Unit: pc
Qty: Temporarily out of stock.
429,00 €
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This is the OS Speed B2103 Type S engine. This 3-port long-stroke engine offers a high torque at mid-low range with a sweet delivery and low consumption. The crankcase, the crankcase cap and the carburetor feature a new design. The new DLC-coated crankshaft has two tungsten counterweights for smooth rotation and better balancing. The B2103 Type S comes with a low–profile cooling head to provide better drivability and also vertical fins on the top to improve heat dissipation. An O-ring between the cooling head and the combustion chamber insert reduces vibrations protect against dirt thanks to a better sealing. The new 22D carburetor guarantees high response and smooth acceleration.



  • The long-stroke off-road engine put a high value on torque in low-middle range with smooth operation and better fuel mileage
  • The crankcase, carburetor and cover plate, and inner head are designed new.
  • All the parts are interchangeable to those of TYPE R’s.
  • High vertical finned low-profile cooling head for improving the drivability and better heat dissipation
  • The new DLC coated crankshaft has two tungsten counter weights for smooth rotation and the best balance
  • A newly designed 3-port cylinder& piston set
  • The inner head with a silicon O-ring for reducing vibration and preventing dust
  • A newly designed 22D carburetor, which produces high response and smooth acceleration
  • Replaces Speed Spec III


Technical specifications:


  • displacement 3.49cc
  • bore 16.27mm
  • stroke 16.80mm
  • rpm 4000-42000 rpm
  • max output 2.64hp/34000 rpm
  • weight 347gr
  • recommended exhaust T2100SC
  • port 3-port


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