2007
Polini 910 GP4 Air Junior - Specifications & Review
Article Complete Info
| Articleid | 755500 |
|---|---|
| Category | Minibike-sport |
| Make | Polini |
| Model | 910 GP4 Air Junior |
| Year | 2007 |
Chassis, Suspension, Brakes & Wheels
| Frametype | Latticed tubular frame |
|---|---|
| Frontbrakes | Single disc |
| Frontbrakesdiameter | 148 mm (5.8 inches) |
| Fronttyre | 90/65-R6.5 |
| Rearbrakes | Single disc. 130 |
| Reartyre | 90/65-R6.5 |
Engine & Transmission
| Borexstroke | 36.0 x 39.0 mm (1.4 x 1.5 inches) |
|---|---|
| Clutch | Dry with centrifuge counter weights |
| Compression | 14.0:1 |
| Coolingsystem | Air |
| Displacement | 39.69 ccm (2.42 cubic inches) |
| Enginedetails | Single cylinder, two-stroke |
| Fuelsystem | Carburettor. SHA 14-14 |
| Ignition | Electronic with inductive discharge |
| Power | 4.20 HP (3.1 kW)) |
| Transmissiontypefinaldrive | Chain |
Other Specifications
| Coloroptions | Blue/white |
|---|---|
| Starter | Kick |
Physical Measures & Capacities
| Dryweight | 20.5 kg (45.2 pounds) |
|---|---|
| Overalllength | 940 mm (37.0 inches) |
| Overallwidth | 240 mm (9.4 inches) |
| Powerweightratio | 0.2049 HP/kg |
| Seatheight | 395 mm (15.6 inches) If adjustable, lowest setting. |
About Polini
Country of Origin:
Italy
Founder:
Battista Polini
Best Known For:
Tuning parts for scooters/minis (cylinders, variators, carbs) and minibikes
Company History
Polini is to small engines what big tuners are to superbikes: a byword for go-faster parts that work. From cylinders and variators to carbs and clutches, Polini kits help commuters and racers extract honest performance and reliability from 50–200 cc scooters and minis. The company also fields racing programs that feed development back into catalog parts, ensuring jetting tables, belt specs, and roller weights are grounded in track data. For decades, European teens learned mechanics through Polini—measuring squish, reading plugs, and feeling the difference a few grams of variator roller can make. Historically, Polini democratized performance, turning ordinary city runabouts into lively machines and seeding a culture of hands-on tuning that still thrives.