OS MAX-B21 WITH EFRA 2089 COMBO SET

This is the O.S. 21XR-B Ver.2 club-level nitro GT and off-road engine with the EFRA 2089 pipe The power plant targets club level drivers and it features the 21J3 3-needle carburettor with 7mm and 8mm venturi inserts. Tech specifications: Displacement: 3.49 cc Bore: 16.27mm Stroke: 16.80mm Intake ports: 3-port Practical RPM range: 4,000 – 40,000 rpm Max. power output: 2.42 hp / 34,000 rpm Weight: 380Gr