RB CIRCUIT 10 Evolution of the very plebiscited C9, the Circuit 10 receives the brand new RB strengthened crankcase. This new crankcase avoids distortion and vibration, which makes the engine more reliable and powerful. Its enhanced sleeve ensures a better reliability and increased longevity. This engine was developed with all the RB know-how for the most demanding RC class. - Very high level racing engine - 9 ports + Multi Exhaust System (MES) - Light machined piston rounded with special shape and smart groove to remove easily the wrist-pin clips - Strengthened and better cooling crankcase - Modified crankcase for a better internal flow - Turbo plug - Turbo combustion chamber with o-ring avoiding vibrations and preventing dirt - 14.5mm double balanced crankshaft with silicon paste (long stroke) - 14.5mm main bearing - Aluminum 9mm carburetor with 8.5mm orange anodized venturi and 1 extra 9mm new shape venturi - Aluminum orange wrist pin - On-road L2G cooling head - Dust protection caps.