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
Engine and Transmission Specifications | |
| Clutch | Dry with centrifuge counter weigths |
| Transmission typefinal drive | Chain |
| Cooling system | Air |
| Starter | Kick |
| Fuel system | Carburettor. SHA 14.14 |
| Bore x stroke | 36.0 x 39.0 mm (1.4 x 1.5 inches) |
| Compression | 14.0:1 |
| Power | 4.20 |
| Stroke | 2 |
| Engine type | Single cylinder |
| Capacity: | 39.69 ccm (2.42 cubic inches) |
Physical measures and capacities | |
| Overall width | 240 mm (9.4 inches) |
| Overall length | 960 mm (37.8 inches) |
| Seat height | 425 mm (16.7 inches) If adjustable, lowest setting. |
| Dry weight | 22.0 kg (48.5 pounds) |
| | |
Polini 911 GP4 dimensions and frame | |
| Rear brakes diameter | 130 mm (5.1 inches) |
| Rear brakes | Single disc |
| Front brakes diameter | 148 mm (5.8 inches) |
| Front brakes | Single disc |
| Rear tyre dimensions | 110/50-R6.5 |
| Front tyre dimensions | 90/65-R6.5 |
| Frame type | Latticed tubular frame |
| | |
Speed and acceleration | |
| Power/weight ratio | 0.1909 HP/kg |
| Category | Minibike, sport |
| Year | 2007 |
| Model | Polini 911 GP4 |
Other specs | |
| Maintenance | Find parts, fluids, filters, maintenance tools and service items on eBay |
| Color options | Blue/white |
Performance Profile & Rider Fit
4.2 hp
Peak Power
Best For
Track80%
City10%
Cornering85%
Daily Riding5%
Touring2%
Passenger0%
Rider Profile
| Best For | This 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. |
| Purpose | It 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 Fit | The 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. |
| Character | It has the playful, revvy, flickable personality of a pure minimoto racer, living for tight, twisty go-kart-style circuits. |
| Not Ideal For | It 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.
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