Market Segment:
Lightweight, entry-level scooter designed for urban commuting and recreational use.
Competitors:
Competed with other 50cc scooters from manufacturers like Honda (Dio, Elite), Suzuki (Lets), and Kymco during the era.
Key Features:
Compact size, ease of operation, fuel efficiency, low cost of ownership, reliable 2-stroke engine.
Coverage Scope:
Comprehensive service, repair, and maintenance for the 1990 Yamaha Razz scooter.
Page Count:
Information not explicitly provided in product description; typical for this era's manuals would be 200-400 pages.
Manual Type:
Service Manual / Repair Manual
Format:
Likely printed format, potentially available as PDF for digital sale.
Engine Systems:
Engine teardown, assembly, tuning, lubrication, cooling system, fuel system (carburetor), ignition system, exhaust system.
Transmission Systems:
Automatic transmission (CVT), drive belt inspection and replacement, clutch operation, gearbox lubrication.
Chassis Systems:
Frame, suspension (front fork, rear shock absorber), steering system, wheel bearings.
Electrical Systems:
Lighting system (headlight, taillight, turn signals), battery, charging system (stator, regulator/rectifier), starter system, wiring diagrams.
Braking Systems:
Front and rear brake system inspection, adjustment, pad replacement, fluid replacement (if applicable).
Bodywork And Fittings:
Body panel removal and installation, seat, storage compartment, handlebar components.
Maintenance Procedures:
Routine maintenance checks, oil changes, spark plug replacement, air filter cleaning/replacement, brake adjustments, drive belt inspection, tire pressure checks.
Repair Procedures:
Detailed step-by-step instructions for engine rebuilding, carburetor overhaul, transmission service, suspension repair, electrical component replacement.
Troubleshooting:
Diagnostic charts and procedures for identifying and resolving common mechanical and electrical issues.
Technical Depth:
Covers everything from basic rider-level maintenance to advanced diagnostics and component-level repairs, suitable for both home mechanics and professional technicians.
File Format:
Assuming digital format is PDF; print quality would depend on the source material.
Print Quality:
High-resolution scans of original factory manuals ensuring clarity of diagrams and text.
Binding Type:
N/A (for digital), typically saddle-stitched or perfect bound for physical copies.
Paper Type:
N/A (for digital), original manuals typically printed on durable, coated paper.
Engine Type:
2-stroke, air-cooled
Bore X Stroke:
39.0 mm x 41.4 mm (typical for 49cc 2-stroke scooter engines)
Compression Ratio:
Approx. 7.0:1 (typical for this engine type)
Horsepower:
Approx. 5.3 HP @ 7000 RPM (estimated for the era and displacement)
Torque:
Approx. 4.0 lb-ft @ 6000 RPM (estimated)
Carburetor Model:
Mikuni VM12 (or similar small capacity carb) - specific model will be detailed in manual.
Fuel Type:
Unleaded gasoline
Fuel Mixture:
Pre-mix (typically 50:1 ratio with 2-stroke oil), or oil injection system - manual will clarify.
Ignition Type:
CDI (Capacitor Discharge Ignition)
Transmission Type:
Automatic (Continuously Variable Transmission - CVT)
Clutch Type:
Automatic centrifugal clutch
Drive Belt Details:
Belt drive, requiring periodic inspection and replacement based on mileage/wear.
Gear Reduction:
Single-speed reduction gear with automatic ratio adjustment via CVT.
Overall Length:
Approx. 1695 mm (66.7 in) - typical for this class.
Overall Width:
Approx. 670 mm (26.4 in) - typical for this class.
Overall Height:
Approx. 1050 mm (41.3 in) - typical for this class.
Dry Weight:
Approx. 67 kg (148 lbs) - typical for this class.
Gross Vehicle Weight Rating:
Approx. 215 kg (474 lbs) - typical for this class.
Fuel Tank Capacity:
Approx. 4.5 Liters (1.2 US gal) - typical for this class.
Front Tire Size:
3.00-10-4PR
Rear Tire Size:
3.00-10-4PR
Wheel Type:
Cast aluminum or steel wheels
Bolt Pattern:
N/A (typically hub-mounted for scooters)
Crash Safety:
Not applicable for this vehicle type/era in terms of automotive crash ratings.
Braking System:
Drum brakes front and rear.
Lighting:
Headlight, taillight, brake light, turn signals.
Mirrors:
Dual rear-view mirrors.
Infotainment Features:
Basic instrument cluster including speedometer, odometer, and indicator lights. No advanced infotainment systems.
Driver Assistance Systems:
None. Designed as a simple, mechanical vehicle.
Connectivity Features:
None. Primarily mechanical operation.
Oil Change Interval:
Every 1000-1500 km (or annually), refer to manual for precise specification and oil type.
Drive Belt Inspection:
Every 3000-5000 km, replacement as needed based on wear.
Spark Plug Replacement:
Every 4000-6000 km, or as per manual recommendation.
Engine Oil Type:
Yamalube 2-stroke oil (or equivalent high-quality 2-stroke oil meeting API TC, JASO FD standards).
Transmission Oil Type:
Yamaha Gear Oil (or equivalent SAE 80 GL-3/GL-4 hypoid gear oil) - manual will confirm specific viscosity.
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid (if hydraulic brakes are equipped, otherwise drum brake adjustment).
Common Wear Items:
Drive belt wear, carburetor jet clogging due to fuel degradation, electrical connector corrosion, worn suspension bushings.
Performance Degradation:
Loss of power and poor acceleration can indicate worn piston rings, clogged exhaust port, or faulty carburetor/reed valve assembly.
Brand Focus:
Yamaha is a well-established Japanese manufacturer known for motorcycles, musical instruments, and other powered products.
Scooter Lineage:
The Razz was part of Yamaha's entry into the burgeoning scooter market of the late 1980s and early 1990s, often competing with models like the Jog and Axis.
Production Period:
The Yamaha Razz was primarily produced in the late 1980s and early 1990s.
Manufacturing Location:
Likely manufactured in Japan or Southeast Asia (e.g., Taiwan, Indonesia) by Yamaha or its affiliates.
