Target Audience:
Yamaha GPX338F owners, mechanics, collectors
Key Benefit:
Empowers owners to perform maintenance and repairs independently, saving time and money.
Quality Assurance:
Guaranteed great quality service manual with excellent customer service support.
Manual Objective:
To provide a comprehensive guide for maintaining and repairing the Yamaha GPX338F, enabling users to understand and fix their machine.
Systems Covered:
Engine, Transmission, Chassis, Electrical System, Fuel System, Cooling System, Ignition System, Brakes, Suspension, Wheels and Tires, Bodywork, Frame
Procedures Included:
Routine Maintenance, Troubleshooting, Diagnostics, Complete Repair, Disassembly, Reassembly, Overhaul, Adjustments, Component Replacement, Wiring Diagrams
Technical Depth:
Comprehensive (from basic oil changes to major component swaps and rebuilds)
Illustrations And Diagrams:
Hundreds of illustrations to aid in repair procedures
Searchability:
Searchable PDF functionality
Printability:
Printable pages
Electrical System Details:
Complete wiring diagrams, component testing, troubleshooting guide for electrical faults.
Engine Rebuild:
Detailed instructions for engine disassembly, inspection, measurement of wear, component replacement, and reassembly.
Chassis And Suspension:
Information on front fork maintenance, rear shock absorber servicing, steering head bearing adjustment, and frame inspection.
Brake System Maintenance:
Service procedures for brake caliper/drum overhaul, fluid replacement, and adjustment.
๐ Manual Specifications
Search Functionality:
Enabled
Text Layer:
Present (allowing for text selection and searching)
Print Quality:
High-resolution scans for clear text and diagrams
Learning Curve:
Designed for owner use, step-by-step guidance for factory-trained technician knowledge
Navigation:
Hyperlinked table of contents for easy navigation within the PDF.
โ๏ธ Engine Specifications
Engine Type:
Air-cooled, 2-stroke, Parallel Twin (Inferred from 'GPX338F' nomenclature: GPX often indicates performance/racing, 338F likely displacement and configuration)
Displacement:
Approximately 338cc (Inferred from '338' in model name)
Bore X Stroke:
Specific data requires manual consultation, but typical for period 2-strokes
Compression Ratio:
Specific data requires manual consultation
Carburetion:
Dual Carburetors (Likely, for a parallel twin of this era and designation)
Fuel Type:
Unleaded gasoline with 2-stroke oil mixture (Specific ratio to be detailed in manual)
Ignition Type:
CDI (Capacitor Discharge Ignition) or Points Ignition (Likely for 1974 model year, manual will specify)
Lubrication System:
Premix (for 2-stroke) or Oil Injection System (Manual will specify)
Horsepower:
Estimate: 25-35 HP (Typical for 338cc air-cooled 2-stroke parallel twin of that era, precise figure in manual)
Torque:
Estimate: 20-28 ft-lbs (Estimate, precise figure in manual)
Transmission Type:
Manual, Sequential Gearbox (Likely 5 or 6-speed for a sports model of this era)
Clutch Type:
Wet Multi-Plate Clutch (Standard for Japanese motorcycles of this type)
Final Drive:
Chain Drive (Standard for this class of motorcycle)
Transmission Fluid:
Specific API GL-4 or GL-5 gear oil (Manual will specify grade and capacity)
Wheelbase:
Specific dimensions require manual consultation
Length:
Specific dimensions require manual consultation
Width:
Specific dimensions require manual consultation
Height:
Specific dimensions require manual consultation
Dry Weight:
Estimate: 300-350 lbs (Typical for a 338cc sport bike of the era, precise figure in manual)
Gross Vehicle Weight Rating:
Specific GVWR requires manual consultation
Front Brake:
Disc Brake or Drum Brake (Manual will specify, likely a single disc for performance models)
Rear Brake:
Drum Brake (Most common for rear of this era, manual will confirm)
Front Tire Size:
Specific size requires manual consultation (e.g., 3.00-18 or 90/90-18)
Rear Tire Size:
Specific size requires manual consultation (e.g., 3.50-18 or 100/90-18)
Wheel Type:
Spoked Wheels (Typical for 1974, manual will confirm spoke count and rim size)
Oil Change Interval:
Refer to manual for specific intervals, typically every few thousand miles or annually for gearbox oil. Premix ratio critical.
Spark Plug Replacement:
Refer to manual for specific intervals, typically every 5,000-7,500 miles or as needed based on condition.
Chain Lubrication And Adjustment:
Frequent, every 500-1000 miles or after washing/rain.
Engine Oil Type:
For gearbox: API GL-4 or GL-5 gear oil (Manual to specify viscosity, e.g., 10W-30 or 20W-40). For premix: Specific 2-stroke oil meeting Yamaha's recommendations.
Coolant Type:
Not applicable (Air-cooled engine)
Gearbox Oil Capacity:
Specific capacity requires manual consultation (typically 1-2 liters)
Common Wear Items:
Piston rings, crank seals, clutch plates, exhaust gaskets, carburation tuning due to age and fuel variations.
Electrical Issues:
Aging wiring harnesses, stator or rectifier failures, spark plug fouling.
Diagnostic Approach:
Systematic troubleshooting guides for starting issues, poor running, electrical faults, etc.
Brand Origin:
Yamaha Motor Company, Japan
Brand Focus:
Renowned for motorcycles, musical instruments, and marine products.
Segment:
Sport Motorcycle (Inferred from 'GPX' designation)
Era:
Mid-1970s performance era, characterized by increasing engine sizes and technological advancements in 2-stroke and early 4-stroke engines.
Production Period:
Model specific to 1974, likely part of a broader model range from the mid to late 1970s.
