Category:
Dual-purpose / Trail Motorcycle
Target Audience:
Enthusiasts and owners seeking to maintain, repair, or restore their vintage Yamaha Enduro motorcycles.
Competitors Era:
Honda SL series, Suzuki TS series, Kawasaki F series
Vehicle Appeal:
Rugged design, reliable two-stroke engines, capable off-road performance, lightweight for their class.
Manual Value Proposition:
Provides essential technical data for keeping these classic machines running optimally, crucial for preserving their value and functionality.
Engine Systems:
Top-end (cylinder, piston, rings), Bottom-end (crankshaft, connecting rod, bearings), Carburetion, Ignition system (points, coil, timing), Lubrication system, Cooling system (air-cooled specific considerations)
Transmission Drivetrain:
Clutch operation and adjustment, Gearbox internal components and servicing, Shift mechanism, Final drive (chain maintenance, sprockets)
Chassis Suspension:
Front forks (oil changes, seal replacement, spring specifications), Rear shock absorbers (rebuild, adjustment), Swingarm lubrication and bearing service, Frame inspection and repair considerations
Brakes:
Drum brake system overhaul (shoe replacement, drum cleaning, linkage adjustment), Brake cable maintenance and adjustment
Electrical System:
Wiring diagrams, Lighting system (headlight, taillight, indicators), Horn operation, Battery maintenance and specifications, Charging system (magneto/alternator output)
Fuel System:
Fuel tank servicing, Fuel lines, Fuel petcock operation and repair, Carburetor disassembly, cleaning, adjustment, and jetting specifications
Controls:
Throttle cable adjustment, Clutch cable adjustment, Brake lever and pedal adjustment, Handlebar and control lever replacement
Bodywork Trim:
Fender removal and installation, Seat removal and maintenance, Fuel tank mounting and removal, Side cover removal and installation
Maintenance Procedures:
Regular service checks, Oil changes and filter replacements (if applicable), Spark plug inspection and replacement, Air filter cleaning and replacement, Chain lubrication and adjustment, Tire pressure checks, General cleaning and lubrication
Repair Procedures:
Engine top-end rebuild (piston, rings, cylinder), Carburetor overhaul and tuning, Fork seal replacement, Brake shoe replacement, Cable replacement, Basic electrical troubleshooting and component replacement
Troubleshooting Guides:
Diagnostic flowcharts for common running issues (e.g., hard starting, poor performance), Electrical system fault finding, Carburetion problems and solutions
Disassembly Reassembly:
Step-by-step instructions for major component removal and installation, Detailed diagrams for complex assemblies
Depth:
Comprehensive factory-level detail, suitable for both home mechanics and professional technicians. Covers routine maintenance, diagnostics, repairs, and overhauls.
Engine Type:
Two-stroke, air-cooled
Cylinder Configuration:
Single-cylinder
Displacement 100Cc:
Approx. 97cc
Displacement 175Cc:
Approx. 171cc
Horsepower 100Cc Approx:
10-12 HP (varies by specific model variant and tuning)
Horsepower 175Cc Approx:
15-18 HP (varies by specific model variant and tuning)
Carburetor Type:
Mikuni (common), Keihin (possible)
Fuel Type:
Unleaded gasoline with two-stroke oil mixture (e.g., 20:1 or 25:1, refer to manual for exact ratio)
Fuel Delivery:
Carburetor, gravity feed from fuel tank
Ignition System:
CDI (Capacitor Discharge Ignition) or Magneto with points and condenser
Spark Plug Type Example:
NGK B8ES (example, consult manual for specific type and gap)
Wheelbase Approx 100:
Approx. 1240 mm (48.8 inches)
Wheelbase Approx 175:
Approx. 1300 mm (51.2 inches)
Ground Clearance Approx:
Approx. 250 mm (9.8 inches)
Dry Weight Approx 100:
Approx. 95 kg (209 lbs)
Dry Weight Approx 175:
Approx. 105 kg (231 lbs)
Fuel Tank Capacity Approx:
Approx. 7.0 Liters (1.8 US gal)
Front Tire Size Example:
2.75-21 or 3.00-21 (consult manual)
Rear Tire Size Example:
4.00-18 or 4.10-18 (consult manual)
Oil Change Engine:
2-stroke: Refer to manual for fuel/oil mix ratio. Gearbox oil change: Every 3,000-5,000 km (refer to manual).
Spark Plug Inspection:
Every 1,000-2,000 km or annually.
Air Filter Cleaning:
Every 500-1,000 km, depending on riding conditions.
Chain Lubrication:
Every 300-500 km and after riding in wet conditions.
Two Stroke Oil Mix:
Yamalube 2-Stroke or high-quality JASO FD rated oil. Mixture ratio as specified in manual (e.g., 20:1, 25:1).
Gearbox Oil Type:
Yamalube Gear Oil (GL-4) or equivalent API classification, viscosity SAE 80W-90 or 10W-30 (check manual for exact spec).
Fork Oil Type:
Yamaha Fork Oil (specific grade) or equivalent SAE 10W (check manual for exact grade and quantity).
Common Wear Items:
Piston rings, clutch plates, carburetor jets, fork seals, wheel bearings, drive chain and sprockets.
Two Stroke Considerations:
Carbon buildup in the combustion chamber and exhaust port, requiring periodic cleaning. Proper fuel/oil mixture is critical to prevent engine seizure.
Electrical Aging:
Wiring harness degradation, stator output reduction, and aging CDI units can cause ignition issues.
Yamaha Motorcycles:
Yamaha has a long and successful history in motorcycle manufacturing, known for innovation in both two-stroke and four-stroke engines, racing success, and a wide range of models.
Enduro Lineage:
The Enduro series represented Yamaha's push into the popular dual-purpose and off-road market during the late 1960s and early 1970s, competing with other Japanese manufacturers.
Key Innovations Era:
Yamaha was instrumental in refining two-stroke technology for reliability and performance, with features like reed valve induction becoming more common.
Manufacturing Location:
Japan
