New OS Speed R2104 replacing the O.S. SPEED R2103
The new engine has a redesigned 9-port liner to improve torque in low-middle power range.
A redesigned crankshaft counter weight enables smooth power transition from low to top.
Distance between the cooling fins is enhanced for better air flow and better balance. It also features an anodized in two colors; black and red.
An silicon O-ring fit to the inner head prevents dust from coming into the engine.
Content: 3.49 cc
HP: 2.8 ps / 2.76 hp at 33000 r.p.m.
Practical range: 4000-45000 r.p.m.