MR300S is a profesional competition bike of BOSUER M series dirt bike. The equipped with 300cc, double camsahft, water cooled, with internal balance shaft. Engine power is 23kw at 8500rpm, 4 valves.

  • MR300S frame is made of alluminume. Forged alloy parts with strengthened formed alloy pipe connect together make the structure of the frame. With T4 & T6 treatment, the frame is not only less weight but also solid enough for competition.
  • Other parts, such as rim, hub are all made of alluminume to reduce weight of the whole bike.
  • Brake system are designed by BOSUER exclusively, new shape discs, double piston, MOJO brand as upgrade parts BOSUER.
  • 21″ front Rim and 18″ rear rim are 7 series alloy, hollowed CNC alloy hub.


Engine: ZS NC300S 4-valve engine, double camshaft, 4-stroke, internal balance shaft, 6-speed, electric and kick start
Frame: steel full size dirt bike frame with linkage, alloy swing arm
Wheel: front 21″, rear 18″
Suspension: adjustable
Brake system: Mojo brake, 2 pistons of front brake, 1 pistion rear
Muffler: stainless steel with power bomb

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product features

Product parameters 

Product parameters 

ENGINEEngine Type300cc , 4-stroke,4-valve,water-cooling, double overhead camshaft, with balance shaft
Bore X Stroke(mm)82.0×53.6mm
Expression Rate11.8:1
Max Power23kW/9000rpm
Max Torque25N.m/7000rpm
Chain/Sprocket520-13/520-52CNC sprocket
CHASSISFuel Capacity6.5L
Handle BarAlloy, fat type, Ф28.5
Triple ClampForged alloy 6061
FrameEmbracing high strengthened formed alloy
Swing ArmFormed alloy, knife shape
SuspensionFront fork: 54/60-930mm, damping adjustment
Rear shock: 480mm , inner box, damping adjustment
Disc BrakeDisc brake, disc size: front:240mm / rear:240mm 
WheelAlloy rim, CNC hub, rim size: front: 1.60-21/rear: 2.15-18
TireTire size: front: 80/100-21 / rear: 100/90-18
DIMENSIONSMax Loading90kg
Seat Height940mm
Wheel Base1450mm
Net Weight116±1KG
Package Size1860*580*1080mm
Gross Weight137±2KG