FEATURESNew 9-port Cylinder: Higher performance, excellent fuel efficiency, great drivability with more torqueRTX Rotating Backplate: Reduces friction between the connecting rod and backplate, improving stability at idle, boosting engine power, and optimizing fuel efficiency for extended runtimeHigh-Protection Bearings: Includes a double-seal front bearing for durability and stability, along with a 9-ball rear ceramic bearing for reliability under extreme conditionsBalanced DLC CrankshaftAVAILABLE MODELSENBU0041: 921 Speciale™ Limited EditionENBU0041B: 921 Speciale™ Limited Ed. - Pre Break-In Service by Mario RossiTECHNICAL SPECIFICATIONSFeature DetailsCategory 1/8 BuggyDisplacement [cm³] 3.5Bore [mm] 16.2Stroke [mm] 16.9 Inlet Ports 7Outlet Ports 1Front Bearing7x19x6 Double SealRear Bearing14x25.4x6 9 Balls High-Durability CeramicCarburetor Diameter [mm]7.0 (Options: 6.0, 6.5, 7.5, 8.0)Carburetor TypeVCX3-A Aluminum Short NeedleWeight [g]345Fuel Consumption [min]> 9Operating Temperature [°C]110-130To maximize the performance of your 921 Speciale™ engine, we recommend pairing it with:Glow Plug: REDS TS4Exhaust System: 2143 X-ONE High Torque Plus PipeFuel: 16–30% nitro, 8–10% oilBreak-In Fuel: 12% oil