Target User:
Professional mechanics, technicians, and serious DIY enthusiasts.
Value Proposition:
Provides comprehensive factory-level repair and maintenance information for specific Yamaha snowmobile models.
Completeness:
Covers all aspects of repair, servicing, and troubleshooting, aiming for factory-level accuracy.
Visual Aids:
Extensive use of high-quality photos and diagrams to clarify procedures.
Model Years Covered:
1973, 1974, 1975
Model Variants Covered:
GPX338F, GPX433F
Estimated Page Count:
Hundreds of pages
Manual Type:
Factory Service Repair Workshop Manual
Format:
Digital Download (PDF)
Accessibility:
Downloadable to computer, tablet, or smartphone
Licensing:
Lifetime use, no expiry dates, no renewal fees
Compatibility:
Windows and MAC compatible
Print Capability:
Print single pages or entire manual
Device Usage:
Installable on multiple computers
Engine Overhaul:
Complete engine disassembly, inspection, repair, and reassembly procedures.
Fuel System:
Carburetor tuning, fuel pump operation, fuel lines, fuel tank maintenance.
Ignition System:
Spark plug specifications, ignition timing, coil testing, stator and magneto service.
Cooling System:
Air cooling system maintenance, fan and shroud inspection.
Drive System:
Clutch (primary and secondary) service, belt inspection and replacement, drive chain adjustment and lubrication.
Suspension:
Front suspension (likely leaf spring or trailing arm) inspection and repair, rear suspension (bogie wheel system) maintenance, shock absorber service.
Brakes:
Brake lever operation, brake band adjustment, brake cable inspection and replacement.
Skis And Track:
Ski wear inspection, track tension adjustment, track condition assessment.
Electrical System:
Headlight, taillight, and brake light circuits, handlebar controls, wiring harness inspection and repair.
Chassis And Bodywork:
Frame inspection, seat maintenance, handlebar mounting, cowling repair.
Troubleshooting:
Systematic diagnostic procedures for common and uncommon issues, fault finding charts.
Routine Maintenance:
Pre-ride inspections, lubrication points, chain adjustment, spark plug maintenance, air filter cleaning/replacement.
Component Replacement:
Step-by-step guides for replacing parts such as pistons, rings, clutches, suspension components, and electrical parts.
Rebuilds:
Detailed instructions for engine and clutch rebuilds.
Adjustments:
Carburetor, brake, clutch, and track adjustments.
Depth Of Information:
Professional level, covering all repairs, servicing, and troubleshooting.
Diagrams And Illustrations:
Hundreds of pages with detailed photos, diagrams, and exploded views.
Engine Displacement Gpx338F:
338cc (specific engine designation like air-cooled, 2-stroke, twin-cylinder is typical for this era but not explicitly stated in product info)
Engine Displacement Gpx433F:
433cc (specific engine designation like air-cooled, 2-stroke, twin-cylinder is typical for this era but not explicitly stated in product info)
Horsepower Estimate Gpx338F:
Typically in the range of 25-35 HP for this class and era, actual figures require manual consultation.
Horsepower Estimate Gpx433F:
Typically in the range of 30-45 HP for this class and era, actual figures require manual consultation.
Carburetion:
Likely single or dual Mikuni carburetors, specific models and jetting detailed in manual.
Cylinder Configuration:
Assumed Twin-Cylinder, 2-Stroke (standard for Yamaha performance snowmobiles of this period).
Cooling Method:
Air-Cooled (typical for Yamaha snowmobiles of this era).
Transmission Type:
CVT (Continuously Variable Transmission) system featuring a centrifugal clutch and a driven clutch.
Clutch Service:
Detailed procedures for primary clutch (e.g., weight adjustment, spring replacement) and secondary clutch (e.g., roller inspection, spring replacement, belt alignment).
Drive Belt:
Specifications for drive belt, inspection intervals, and replacement procedures.
Instrumentation:
Basic instrument cluster including speedometer, engine temperature warning light, and possibly an oil warning light.
Braking Assistance:
N/A (Basic mechanical braking system).
Electrical System Features:
Basic lighting system (headlight, taillight, brake light), ignition system, and kill switch functionality.
Oil Change Interval:
For 2-stroke engines, this typically involves ensuring the oil injection system is functioning correctly or proper pre-mix ratios are maintained. Specific interval for filter/pump checks is detailed.
Spark Plug Replacement:
Intervals typically range from 500 to 1000 miles, with specific plug types and gap settings provided.
Clutch Inspection:
Regular inspection of clutch sheaves, rollers, and drive belt for wear and damage, usually recommended annually or after a set number of operating hours.
Track Tension Adjustment:
Recommended to check and adjust track tension periodically, especially after initial break-in or heavy usage.
2 Stroke Oil Type:
Specific Yamaha 2M-C certified or equivalent high-quality 2-stroke snowmobile oil (e.g., Yamalube 2M), specific viscosity and type detailed in manual.
Chaincase Oil Type:
Specific gear oil or transmission fluid, typically SAE 80 or 90 gear oil, capacity and type specified.
Carburetor Fouling:
Common issue in older 2-stroke snowmobiles due to fuel quality and engine deposits; manual provides cleaning and tuning procedures.
Clutch Wear:
Sheave wear, roller damage, and spring fatigue can affect performance; manual covers inspection and replacement.
Track Tension Loss:
Can lead to poor traction and damage; manual outlines adjustment procedures.
Yamaha Snowmobile Division:
Yamaha Motor Corporation has a long history in snowmobile manufacturing, known for innovation and performance since its entry into the market.
Gpx Series Era:
The GPX series represented Yamaha's move towards more performance-oriented and sporty snowmobiles in the early to mid-1970s.
Production Period:
1973-1975 for the GPX338F and GPX433F models.
