Model STNF2 Red — Inline DoubleCylinder FourStroke Engine Kit A compact, metalbuilt inline twincylinder engine kit finished with red sport accents for a realistic mechanical appearance. Aluminum processing and oxidation coloring give a precise surface finish while keeping the structure lightweight and durable. Designed for hobbyists, model builders, and classroom demonstration. Key benefits Realistic, detailed model that demonstrates core fourstroke engine functions and timing. Compact and lightweight: easy to mount, display, or integrate with compatible gearboxes and model assemblies. Smooth, speed operation enabled by asynchronous crankshaft design and a torque 480 brushed motor for reliable electric starts. Improved timing stability from a dual synchronous belt pulley that reduces gear jumping risk at RPM. Accurate valve action using a short rocker arm for precise switching during operation. Well suited as a mechanical teaching aid, display piece, or upgradeable component for hobby projects. Main specifications Model: STNF2 Color: Red Material: Metal (aluminumprocessed, oxidationcolored surface) Form: Kit Version Displacement: 7.0 cc (3.5 cc x 2) Cylinder arrangement: Inline doublecylinder Cylinder diameter: 16.6 mm Stroke: 17.00 mm Engine type: Fourstroke Speed range: 4000 to 16000 rpm Power: 0.6 ps Cooling: Air cooling Starting mode: Electric Motor: torque 480 brushed motor included Ignition: Ignition modules not included Spark plug: Requires Ftype fourstroke electric plug, not included Starting voltage: 7.4 V (2S battery), battery not included Dimensions and weight Product dimensions: 11.2 x 9 x 9.2 cm Product weight: 535 g Package dimensions: 14.5 x 11 x 11.2 cm Package weight: 1000 g Packing: Graphic carton Package contents 1 x Engine model kit (STNF2) 1 x Instructions Compatibility and installation notes Kit version requires basic assembly and additional components for full operation: an appropriate ignition module, an Ftype fourstroke spark plug, and a 7.4 V 2S battery for starting, none of which are included. Designed to integrate with common hobby gearboxes and mounts; suitable for upgrades and custom installations. Typical use scenarios Educational demonstration: Use in physics or mechanical engineering classes to show fourstroke cycles, valve timing, and crankshaft motion. Hobby and display: Install in scale models or desktop displays for a realistic moving engine demonstration. Project integration: Combine with compatible gearboxes and control systems in custom hobby projects or mechanical prototypes. What makes it stand out Precision aluminum finish and sport styling for a realistic look. Mechanical design choices that prioritize stable speed operation and accurate valve control. Compact dimensions and moderate weight make it practical for a wide range of model and educational applications. Note This is a kit version. Ignition modules, spark plug, and battery required for operation are not included. Follow the included instructions for safe assembly and setup.