light switch

Checking continuity of brake light switches.

Horn Maintenance

Removal, testing, and replacement of the horn.

Fuel unit

Removal, connection, and resistance measurement of the fuel unit.

Emission Control

Emission Control System Mechanism

Overview of the emission control system mechanism.

Fuel Evaporative Emission Control System (E.E.C.)

Construction, operation, and troubleshooting of the EEC system.

Evaporative Emission Control System (E.E.C.) Inspection

Visual check and purge control valve function test.

Catalytic converter (C.A.T.A.)

Construction and description of the catalytic converter.

Positive Crankcase Ventilation System (P.C.V.)

Construction, principle of operation, and service method of the PCV system.

Air injection solenoid valve(AISV)

Description and operating conditions of the AISV.

Ignition system

Principle of the ignition system.

Inspection items

Checks for evaporative emission, catalytic converter, fuel, and ignition systems.

Countermeasure for abnormal emission pollutants

Flowchart for addressing abnormal emission pollutants.

Wiring diagram

Wiring Diagram

Schematic of the vehicle's electrical wiring.

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