The X4 is from a long development. After conquering the U.S. market they come in Europe!
UPOWER is the exclusive importer for France of this famous U.S. brand  -> www.pitsterpro.nl
again a majority of PITSTERPRO on the Mini Sx  of Vegas 2011
 
Engine:
149 UPOWER
Power ISO 15.3hp with the maximum torque at mid rpm
Single overhead cam head
Valves 27 and 23mm
Carburetor: Molkt 24
Aluminum piston and cylinder
Ignition CDI microprocessor and mini flywheel
Gearbox N1234
5-disc clutch  
Chassis:
Rear suspension with gas shock type De Carbon with spring 800lbs
Aluminium swingarm
Marzocchi front fork style, fully adjustable
CNC aluminum triple clamps Wheels 12''14'', aluminum hubs
LXR steel footpeggs
Brake pedal "over the bar" Front disc dual brake piston 210mm and 190mm single piston rear
Secondary transmission: 14x41 KMC chain in 420
Front brake lever with adjustable position
Forged clutch Lever
Exhaust line stainless pipe and aluminium muffler
Wheelbase: 1190 mm
Seat height 785mm  
Use of this pit bike
 not permitted on public roads
This dirt bike
should only be used on track specifically adapted and meet safety standards.
Warranty against defects