Positioned in Polini's minibike, sport motorcycle lineup, the 2005 Polini 911 GP 3 Junior relies on a 39.7 cc (2.4 cu in) air-cooled single cylinder, two-stroke powerplant. In factory specification, peak output is rated at 4.2 HP (3.1 kW). Internal engine geometry specifies a bore and stroke of 36.0 x 39.0 mm (1.4 x 1.5 inches) with a 16.5:1 compression ratio.
On the scales, the 911 GP 3 Junior measures 20.5 kg (45 lbs) dry. Rider ergonomics and chassis geometry center around a 395 mm (15.6 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops.
Standover Height
395 mm (15.6 in)
Engine
Displacement39.7 ccm (2.42 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Power4.2 HP (3.1 kW))
Compression16.5:1
Bore x Stroke36.0 x 39.0 mm (1.4 x 1.5 inches)
Fuel SystemCarburettor
IgnitionElectronic
CoolingAir
Transmission
ClutchDry with centrifugal counter weights
Chassis
Frame TypeLattice tubular frame
Wheels & Brakes
Front BrakesSingle disc
Rear BrakesSingle disc
Dimensions & Weight
Dry Weight20.5 kg (45.2 pounds)
Power/Weight0.2049 HP/kg
Seat Height395 mm (15.6 inches) If adjustable, lowest setting.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
