Simson THUNDER BIRD 50 (SIMSON-SULA) (1999) — Specs
Identity
Manufacturer: Simson
Model: THUNDER BIRD 50 (SIMSON-SULA)
Category: Scooter
Type: Scooter
Years: 1999 →
Engine
Displacement (cc): 50
Cylinders: 1
Power (hp): 5
Power (kW): 3.7
Dimensions
Overall length: 1900 mm
Overall width: 730 mm
Overall height: 1170 mm
Wheelbase: 1335 mm
Ground clearance: 125 mm
Weight (kg): 77
Tank (L): 6
Tires
Front tire: 100/80-14
Rear tire: 120/70-14
Drivetrain
Transmission: CVT
Fluids & Filters
Oil filter: OEM oil filter
Brake fluid: DOT 4
Fuel consumption
Estimated range: ~240 km on a full tank (6.0 L)
Service
Service interval (km): 3000
Service interval (months): 12
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 3,000 km or 12 months, whichever comes first. Brake fluid: DOT 4. Drive: CVT. Tire size: front 100/80-14, rear 120/70-14. 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
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
Spark plug
Front brake pads
Rear brake pads
Front tire
Spec: 100/80-14
- OEM OEM 100/80-14
Rear tire
Spec: 120/70-14
- OEM OEM 120/70-14
Brake fluid
Spec: DOT 4
Coolant
Service interval
Spec: 3 000 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
- OEM 2-stroke engine — no valve check needed
Suspension
Spec: telescopic fork
- OEM Fork: telescopic fork
Air filter
Battery
- Premium Yuasa YTX5L-BS or YT4B-BS (typical 50-125cc)
