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
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