The 2012 Polini X1R H2O is a liquid-cooled pocket bike from the Italian tuning specialist Polini. Its 49.3cc single drives the rear wheel by chain. A very low 600 mm seat and 43 kg dry weight make it ideal for children and minibike racing.
Editorial estimate from the spec sheet - not lab tested
Off-road & trail75%
Cornering80%
City riding15%
Daily riding10%
Touring5%
Two-up0%
Track65%
Best for
Built as a tiny high-revving two-stroke pit bike or minibike racer for closed circuits, garden tracks, and playful cross riding rather than any kind of road use.
Built for
A tiny, high-strung two-stroke go-kart on wheels that rewards aggressive body positioning, quick throttle inputs, and a playful, flickable riding style.
Not ideal for
It is not suitable for anyone wanting a comfortable, stable, or practical machine for daily commuting, road riding, or long-distance touring.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Full specifications
Engine
Capacity
49.3 ccm
Power
5.4 HP (4.0 kW)
Engine type
Single, four-stroke
Power/weight ratio
0.1256 HP/kg (dry)
Bore x stroke
40.0 x 39.3 mm
Compression
15.2:1
Cooling system
Liquid
Fuel system
Carburettor
Starting
Kick
Ignition
Electronic
Transmission
Gearbox
4-speed
Transmission type
Manual
Final drive
Chain
Clutch
Centrifuge
Dimensions & weight
Wheelbase
900 mm
Seat height
600 mm
Dry weight
43.0 kg
Fuel capacity
3.00 litres
Chassis & suspension
Front suspension
Paioli, 33 mm
Rear suspension
Paioli monoshock
Brakes & wheels
Front brakes
Expanding brake (drum brake). Hydraulic
Front brakes diameter
160 mm
Rear brakes
Expanding brake (drum brake). Hydraulic
Rear brakes diameter
140 mm
Front tyre
2.50-10
Rear tyre
2.75-10
Other
Color options
Blue/white
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
2010
2012
2013
2015
2016
Capacity
49 cc
49 cc
49 cc
49 cc
50 cc
Dry weight
43 kg
43 kg
43 kg
43 kg
43 kg
Seat height
600 mm
600 mm
600 mm
600 mm
630 mm
Fuel capacity
3 L
3 L
3 L
3 L
3 L
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
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