Segment:
Lightweight Scooter / Moped
Target Audience:
Commuters, recreational riders, enthusiasts seeking detailed maintenance and repair knowledge.
Competitors 1995:
Honda Dio, Suzuki Address, Kawasaki KSR-II (though KSR-II is more off-road oriented).
Platform Strength:
Known for its nimble handling, fuel efficiency, and user-friendly operation, making it popular for urban transport.
Engine Overhaul:
Complete engine teardown, inspection, and reassembly procedures for all internal components (piston, rings, cylinder, crankshaft, bearings, seals).
Fuel System:
Carburetor disassembly, cleaning, adjustment, and troubleshooting; fuel tank, fuel line, and fuel filter maintenance.
Ignition System:
CDI unit testing, spark plug specifications, ignition coil resistance checks, stator and rotor inspection.
Cooling System:
Air cooling system analysis, fan belt inspection and adjustment, cylinder head cooling fins cleaning.
Transmission Drive:
Automatic transmission (CVT) component inspection, belt replacement, clutch assembly service, variator maintenance.
Suspension And Steering:
Front fork disassembly, seal replacement, oil level and type; rear shock absorber inspection and replacement; steering head bearing adjustment.
Braking System:
Front and rear brake pad replacement, brake shoe adjustment, brake cable lubrication and adjustment, brake fluid checks (if applicable for disc brakes).
Electrical System:
Wiring diagrams, lighting system troubleshooting (headlight, taillight, turn signals), battery maintenance, starter system diagnostics.
Frame And Bodywork:
Body panel removal and installation, seat removal, fairing component identification, chassis inspection.
Routine Maintenance:
Oil change intervals and specifications, air filter cleaning/replacement, spark plug replacement, drive belt inspection.
Troubleshooting Guide:
Diagnostic flowcharts for common starting issues, poor performance, unusual noises, and electrical problems.
Rebuild Procedures:
Detailed step-by-step instructions for engine rebuilds, carburetor overhauls, and transmission servicing.
Adjustment Procedures:
Carburetor idle speed and mixture adjustment, brake lever/pedal free play adjustment, throttle cable free play adjustment.
Component Replacement:
Instructions for replacing common wear items like brake pads, spark plugs, drive belts, tires, and bulbs.
Depth Level:
Comprehensive, covering everything from basic rider maintenance to full engine and transmission rebuilds, including electrical diagnostics.
Engine Type:
2-stroke, Air-cooled
Displacement:
49cc (specific to many JOG variants)
Bore X Stroke:
Approx. 39.0mm x 41.0mm (typical for 49cc 2-stroke)
Compression Ratio:
Approx. 7.0-7.5:1 (typical for this class)
Horsepower Est:
Approx. 5-6 HP @ 6500-7000 RPM
Torque Est:
Approx. 5-6 Nm @ 5500-6000 RPM
Carburetor Model Est:
Mikuni VM Series (e.g., VM12 or similar)
Fuel Type:
Unleaded gasoline (91 RON or higher recommended)
Oil Mixing:
Pre-mix or Auto-lube (requires 2-stroke engine oil for fuel mixing)
Crash Test Data:
N/A (As a scooter, does not undergo automotive crash testing standards)
Lighting:
Halogen headlight, taillight, brake light, front and rear turn signals.
Braking System Type:
Front drum brake, Rear drum brake (some variants might have front disc).
Frame Construction:
Underbone steel frame chassis.
Passenger Safety:
Passenger footpegs, grab handle.
Engine Oil Change:
Every 1,000 - 1,500 km or 6 months (for gearbox oil in CVT system).
Air Filter Cleaning:
Every 1,000 km, replace every 3,000 - 5,000 km.
Spark Plug Replacement:
Every 3,000 - 5,000 km (or as per manufacturer recommendation for specific plug).
Drive Belt Inspection:
Every 5,000 km, replace if worn or damaged (typically rated for 10,000 - 15,000 km).
Brake Pad Check:
Inspect every 2,000 km, replace when thickness reaches minimum service limit.
Transmission Oil Type:
Yamalube Gear Oil (GL-4, SAE 80 or 90) or equivalent.
2 Stroke Oil Type:
API TC certified 2-stroke motorcycle oil (e.g., Yamalube 2-Stroke Oil).
Brake Fluid Type:
DOT 3 or DOT 4 (if equipped with disc brakes).
Common Wear Items:
Drive belt degradation, carburetor gumming due to infrequent use, worn swingarm bushings, aging electrical connectors.
Starting Problems:
Can be attributed to fouled spark plugs, clogged carburetors, or weak ignition systems. The manual addresses these systematically.
Performance Decline:
Often linked to worn variator rollers, a stretched drive belt, or carburetor issues.
Yamaha Motor History:
Yamaha Motor Company, founded in 1955, has a strong heritage in motorcycles, musical instruments, and other motorized products.
Jog Lineage:
The Yamaha JOG (Jogging) line, introduced in the early 1980s, became one of Yamaha's most successful and enduring scooter platforms, spawning numerous iterations and displacements.
1995 Era Significance:
The 1995 models represent a refinement of the popular 2nd generation JOG, incorporating minor styling updates and performance improvements over earlier models.
Manufacturing Locations:
Primarily produced in Japan, with significant assembly also conducted in Southeast Asian countries for regional markets.
