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Yamaha SR250 User Manual

Yamaha SR250
34 pages
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Manual de Reparación
(en inglés)
Yamaha SR250

Table of Contents

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Yamaha SR250 Specifications

General IconGeneral
Displacement249cc
Compression Ratio9.5:1
Fuel SystemCarburetor
IgnitionCDI
Transmission5-speed
Final DriveChain
Front SuspensionTelescopic fork
Front BrakeSingle disc
Rear BrakeDrum
Front Tire3.00-18
Dry Weight137 kg
Engine TypeAir-cooled, 4-stroke, SOHC, 2-valve
Max Torque19 Nm (1.9 kg-m) @ 6, 500 rpm
Rear SuspensionDual shock absorbers
Fuel Capacity12 liters

Summary

Yamaha SR250 Repair Manual - General Information

Motorcycle Identification

Details on frame and engine serial number location and format.

External View of Motorcycle Components

Identifies key external components and labels on the motorcycle.

Special Tools for Maintenance

Lists specialized tools required for maintenance and repair procedures.

Chapter 2: Periodic Inspections and Adjustments Overview

Maintenance and Lubrication Chart

Overview table for maintenance intervals and lubrication tasks.

Engine Maintenance Procedures

Covers carburetor, air filter, and engine oil checks and adjustments.

Chassis Maintenance and Adjustments

Includes brake, wheel, tire, and chain maintenance procedures.

Suspension, Steering, and Electrical Checks

Details on fork, shock absorber, steering, ignition timing, and spark plug.

Chapter 2: Engine Specific Maintenance

Carburetor Adjustment

Idle speed setting, mixture, and throttle cable adjustment procedures.

Air Filter Cleaning and Maintenance

How to clean and maintain the air filter element.

Engine Oil Level and Replacement

Oil level measurement, capacity, and oil filter replacement.

Clutch Adjustment and Free Play

How to adjust clutch cable free play and mechanism.

Cam Chain Tension Adjustment

Steps to adjust the cam chain tension.

Valve Clearance Adjustment

Procedure for checking and adjusting valve clearances.

Chapter 2: Chassis Specific Maintenance

Fuel Petcock Inspection

Steps to drain fuel, remove petcock, and clean its filter.

Front Brake and Wheel Adjustments

Front brake lever free play adjustment.

Spoke and Axle Maintenance

Checking spoke tightness, rim runout, front axle torque.

Rear Brake Adjustments and Inspection

Adjusting rear brake pedal height, free play, and lining wear.

Drive Chain Tension and Lubrication

How to check drive chain tension and lubricate.

Front Fork Oil Change Procedure

Step-by-step guide to changing front fork oil.

Suspension, Steering, and Cable Lubrication

Adjusting steering head, checking suspension, and lubricating cables.

Rear Shock Absorber and Lever Lubrication

Adjusting rear shock absorber and lubricating levers/pedals.

Ignition Timing and Spark Plug Service

How to check ignition timing and service spark plugs.

Chapter 3: Engine Overhaul Procedures

Engine Removal Preparation

Steps for cleaning and preparing the engine for removal.

Component Removal: Fuel Tank, Exhaust, Wiring

Procedures for removing fuel tank, muffler, footrest, brake pedal, and wiring.

Engine and Drive Chain Removal

Steps to remove carburetor, drive chain, and engine mounting bolts.

Engine Disassembly: Cylinder Head and Cylinder

Steps to remove the cylinder head and cylinder assembly.

Engine Disassembly: Flywheel and Crankshaft

Procedures for removing flywheel magneto, cam chain, and head bolts.

Engine Disassembly: Piston, Crankcase Covers

Steps to remove piston pin, piston, and right crankcase cover.

Engine Disassembly: Clutch and Drive Gear

Steps to remove the clutch assembly and drive gear.

Engine Disassembly: Gears and Pumps

Procedures for removing clutch push lever, balance gear, oil pump, and shift shaft.

Engine Disassembly: Crankcase and Transmission

Steps to split crankcase, remove crankshaft, and transmission.

Engine Inspection: Cylinder Head and Rockers

Inspection and repair of cylinder head, rocker arms, and shafts.

Engine Inspection: Valves and Guides

Checking valve stems, seals, springs, guides, and seats.

Valve Seat Grinding and Piston Pin Check

Techniques for grinding valve seats and checking piston pin.

Crankshaft Inspection and Piston Rings

Checking crankshaft components and measuring piston ring end gap.

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