Novarossi keep adding more new nitro engine to their range with the latest one being the all-new Mantra .21 square stroke off-road engine. It features a 16.42mm square stroke design, 14mm crankshaft, and a new piston and 4-port liner combination. The crankshaft is manufactured with a larger bore intake to increase mixture flow while the rear cover offers a steel plate for reduced conrod friction while the overall shape improves filling by reducing dead spaces. As a result the engine will offer an elastic throttle and linear power feel with increased torque in the mid to high RPM range and very low fuel consumption.