The RB Concept C6 BBT II L2G is now as popular as the famous, 3 times world champion, RB Concept WS7. As a result, RB decided to launch a special edition for USA only with specific parts increasing performance. This engine was especially developed to meet the needs of US tracks with high power at low RPM allowing you to jump higher and further. Featuring a specific Turbo combustion chamber providing higher RPM, the hand modified crankshaft has been designed to increase power at low RPM and received the RB Concept coating in order to prevent the wear of the pin. Finally, the carburetor is provided with a 8mm venturi.