Polini 911 GP4 - 2007 Specifications and Reviews

The 2007 Polini 911 GP4 is a lightweight sport minibike designed for young riders and racing enthusiasts seeking high performance in a compact package. Its 39.69cc single-cylinder engine delivers 4.20 horsepower with a 14.0:1 compression ratio, making it ideal for competitive pit bike racing. Known for its nimble handling and minimal 22kg weight, this machine excels in tight circuit work and entry-level motorsport competition.

2007
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Engine and Transmission Specifications

ClutchDry with centrifuge counter weigths
Transmission typefinal driveChain
Cooling systemAir
StarterKick
Fuel systemCarburettor. SHA 14.14
Bore x stroke36.0 x 39.0 mm (1.4 x 1.5 inches)
Compression14.0:1
Power4.20
Stroke2
Engine typeSingle cylinder
Capacity:39.69 ccm (2.42 cubic inches)

Physical measures and capacities

Overall width240 mm (9.4 inches)
Overall length960 mm (37.8 inches)
Seat height425 mm (16.7 inches) If adjustable, lowest setting.
Dry weight22.0 kg (48.5 pounds)
 
 

Polini 911 GP4 dimensions and frame

Rear brakes diameter130 mm (5.1 inches)
Rear brakesSingle disc
Front brakes diameter148 mm (5.8 inches)
Front brakesSingle disc
Rear tyre dimensions110/50-R6.5
Front tyre dimensions90/65-R6.5
Frame typeLatticed tubular frame
 
 

Speed and acceleration

Power/weight ratio0.1909 HP/kg

CategoryMinibike, sport
Year2007
ModelPolini 911 GP4

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay
Color optionsBlue/white

Performance Profile & Rider Fit

4.2 hp
Peak Power

Best For

Track80%
City10%
Cornering85%
Daily Riding5%
Touring2%
Passenger0%

Rider Profile

Best ForThis is a minibike best suited to riders who already understand throttle and body-position control, typically used to hone race-craft rather than as a first bike for absolute beginners.
PurposeIt exists purely for minimoto track days and pit-bike style sprint racing, where its tiny displacement and featherweight chassis reward corner speed over horsepower.
Rider FitThe extremely low seat height and minimal weight make it accessible to smaller or lighter riders, but adults will ride in a cramped, knees-high tuck.
CharacterIt has the playful, revvy, flickable personality of a pure minimoto racer, living for tight, twisty go-kart-style circuits.
Not Ideal ForIt is not suitable for anyone wanting real-world commuting, highway travel, passenger carrying, or any off-road riding.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.

Rider Reviews

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