Naked Motorcycles
1990MuZ ETZ 251
18 fields on record
The MuZ ETZ 251 is a lightweight classic two-stroke single suited to commuters and novice riders seeking affordable, reliable transport. Known for its simplicity and fuel efficiency, this air-cooled machine delivers modest performance with a 129 km/h top speed, making it ideal for urban riding and everyday practicality rather than spirited adventures.
- Capacity
- 243.0 ccm
- Engine
- Single, two-stroke
- Gearbox
- 5-speed
- Wet weight
- 146.0 kg
- Seat height
- Not on record
Know it? Add it → - Power
- 21.0 HP (15.4 kW) @ 5500 RPM
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Best suited to relaxed commuting, light utility riding, and nostalgic classic-bike enjoyment rather than performance riding.
- Built for
- An honest, no-frills two-stroke single with old-school charm and modest, predictable performance.
- Not ideal for
- Not for riders seeking speed, modern refinement, or serious highway touring capability.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Engine
- Capacity
- 243.0 ccm
- Power
- 21.0 HP (15.4 kW) @ 5500 RPM
- Engine type
- Single, two-stroke
- Power/weight ratio
- 0.1438 HP/kg (wet)
- Bore x stroke
- 69.0 x 65.0 mm
- Compression
- 10.0:1
- Cooling system
- Air
- Torque
- Not on record - add it
Transmission
- Gearbox
- 5-speed
- Transmission type
- Manual
- Final drive
- Chain
Performance
- Top speed
- 129.0 km/h (80.2 mph)
Dimensions & weight
Brakes & wheels
- Front brakes
- Single disc
- Rear brakes
- Expanding brake
- Front tyre
- 2.15-18
- Rear tyre
- 110/80-16
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 | 1989 | 1990 | 1991 | 1992 |
|---|---|---|---|---|
| Capacity | 243 cc | 243 cc | 243 cc | 243 cc |
| Fuel capacity | 17 L | 17 L | 17 L | 17 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 MuZ ETZ 251?
The 1990 MuZ ETZ 251 has a Capacity of 243.0 ccm (14.83 cubic inches).
What engine power does the MuZ ETZ 251 have?
The 1990 MuZ ETZ 251 has a Power of 21.0 HP (15.4 kW) @ 5500 RPM.
How many gears does the MuZ ETZ 251 have?
The 1990 MuZ ETZ 251 has a Gearbox of 5-speed.
How much does the MuZ ETZ 251 weigh?
The 1990 MuZ ETZ 251 has a Wet weight of 146.0 kg (321.9 pounds).
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