Yamaha LB 50 2M CHAPPY (1976–1983) — Specs
Identity
Manufacturer: Yamaha
Model: LB 50 2M CHAPPY
Category: Motorcycle
Type: Motorcycle
Years: 1976 → 1983
Engine
Displacement (cc): 49
Cylinders: 1
Power (hp): 2.8
Power (kW): 2.1
Dimensions
Overall length: 1830 mm
Overall width: 700 mm
Overall height: 1090 mm
Wheelbase: 1290 mm
Ground clearance: 115 mm
Tank (L): 2
Tires
Front pressure (bar): 1.5
Rear pressure (bar): 2.5
Drivetrain
Drive chain: 90 links
Sprockets (front / rear): 14 / 33
Ignition
Spark plug: NGK B6HS
Plug gap: 0.7 mm
Fluids & Filters
Oil filter: OEM oil filter
Air filter: OEM air filter
Fuel consumption
Estimated range: ~80 km on a full tank (2.0 L)
Service
Battery: OEM battery specification
Service interval (km): 6000
Service interval (months): 12
Valve check (km): 12000
Parts and consumables for this motorcycle
Data is gathered with care, but without guarantee. Always confirm critical information with your dealer or workshop.
Service notes
Service interval: every 6,000 km or 12 months, whichever comes first. Valve clearance check every 12,000 km. Valve clearance — intake -, exhaust -. Spark plug: NGK B6HS (gap 0.7 mm). Chain: 90 links, sprockets 14/33 teeth. Tire pressure: front 1.5 bar, rear 2.5 bar (cold). Always confirm critical values with the workshop manual or an authorised dealer.
OEM and quality aftermarket parts that fit this bike. Always confirm with your dealer before ordering.
Engine oil
- OEM OEM recommended engine oil
- Premium Motul 7100
- Premium Motul 5100
Which Motul for this bike?
| Motul 7100 4T ✓ | Motul 5100 4T | |
|---|---|---|
| Product | Motul 7100 4T — 100% fully synthetic | Motul 5100 4T — semi-synthetic |
| Best for | Sport, Naked, Adventure (600cc+), track | Standard, Cruiser, Scooter, daily use |
| RPM protection | Excellent — ester base, stable under load | Good — for normal riding conditions |
- Standard Repsol Moto Racing 4T
- Standard Elf Moto 4 Tech
Fully Synthetic vs Semi-Synthetic
| Fully Synthetic | Semi-Synthetic | |
|---|---|---|
| Base oil | 100% chemical synthesis (ester or PAO) | Mineral oil + synthetic additives |
| Heat resistance | Excellent — stable at extreme heat & RPM | Good — suitable for normal temperatures |
| Cold start | Better — reaches engine faster when cold | Good — adequate for normal climates |
| Change interval | Longer (up to 10,000 km) | Shorter (5,000–7,000 km typical) |
| Price | Higher | Lower |
Oil filter
Air filter
Spark plug
Spec: NGK B6HS, gap 0.7 mm
- OEM NGK B6HS
- Premium NGK BR6HIX
- Standard NGK B6HS
Front brake pads
Rear brake pads
Drive chain
Spec: 90 links | Sprockets 14/33 teeth / 90 links
Front tire
Spec: 1.5 bar
Rear tire
Spec: 2.5 bar
Battery
- Premium Yuasa YTX5L-BS or YT4B-BS (typical 50-125cc)
Brake fluid
- Standard TotalEnergies HBF4
Coolant
Service interval
Spec: 6 000 km / 12 months
- OEM Engine oil + oil filter change
- OEM Air filter inspection
- OEM Spark plug check
- OEM Brake fluid replacement: every 2 years
Valve check
Spec: 12 000 km
- OEM Intake clearance: -
- OEM Exhaust clearance: -
Suspension
Spec: L.100 ml,R.124 ml
- OEM Fork oil grade: L.100 ml,R.124 ml
