c'est clair, parfois ils font n'importe quoi:
et parfois non

:

Specifications:
1) Engine type: single cylinder, 4-stroke, air-cooled
2) Max output and rotating speed: 4.2/8500kW/rpm
3) Max torque and rotating speed: 3.0/6500N.m/rpm
4) Cylinder bore: 39mm
5) Stroke: 41.4mm
6) Gearshift: four gears, gear drive transmission by foot gear ratio
7) Ignition type: CDI

Displacement: 39ml
9) Compression ratio: 9.0:1
10) Carburetor: Piston type PZ17A
11) Lubrication system: 15W/40-SE four stroke engine oil
12) Seat height: 600mm
13) Tire: front 90/65-10 rear 145/50-10
14) Oil capacity: 1.8L
15) Dimensions (L x W x H): 1500 x 600 x 800mm
et SURTOUT ils sont tordant de rire:
ICI