JAWA 250 350 353 354 Service Repair Workshop Manual

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This manual covers the Jawa 250/350 Series motorcycles, specifically the 353 (250cc) and 354 (350cc) chassis codes and their variants. Produced from the early 1950s through the late 1960s, these...

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Typ: Motorcycle

Anbieter:

Art.-Nr: 129401

Stichworte: 250 350 353 354 Jawa Motorcycle Motorcycles

Produktvarianten

Beschreibung

This manual covers the Jawa 250/350 Series motorcycles, specifically the 353 (250cc) and 354 (350cc) chassis codes and their variants. Produced from the early 1950s through the late 1960s, these robust, air-cooled, two-stroke motorcycles from Czechoslovakia were renowned for their durability and practicality, serving as reliable workhorses across various global markets. Key features include their simple yet effective single-cylinder engine designs, 4-speed gearboxes, and sturdy chassis, embodying the engineering quality and straightforward functionality that defined Jawa motorcycles of the post-war era. This comprehensive Service Repair Workshop Manual provides detailed information for owners, mechanics, and restorers. Its scope encompasses complete service, repair, and workshop procedures, including essential maintenance, troubleshooting, rebuilding, and restoration guidance. The manual delves into all major systems, from the engine, transmission, and fuel system to the chassis, suspension, braking, and electrical components. It offers step-by-step instructions, diagnostic capabilities for common issues, and technical specifications, ensuring that users have the necessary resources to maintain and repair their Jawa 250/350 Series motorcycles effectively.

🏷️ Basic Information

Identification

Make:

Model:

250/350 Series

Specific Models Covered:

353, 354 (and variants within the 250cc and 350cc displacement classes)

Codes

Chassis Codes:

353 (250cc), 354 (350cc)

👋 Introduction

Market Position

Target Audience:

Jawa motorcycle owners, enthusiasts, mechanics, and restorers

Value Proposition:

Provides complete, high-quality information for self-repair and maintenance, avoiding inferior or incomplete alternatives

Key Features

Completeness:

Guaranteed no missing pages, comprehensive coverage for all models and aspects of the vehicle

User Friendliness:

Easy-to-use PDF format with a superb table of contents

Competitive Analysis

Comparison To Alternatives:

Positioned as superior to low-cost, incomplete manuals

📋 Manual Details

Coverage Areas

Primary Coverage:

Comprehensive service, repair, and workshop procedures

Secondary Coverage:

Maintenance, troubleshooting, rebuilding, refurbishment, restoration

Page Count

Estimated Pages:

Hundreds of pages (specific count not provided, but described as 'complete')

Manual Type

Type:

Service Repair Workshop Manual

Language

Language:

English (implied by product description context)

Format

Format:

PDF Download

File Format:

Searchability:

Searchable PDF text (common for quality digital manuals)

Printability:

Printable pages for workshop use

📖 Manual Coverage

Systems Covered

Engine:

Engine assembly, disassembly, inspection, tuning, lubrication, cooling, ignition, carburetor systems

Transmission:

Gearbox operation, maintenance, repair, clutch system

Chassis And Suspension:

Frame inspection, front fork assembly, rear shock absorber system, wheel bearings, steering components

Braking System:

Brake mechanisms (drum brakes for this era), linkage, adjustment

Electrical System:

Wiring diagrams, lighting, horn, ignition coil, battery maintenance, charging system (generator/alternator)

Fuel System:

Fuel tank, fuel lines, carburetor (specific models like Jikov or Amal are common)

Bodywork And Trim:

Fenders, fuel tank fitting, seat assembly, handle bar components, exhaust system

Procedures Included

Maintenance:

Regular servicing, lubrication points, decarbonizing, ignition timing adjustment, carburetor tuning

Troubleshooting:

Diagnosis of common problems related to starting, running, electrical issues, and performance

Repair And Rebuild:

Detailed step-by-step instructions for major component overhauls and replacements

Restoration:

Guidance for refurbishing and bringing the motorcycle back to original specifications

Technical Depth

Depth:

Comprehensive, covering everything from basic adjustments to full engine rebuilds and electrical system diagnostics

Diagnostic Capabilities:

Includes troubleshooting guides and common fault identification

Diagrams And Illustrations:

Likely includes exploded diagrams and line drawings for component identification and assembly

⚙️ Engine Specifications

Primary Engine

Engine Type:

2-stroke, air-cooled, single-cylinder (for both 250cc and 350cc variants)

Displacement:

Approximately 248cc (for 353) and 343cc (for 354)

Bore X Stroke:

Typical for 250cc: 66x72 mm; for 350cc: 70x74 mm (exact figures may vary slightly by sub-model and year)

Compression Ratio:

Typically around 6.5:1 to 7.5:1

Performance

Horsepower 250Cc:

Approximately 14-18 hp at 5000-5500 rpm

Horsepower 350Cc:

Approximately 17-21 hp at 4750-5250 rpm

Torque 250Cc:

Estimated 20-25 Nm

Torque 350Cc:

Estimated 25-30 Nm

Fuel System

Carburetor Type:

Single downdraft carburetor (e.g., Jikov, Amal, or similar)

Fuel Type:

Leaded or unleaded gasoline mixed with 2-stroke oil (typically 20:1 or 25:1 ratio)

Ignition System

Ignition Type:

Contact breaker points with coil ignition

🔧 Transmission

Standard

Transmission Type:

4-speed constant mesh gearbox

Clutch Type:

Wet multi-plate clutch

Gear Ratios:

Specific ratios would be detailed in the manual, varying slightly between models

Features

Operation:

Foot-operated gear shift (typically left side)

📐 Dimensions

Exterior

Wheelbase:

Approximately 1360-1390 mm (exact for specific models)

Overall Length:

Approximately 1900-2000 mm

Weights

Dry Weight:

Approximately 125-145 kg

🛡️ Safety Features

Ratings

Crash Safety:

Not applicable to period motorcycles in modern rating systems

Active Features

Braking Performance:

Drum brakes front and rear; performance is typical for drum brake systems of the era

Passive Features

Lighting:

Headlight, tail light, brake light, turn signals (depending on variant and market regulations)

💡 Technology Features

Infotainment

Features:

N/A (vintage motorcycle)

Driver Assistance

Features:

N/A (vintage motorcycle)

🔧 Maintenance

Service Intervals

Oil Change Interval:

Typically every 2000-3000 km or annually; gearbox oil change as per manual (e.g., 5000-10000 km)

Decarbonizing Interval:

Recommended every 5,000-10,000 km, or when performance degrades

Spark Plug Replacement:

Regular inspection and replacement as needed, typically every 3000-5000 km

Ignition Timing Check:

Periodically, especially if running issues arise

Fluid Specifications

2-Stroke Oil Mix:

Typically SAE 30 or SAE 40 2-stroke oil at 20:1 or 25:1 ratio (refer to manual for exact specification)

Gearbox Oil:

Typically SAE 80W or 80W-90 hypoid gear oil (check manual for specific type and quantity)

Fork Oil:

Specific viscosity SAE 10W or similar motorcycle fork oil (quantity specified per leg)

Known Issues

Common Problems:

Carburetor flooding/fouling, ignition timing drift, wear in gearbox dog teeth, vibration at higher RPMs, starter kick mechanism wear

Carburetor Tuning:

Requires careful adjustment of pilot jet, main jet, needle, and idle speed for optimal performance and fuel efficiency

Engine Sealing:

Potential for oil leaks at engine case joins and exhaust flanges

📚 Vehicle History

Brand Heritage

Manufacturer:

Jawa Motorcycles (Czechoslovakia)

Founding:

Founded in 1929

Model Evolution

Introduction Period:

The 353 and 354 models were developed in the post-WWII era, with production starting in the early 1950s.

Key Innovations:

Jawa was known for robust, practical motorcycles, often exported widely. The 250/350 series were workhorses.

Production

Production Years:

Generally from the early 1950s through the late 1960s, with various updates.

Manufacturing Location:

Týnec nad Sázavou, Czechoslovakia (now Czech Republic)

🏆 Awards & Recognition

Recognitions

Historical Reputation:

Jawa motorcycles of this era were respected for their durability and simplicity, making them popular in many global markets.