Model FSL400BGC Inline FourCylinder Engine Kit A precision metalengine kit designed for hobbyists, educators, and RC model builders. This compact, readytoassemble fourstroke engine provides realistic operation, upgrade options, and detailed mechanical learning value. Key benefits Handson learning and accurate mechanics: Precisionmanufactured metal parts and clear instructions make assembly straightforward while revealing real engine structure and principles. Smooth, speed performance: 90degree phased crankshaft, added crankshaft support bracket, and dual oil seals improve stability and reliability up to a 13500 rpm maximum. Easier startup and operation: Electric start, CDI ignition, and a redesigned carburetor with matched fuel needle simplify starting and throttle response. Upgradeable and serviceable: Splash lubrication is standard with an enlarged oil sump for easy upgrade to independent lubrication. Dual synchronous pulley timing reduces the chance of timing belt skipping at rpm. Compact, displayready design: Sportsinspired gold finish delivers a realistic look suitable for desktop display or model integration. Primary specifications Model: FSL400BGC, Kit Version Material: Metal Configuration: Inline fourcylinder, fourstroke Displacement: 14 cc (4 x 3.5 cc) Bore x Stroke: 16.6 mm x 17.0 mm Valve mechanism: OHC (overhead camshaft) Camshaft: angle camshaft for improved throttle response RPM range: 3200 to 13500 rpm Power output: 3.05 hp Cooling: Watercooled and aircooled Lubrication: Splash lubrication (upgradeable to independent lubrication) Start: Electric start Ignition: CDI ignition Spark plug: ME8 type, 1/432 thread Start power source: 6 to 12 V, recommended 2S to 3S Lipo battery Fuel: 92 and above gasoline Lubricant: Common lubricating grease for camshaft maintenance Product weight: 1250 g Product dimensions: 16.35 x 5.05 x 10 cm Package dimensions: 21.5 x 21.5 x 17 cm Package weight: 1950 g Packing: Box Key design details and upgrades Integrated crankshaft with 90degree phasing for balanced firing intervals and smoother response. Crankshaft support bracket for enhanced speed stability and longevity. Dual oilseal on crankshaft to minimize leakage at rpm. Upgraded valve manufacturing process increases service life compared to previous designs. Redesigned intake manifold and carburetor, including a matched fuel needle for easier starting and tuning. Enlarged oil sump to facilitate future conversion to independent lubrication. Dual synchronous pulley timing structure to lower the risk of timing belt skipping under load. Package contents Engine parts set x1 Tools kit x1 Instructions x1 Typical use scenarios Hobbyist RC installation: Integrate the FSL400BGC into custom RC cars, boats, or similar scale projects where a compact, revving fourcylinder engine is required. Educational kit and demonstrations: Use as a teaching aid to demonstrate fourstroke operation, valve timing, and basic mechanical principles in workshops or classroom settings. Desktop model and display: Assemble and display the engine as a detailed model for collectors or as a functional conversation piece. Compatibility and maintenance notes Requires 92 or higher gasoline and routine application of lubricating grease to the camshaft. Electric start requires a 6 to 12 V power source; a 2S to 3S Lipo battery is recommended. Splash lubrication is standard; the design allows upgrading to independent lubrication for extended operation. Regular inspection of seals, timing pulleys, and fuel needle tuning will help maintain performance at rpm. This kit delivers a realistic, serviceable fourcylinder engine suitable for handson building, model integration, and educational use while offering upgrades and design features aimed at stable speed operation.