Minibikes
2007Polini 910 GP4 Air Junior
24 fields on record
The 2007 Polini 910 GP4 Air Junior is a lightweight sport minibike designed for young racers and beginners learning competitive riding skills. Its compact 39.69cc air-cooled engine delivers responsive performance, while the chain drive and dry clutch provide engaging mechanical feedback ideal for developing rider technique on track or circuit.
- Capacity
- 39.7 ccm
- Engine
- Single
- Gearbox
- Not on record
Know it? Add it → - Dry weight
- 20.5 kg
- Seat height
- 395 mm
- Power
- 4.2 HP (3.1 kW)
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Designed for minibike racing and skill development on karting tracks or closed circuits rather than transportation.
- Built for
- A featherweight, high-revving little racer that rewards precise throttle control and body positioning over outright speed.
- Not ideal for
- Not suitable for adult commuting, highway use, touring, or carrying a passenger.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Engine
- Capacity
- 39.7 ccm
- Power
- 4.2 HP (3.1 kW)
- Engine type
- Single
- Power/weight ratio
- 0.2049 HP/kg (dry)
- Bore x stroke
- 36.0 x 39.0 mm
- Compression
- 14.0:1
- Cooling system
- Air
- Fuel system
- Carburettor
- Starting
- Kick
- Ignition
- Electronic with inductive discharge
Transmission
- Final drive
- Chain
- Clutch
- Dry with centrifuge counter weights
Dimensions & weight
- Overall length
- 940 mm
- Overall width
- 240 mm
- Seat height
- 395 mm
- Dry weight
- 20.5 kg
Chassis & suspension
- Frame
- Latticed tubular frame
Brakes & wheels
- Front brakes
- Single disc
- Front brakes diameter
- 148 mm
- Rear brakes
- Single disc. 130
- Front tyre
- 90/65-R6.5
- Rear tyre
- 90/65-R6.5
Other
- Color options
- Blue/White
Specs last verified against published sources: .
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
Rider Reviews
Common questions
What is the engine size of the Polini 910 GP4 Air Junior?
The 2007 Polini 910 GP4 Air Junior has a Capacity of 39.7 ccm (2.42 cubic inches).
What engine power does the Polini 910 GP4 Air Junior have?
The 2007 Polini 910 GP4 Air Junior has a Power of 4.2 HP (3.1 kW).
How much does the Polini 910 GP4 Air Junior weigh?
The 2007 Polini 910 GP4 Air Junior has a Dry weight of 20.5 kg (45.2 pounds).
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