Target Audience:
Owners, mechanics, and enthusiasts of the 1975 Suzuki RV125 dual-sport motorcycle.
Utility:
Essential reference for maintaining, repairing, and restoring the classic Suzuki RV125.
Competitors:
Other 125cc dual-sport/scrambler motorcycles of the mid-1970s, e.g., Yamaha DT125, Honda CR125 Elsinore.
Manual Advantage:
Factory-issued procedures ensure accuracy and completeness for all service tasks.
Historical Significance:
Provides insight into the engineering and maintenance practices of a popular mid-70s off-road/dual-sport machine.
Engine:
Complete disassembly, assembly, inspection, and repair procedures for the 125cc engine.
Fuel System:
Carburetor adjustment, cleaning, and overhaul; fuel tank and fuel line maintenance.
Ignition System:
Spark plug specifications, timing adjustments, and component testing.
Transmission:
Gearbox inspection, lubrication, and internal component servicing.
Clutch:
Clutch engagement, adjustment, and replacement procedures.
Frame And Suspension:
Front fork disassembly, seal replacement, oil levels; rear shock absorber servicing; frame inspection.
Brakes:
Drum brake adjustment, lining inspection, and cable maintenance.
Electrical System:
Wiring diagrams, lighting system checks, battery maintenance, and basic circuit troubleshooting.
Wheels And Tires:
Tire pressure recommendations, wheel bearing maintenance, and spoke tension checks.
Bodywork And Trim:
Removal and installation of body panels, fenders, and seat.
Routine Maintenance:
Oil changes, filter replacements, chain lubrication and adjustment, spark plug checks.
Troubleshooting Guides:
Diagnostic procedures for common starting, running, and performance issues.
Disassembly Assembly:
Step-by-step instructions for removing and reinstalling all major components.
Adjustment Procedures:
Carburetor, ignition timing, clutch, and brake lever adjustments.
Rebuilding Overhaul:
Detailed instructions for rebuilding the engine, carburetor, and other key units.
Lubrication Points:
Identification of all lubrication points and recommended lubricant types.
Scope:
Comprehensive, covering all aspects from basic adjustments to full engine rebuilds, suitable for both mechanics and experienced DIY users.
Engine Type:
Two-stroke, air-cooled
Displacement:
123 cc (7.5 cubic inches)
Bore X Stroke:
56.0 mm x 50.0 mm (2.20 in x 1.97 in)
Compression Ratio:
Approx. 7.0:1
Carburetion:
Single Mikuni VM24SS carburetor (typical)
Horsepower:
Approx. 11-13 hp at 7,500 rpm (estimated)
Torque:
Approx. 9-10 lb-ft (estimated)
Fuel Type:
Unleaded gasoline (recommend 87 octane or higher, mixed with 2-stroke oil)
Fuel Oil Ratio:
50:1 (typical for Suzuki two-strokes of this era, check manual for exact)
Fuel Tank Capacity:
Approx. 6.0 Liters (1.6 US gallons)
Safety Standards:
N/A (motorcycle safety standards were less formalized than automotive in 1975)
Braking System:
Front and rear drum brakes.
Lighting:
Headlight, taillight, brake light, turn signals (market dependent).
Frame Construction:
Steel frame, designed for off-road durability.
Infotainment System:
N/A (This is a 1975 motorcycle, no infotainment system present).
Driver Assistance Features:
N/A (No electronic driver assistance systems on this model).
Connectivity Features:
N/A (No connectivity features).
Oil Change Interval:
Every 1,000-1,500 miles or annually (check manual for precise interval and oil type).
Spark Plug Check:
Every 1,000 miles or annually.
Chain Lubrication:
Every 300-500 miles or after riding in wet conditions.
Carburetor Cleaning:
As needed, typically annually or if performance issues arise.
Engine Oil Type:
API Service Classification TCW-3 rated 2-stroke engine oil (or equivalent specified in the manual).
Transmission Oil Type:
Gear oil, SAE 80W-90 (or as specified in the manual).
Fork Oil Type:
Suzuki Special Fork Oil SS-8, or equivalent SAE 10W fork oil (check manual for quantity and grade).
Two Stroke Wear:
Piston ring wear, cylinder scoring, and exhaust port carbon buildup are common in high-mileage two-strokes.
Carburetor Clogging:
Mikuni carburetors can be susceptible to clogging from old fuel or debris if not properly maintained.
Electrical Connections:
Corrosion or looseness in electrical connectors can lead to intermittent lighting or ignition issues.
Chain And Sprockets:
Regular lubrication and adjustment are critical to prevent premature wear of the chain and sprockets.
Manufacturer Origin:
Japan
Suzuki Motorcycle History:
Suzuki has a long history of producing innovative and reliable motorcycles, from small commuters to high-performance sportbikes and off-road machines.
Rv Series Concept:
The RV series was known for its ruggedness and versatility, often featuring wider tires and a more upright riding position, making them suitable for light off-road use and general riding.
Rv125 Positioning:
Positioned as an accessible and capable dual-purpose machine, bridging the gap between pure trail bikes and street bikes.
Production Years:
The RV125 was produced in the mid-to-late 1970s, with 1975 being a specific model year within that range.
Manufacturing Location:
Japan
