O.S. B2103 Type R engine with OS T2100SC exhaust system

Unit: Set
Qty: Temporarily out of stock.
529,00 €
Qty.: - +
   - or -   

The OS B2103 Type R engine is a 5-port long-stroke engine that offers great power at medium-high speeds. 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. It shares the same new features as the Type S engine except the cylinder and the cooling head which has a standard round shape. 



  • The long-stroke off-road engine put a high value on beasty power in mid-high speed range.
  • The crankcase, carburetor, cover plate, crankshaft and inner head are designed new.
  • All the parts are interchangeable to those of TYPE S’s.
  • A newly designed 5-port cylinder & piston set (5 scavenging port+ 3 exhaust port)
  • A standard round type outer head
  • A newly designed 22E carburetor for producing high power
  • Includes the OS T2100SC exhaust system


Technical specifications:


  • displacement 3.49cc
  • bore 16.27mm
  • stroke 16.80mm
  • rpm 4000-42000 rpm
  • max output 2.64hp/34000 rpm
  • weight 354gr
  • exhaust T2100SC
  • port 5-port


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