J11 is a full size bike of BOSUER dirt bike family, it is fixed with the biggest air cooled engine with BOSUER steel frame series.

  • The engine capacity is 300cc, 4-valve, air cooled, electric start. The whole bike is design for both competition and dural popurse more likely with the engine’s performance good at power and distant traval, easy maintanience. The engine is 6 speed, long range gear shifting will have more ridding feeling.
  • The plastic cover is BSE 250 version, it is designed with mutiple curve surface and dome cover together, not only has a protrude line but also pervade power scence.
  • Brake system are modified by BOSUER with MOJO logo as performance parts we apply to competition bikes, cooperate with new designed hollowed disc brakes.


Engine: CB300 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: stainless steel with power bomb

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product features

Product parameters 

Product parameters 

ENGINEEngine TypeTY 300CC , 4-valve, 4-stroke, air cooled, E start
Bore X Stroke(mm)72*68.2mm
Expression Rate9.2:1
Max Power19.8KW/8500rpm
Max Torque24N.m/6000rpm
CHASSISFuel Capacity6.5L
Handle BarAlloy, fat type, Ф28.5
Triple ClampForged alloy 6061
FrameEmbracing high strengthened formed steel pipe
Swing ArmFormed steel, knife shape
SuspensionFront fork : 54/60-930mm, rebound and compression adjustment
Rear shock: 480mm , air box, rebound and compression adjustment
Disc BrakeDisc brake, disc size: front: 240mm/ rear: 240mm
WheelAlloy rim, rim size, front: 1.60-21/ rear: 2.15-18
TireTire size: front: 80/100-21 / rear:100/90-18