The latest Thunder Tiger PRO-21B series car & buggy engines have been designed for 1/8 scale radio-controlled model "off-road" or "buggy" type cars to combine high performance with easy handling and maintenance using modern CAD computer technology. Major components of the engine are machined from the highest quality materials using state-of-the art CNC manufacturing techniques, resulting in consistently high quality and reliability. The PRO series engines are equipped with dual ball-bearings, Schnuerle porting, ABC type piston and cylinder, and slide-valve carburetor. The "(P)" type series engines have been designed with half-thread crankshaft that enable the flywheel and the clutch set to be installed precisely and conveniently.