O.S. SPEED R21 EURO SPEC II ENGINE
O.S. SPEED R21 EURO SPEC II ENGINE
O.S. SPEED R21 EURO SPEC II ENGINE
O.S. SPEED R21 EURO SPEC II ENGINE
O.S. SPEED R21 EURO SPEC II ENGINE
O.S. SPEED R21 EURO SPEC II ENGINE
O.S. SPEED R21 EURO SPEC II ENGINE
O.S. SPEED R21 EURO SPEC II ENGINE
O.S. SPEED R21 EURO SPEC II ENGINE
O.S. SPEED R21 EURO SPEC II ENGINE
O.S. SPEED R21 EURO SPEC II ENGINE
O.S. SPEED R21 EURO SPEC II ENGINE
O.S. SPEED R21 EURO SPEC II ENGINE
O.S. SPEED R21 EURO SPEC II ENGINE
O.S. SPEED R21 EURO SPEC II ENGINE
O.S. SPEED R21 EURO SPEC II ENGINE
O.S. SPEED R21 EURO SPEC II ENGINE
O.S. SPEED R21 EURO SPEC II ENGINE
O.S. SPEED R21 EURO SPEC II ENGINE
O.S. SPEED R21 EURO SPEC II ENGINE

O.S. SPEED R21 EURO SPEC II ENGINE

 

Motor O.S. Engines R21 EURO SPEC II 1/8 pista nitro. 

 

OS Speed 

 

 

 


OS1DR00
Out-of-Stock
€439.90
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O.S.SPEED R21 EURO II - ON-ROAD 

 

This engine inherits the smooth and easy-to-use feeling of the predecessor, O.S. SPEED R21 EURO Spec. And by reviewing the counterbalance of the crankshaft, low and mid end power delivery has been improved. The smooth RPM drop and idling stability are also improved, and the optimum performance is demonstrated even in the long and harsh race scene. Succeeding the previous model, every part has been improved including the outer head with new design to improve the cooling performance. 

 

The outer head adopts the same design as the R2104, which has both high cooling performance and light weight with original laser marking.  

 

The cylinder with 7 ports and piston have a new design with cooling holes added to the bottom of the exhaust with the newly designed crankcase. 

 

The crankshaft is a specific just for this engine and uses 3 tungsten counterweights. This has improved the torque feeling at medium and low speeds and idling performance. 

 

Comes with 21M2 (B) carburetor, which is popular with many racers for maximum performance. ö8.5 reducer also comes as standard equipment. 

 

Combo set that comes with exhaust pipe set is also available. It is combination of the TR01 (EFRA2098+MR02) especially suits well for the circuit in Europe with longer straights. 

 

Specs: 

 

Displacement: 3.49cc 

Bore: 16.08mm 

Stroke: 17.20mm 

Output: 2.76hp @ 35.000RPM 

Practical RPM range: 4.000-45.000 

Weight: 340g 

 

 

Standard accessories: 

 

Glow plug RP7 

Exhaust seal ring 

Dust cap set (3, 16 & 18mm) 


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