O.S. Max .21 VZ-R, 7-port engine Version 2 has an improved internal crankcase core and re-shaped liner port for better mixture flow. A button-shaped inner head design to boost high-end rpm. A piston machined from bar stock for more strength. More crankcase webbing helps the engine cool better and adds structural strength. Rear exhaust port is cast as part of the cylinder to improve exhaust flow. 2-piece turbocylinder head is designed specifically to work with the new high-performance T-P7 Turbo Plug. Oversized blue anodized cylinder head for more cooling. True ABC construction (Aluminum Piston with a Chromed Brass Cylinder) reduces break-in time. The lightened piston improves cooling and acceleration. Con rod has lighter, more durable bushing material. Universal fuel inlet nipple can be repositioned for better access. Needle valve assembly is encased in a protective sleeve. Dual crankshaft bearings. Full linear action of a 20K Slide Valve Carb, for more consistent throttle response throughout the RPM range. Carburetor stop valve prevents the rotor from sliding too far. Crankcase backplate has an O-ring for a better seal. Pilot shaft crankshaft. This product includes one .21 VZ-R VER. 2 engine with 20K Slide Valve Carburetor. One P7 glow plug. One head gasket. Three dust caps. One instruction manual and decal sheet. One rubber exhaust seal.

Glow Fuel: 5%-30% Nitromethane (10% Recommended) with an oil content 16% or more. Manifold (Header). Silicone coupler. Tuned pipe or muffler.