Working Principle: Using methanol as fuel. The process of moving from one end of the cylinder to the other when the piston reciprocates within the cylinder is called a stroke. The four-stroke engine is divided into an intake stroke, a compression stroke, a power stroke and an exhaust stroke.Speed: 2500-13500rpm Displacement: 3. 5cc Power: 0. 5ps@11500rpm Piston Diameter: 16.6mm Stroke: 17mmThe product is suitable for 1:10, 1:12, 1:14 scale model cars or model ships and other equipment, also can be used for classroom display, as teaching aids. Please use it carefully during operation. Do not touch the motor fan with your hands to avoid scratching. Do not touch the cylinder department with your hands to prevent burns.Model: TOYAN FS-S100AModel: FS-S100ASpeed: 2500-13500rpmPiston stroke: 17.00mmCylinder diameter: 16.60mm 16.7mmDisplacement: 3.5ccPower: 0.5psColour:blackMaterial:Aluminum alloy + alloy steelSize:99.2 x 86.6 x 97.8mmPackage Contents:1 x Engine complete machine1 x Chinese and English manualOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.