Key performance

10 ch
Power
🔧
119 cc
Displacement
⚖️
94 kg
Weight
🏎️
116 km/h
Top speed
10.5 L
Fuel capacity
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Technical specifications

Engine

Displacement
119 cc
Power
10.0 ch @ 9000 tr/min (7.3 kW)
Engine type
Single cylinder, two-stroke
Cooling
Air
Compression ratio
12.0:1
Bore × stroke
54.2 x 51.5 mm (2.1 x 2.0 inches)
Valve timing
Port control

Chassis

Gearbox
6-speed
Final drive
Chain   (final drive)

Brakes

Front brakes
Single disc
Rear brakes
Single disc
Front tyre
2.50-18
Rear tyre
2.75-18

Dimensions

Fuel capacity
10.50 L
Weight
94.00 kg

Overview

Spain in the 1980s, undergoing a major overhaul of its motorcycle industry, produced some stubborn curiosities. The Bultaco Streaker 125 is one of them, a concentrate of anachronisms that could only have been born there and at that time. Here, touring is practiced without compromise, on the tip of a gritty two-stroke, with only a ten and a half-liter tank as baggage. A philosophy more than a specification.

Bultaco Streaker 125

Its 119 cc two-stroke single-cylinder engine breathes at a compression ratio of 12:1 and delivers a little over ten horsepower at 9000 rpm. The figures lack brilliance, but they hide the essential: a square architecture, with a bore of 54.2 mm slightly greater than the stroke of 51.5 mm, typical of an engine designed for responsiveness rather than revs. Coupled with a six-speed gearbox, this small block demands to be worked, sounding the call of secondary roads where its 116 km/h top speed finds meaning. Air cooling and carburetor fuel delivery complete a mechanical picture of radical simplicity.

With an announced weight of 94 kilograms fully fueled, the Streaker defies the laws of physics of touring. This figure, closer to a trial bike than a road bike, explains everything. Handling must be instantaneous, almost nervous, and the 18-inch tires, a dimension from another age, ensure a frank contact with the road surface. Braking, provided by a single disc on each wheel, was probably sufficient for a machine that prioritized lightness over pure power.

It was aimed at the minimalist globetrotter, the one for whom the journey begins with stripping down. A rider seeking the essence of movement, ready to accept the vibrations of a two-stroke, the meticulous maintenance of a chain drive, and frequent stops for refueling. Faced with the Japanese four-strokes that were beginning to dominate the segment, Bultaco offered a raw sensory experience, a direct dialogue with mechanics. One didn’t buy a Streaker for its comfort, but for its character.

Today, it exists mainly in the imagination of collectors of defunct brands, like a last breath of pre-decline Bultaco. It recalls an era when touring could be a light, frugal, and demanding adventure, far from fairings and integrated luggage. A motorcycle for purists, with a dry sense of humor and an undeniably retro charm.

Indicators & positioning

Weight-to-power ratio
0.11 ch/kg
🔧
Volumetric power
84.0 ch/L
In category Touring · 60-238cc displacement (52 motorcycles compared)
Power 10 ch Top 58%
8 ch median 11 ch 17 ch
Weight 94 kg Lighter than 100%
94 kg median 125 kg 133 kg
P/W ratio 0.11 ch/kg Top 13%
0.07 median 0.09 0.11 ch/kg

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