Scooters
1991Tomos BT
20 fields on record
The 1991 Tomos BT is a lightweight 49cc sport moped ideal for novice riders and urban commuters seeking affordable, nimble transportation. Powered by a spirited two-stroke single-cylinder engine producing 5.36 horsepower, it delivers genuine performance for its class with a top speed of 90 km/h. Known for its responsive handling and reliability, the BT represents the pinnacle of accessible two-stroke sport mopeds.
- Capacity
- 49.0 ccm
- Engine
- Single, two-stroke
- Gearbox
- 5-speed
- Dry weight
- 70.0 kg
- Seat height
- Not on record
Know it? Add it → - Power
- 5.4 HP (4.0 kW)
What’s new for the 1991 Tomos BT
vs the 1990| Spec | 1990 | 1991 |
|---|---|---|
| Engine capacity | 50.0 ccm (3.05 cubic inches) | 49.0 ccm (2.99 cubic inches) |
| Power | 6.0 HP (4.4 kW) | 5.4 HP (4.0 kW) |
| Torque | — | 5.0 Nm (0.5 kgf-m or 3.7 ft.lbs) @ 7500 RPM |
| Fuel capacity | 9.00 litres (2.38 US gallons) | 9.50 litres (2.51 US gallons) |
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built as a lightweight 49cc sport moped for short urban hops and cheap, nimble commuting rather than any kind of serious performance riding.
- Built for
- A fun, buzzy little two-stroke with a playful character that rewards revving it out rather than relying on outright power.
- Not ideal for
- Not suitable for highway travel, long-distance touring, carrying a passenger comfortably, or anyone seeking real speed and power.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Engine
- Capacity
- 49.0 ccm
- Power
- 5.4 HP (4.0 kW)
- Torque
- 5.0 Nm (0.5 kgf-m) @ 7500 RPM
- Engine type
- Single, two-stroke
- Power/weight ratio
- 0.0771 HP/kg (dry)
- Bore x stroke
- 38.0 x 43.0 mm
- Compression
- 11.0:1
- Cooling system
- Air
- Fuel system
- Carburettor
- Starting
- Kick
Transmission
- Gearbox
- 5-speed
- Transmission type
- Manual
- Final drive
- Chain
Performance
- Top speed
- 90.0 km/h (55.9 mph)
Dimensions & weight
- Dry weight
- 70.0 kg
- Fuel capacity
- 9.50 litres
- Seat height
- Not on record - add it
Brakes & wheels
- Front brakes
- Single disc
- Front brakes diameter
- 220 mm
- Rear brakes
- Expanding brake (drum brake)
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
What changed, year to year
Differences highlighted| Specification | 1990 | 1991 |
|---|---|---|
| Capacity | 50 cc | 49 cc |
| Dry weight | 70 kg | 70 kg |
| Fuel capacity | 9 L | 9.5 L |
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
Rider Reviews
Common questions
What is the engine size of the Tomos BT?
The 1991 Tomos BT has a Capacity of 49.0 ccm (2.99 cubic inches).
What engine power does the Tomos BT have?
The 1991 Tomos BT has a Power of 5.4 HP (4.0 kW).
How many gears does the Tomos BT have?
The 1991 Tomos BT has a Gearbox of 5-speed.
What is the torque of the Tomos BT?
The 1991 Tomos BT has a Torque of 5.0 Nm (0.5 kgf-m or 3.7 ft.lbs) @ 7500 RPM.
How much does the Tomos BT weigh?
The 1991 Tomos BT has a Dry weight of 70.0 kg (154.3 pounds).
Shop this bike
Affiliate linksWe may earn a commission from qualifying eBay or Amazon purchases made through these links. As an Amazon Associate I earn from qualifying purchases.
Please log in or register if you'd like to leave a comment.
Own one? Add it to My Garage and write an owner review with an Owner badge.