As one of Southeast Asia's most popular underbone motorcycles, the Yamaha LC135 demands proper part knowledge for optimal performance. Whether you're a daily commuter or weekend racer, understanding these seven essential components will transform your riding experience and maintenance routine.

1. Engine Components: The Power Core
The 135cc SOHC engine requires particular attention to three vital elements:

Piston Kit (5TL-11630-00-00): This 54mm diameter component handles compression ratios up to 11:1. Watch for carbon buildup on piston crowns during routine checks.
Camshaft (3C1-12171-00): Responsible for valve timing accuracy. Measure lobe height regularly - wear beyond 33.85mm indicates replacement need.
Crankshaft Assembly (4C8-11400-02): Check connecting rod play every 5,000 km. Maximum allowable side play: 0.35mm

2. Transmission System: Power Delivery Experts
LC135's 5-speed constant mesh transmission features:

Clutch Plates (1P4-16321-00) - Replace when thickness drops below 2.8mm
Drive Chain (DID520VX3) - Maintain 25-35mm slack for optimal performance
Gear Shift Mechanism - Annual inspection recommended for shift forks and drum

3. Fuel System Components
The 26mm Mikuni carburetor demands attention to:

Main jet (#112.5 standard)
Float valve assembly
Throttle position sensor
Pro Tip: Clean fuel filters every 3,000 km to prevent clogging

4. Electrical System Essentials
Key electrical components include:

Stator Coil (3C1-85510-00) - Test resistance: 0.1-1.0Ω at 20°C
CDI Unit (3C1-85540-00) - Check for consistent spark advance curves
Battery (YTZ5V) - Maintain voltage between 12.4V-13.2V

5. Suspension Components
The LC135's suspension setup requires monitoring of:

Front fork oil (15W viscosity recommended)
Rear monoshock preload settings
Swingarm bushings (inspect every 10,000 km)

6. Braking System Parts
Safety-critical components include:

Front brake master cylinder (10.5mm piston diameter)
Brake pads (replace when thickness <1mm)
Brake hose condition (check for cracks biannually)

7. Body & Frame Components
Often overlooked but crucial elements:

Fuel tank breather hose
Engine mounting bolts (35Nm torque specification)
Fairing mounting clips (replace worn clips to prevent vibration)

Maintenance Pro Tips

Use Yamalube 20W-40 oil for best engine protection
Replace air filter every 8,000 km in urban conditions
Check valve clearance every 12,000 km (0.08mm intake/0.10mm exhaust)

Upgrade Recommendations
Popular performance enhancements:

High-lift camshafts (0.5mm increase for better mid-range)
Racing clutch springs
Aftermarket exhaust systems (ensure proper JASMA certification)

FAQ Section
Q: How often should I replace LC135 engine oil?
A: Every 2,500 km for mineral oil, 4,000 km for synthetic blends

Q: Where to find genuine Yamaha LC135 parts?
A: Always purchase from authorized dealers (Part numbers begin with 3C1/5TL)

Q: What's the average lifespan of LC135 piston rings?
A: 25,000-35,000 km depending on maintenance quality

By mastering these seven LC135 motorcycle parts and following our maintenance guidelines, you'll ensure peak performance from your Yamaha workhorse. Regular inspections using our technical specifications will prevent costly repairs and keep your ride smooth for years to come.