M300 is a essential bike of BOSUER M series dirt bike. The engine is CBS300, water cooled, with balance shaft. The engine power is 18.5kw at 8500rpm, 4 valves.

  • The 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.
  • The suspenssion of the bike adopt competition class equippment to ensure the bike is able to used on track if need.


Engine: ZS CBS300S 4-valve engine, 4-stroke, internal balance shaft, 6-speed, electric 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 & exhaust pipe: exhuast pipe and muffler ends are stainless steel and muffler body are in alloy

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product features

Product parameters 

Product parameters 

ENGINEEngine Type:ZS CBS 300cc,water cooled,4-valve,inner balance crank shaft, E&kick start,5 gear
Bore X Stroke:74 x 65 mm
Compression Rate:10.7:1~11.3:1
Max Power:18.5kw/8500rpm
Max Torque:23N.m/7000rpm
Valve System:5-speed
Carb:Carburetor PWK34
gear ratio#520 chain, 13T/49T
CHASSISFuel Tank Capacity6.5L
handle BarAlloy, fat type, Ф28.5
Triple ClampForged alloy 6061
FrameEmbracing high strengthened formed alloy
Swing ArmFormed alloy, knife shape
Front ForkFront fork: 54/60-930mm, damping adjustment
Rear ShockRear shock: 480mm , inner box, damping adjustment
Disc Brake SysDisc brake, disc size: front:240mm / rear:240mm 
Wheel SizeAlloy rim, CNC hub, rim size: front: 1.60-21/rear: 2.15-18
Tire SizeTire size: front: 80/100-21 / rear: 100/90-18
DIMENSIONSMax Loading90kg
Seat Height1450mm
Wheel Base930mm
Net Weight117±1kg
Pacing Carton Size1860*580*1080mm
Max Packing Weight138±1kg