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FS-S100x series is a set of very precise single-cylinder four-stroke model engines. Before operating your engine, this article  give you a preliminary understanding of the functions of the various structural components of the engine in your hands.

Basic structure and components

1. Engine Hood
It plays a dustproof and decorative effect when the engine is shut down or running

2. Cylinder Head
The function of the cylinder head is to seal the cylinder, form a combustion space with the piston, and withstand the action of high temperature and high pressure gas. The cylinder head bears the mechanical load caused by the gas force and the tightening of the cylinder bolts, and at the same time bears a high thermal load due to contact with the high temperature gas. In order to ensure a good seal of the cylinder, the cylinder head must neither be damaged nor deformed. For this reason, the cylinder head should have sufficient strength and rigidity.

3. Needle Valve
The main oil needle is also called [high-speed oil needle]-manages the medium-speed and high-speed oil supply of the engine. As the engine speed increases, the fuel supply ratio of the high-speed oil needle will gradually increase.

4.Idle mixture
The auxiliary fuel needle is also called [low-speed fuel needle]-manages the fuel supply of the engine at idle, idling to medium speed, and medium speed. As the engine speed increases, the fuel supply ratio of the low-speed fuel needle will gradually decrease. [Low Speed ​​Oil Needle] and [High Speed ​​Oil Needle] ~ The counterclockwise direction is "open" ~ the clockwise direction is "OFF".

5.Start Motor
As we all know, the starting of the engine requires the support of external force. The function of the starter motor is to use the current from the battery and make the drive pulley of the starter produce mechanical movement; thus, the flywheel of the engine is driven by the one-way bearing pulley to realize the start.

6.Engine Main Body
The main body of the engine casing is the basic part and skeleton of the engine, and at the same time is the basic part of the engine assembly. The function of the main body of the casing is to support the cylinder liner and ensure the accurate position of moving parts such as pistons, connecting rods, crankshafts, etc.; to ensure the ventilation, cooling and lubrication of the engine; it is called the cylinder block

7.Flywheel
The main function of the flywheel is to store the energy and inertia outside the power stroke of the engine. At the power output end of the crankshaft, which is the side where the work equipment is connected

8.Fuel Inlay
The interface where the fuel enters the carburetor is called the fuel inlet, which is connected to the fuel tank outlet pipe

9.Crankcase
Crankcase. The cylindrical cavity in the upper part of the cylinder is called the cylinder, the lower half is the crankcase that supports the crankshaft, and the inner cavity is the space for the crankshaft to move.

10. Idle screw
[Idle speed screw]-manage the engine idle speed, after the new machine is run-in and debug state, it can determine the future [low speed oil needle] and [high speed oil needle] poor and rich oil status, so the [idle screw] can be called the entire engine debugging The axis of the carburetor, and the [idling screw] is a carburetor adjustment screw that separates the two extremes of important and unimportant. In summary, the [idling screw] is definitely not an adjustment screw that can be left alone.

11.Carburetor 
The role of the carburetor mixes a certain amount of fuel with air to make the engine run normally.

12. Camshaft
Its function is to control the opening and closing of the valve. The main body of the camshaft is a cylindrical rod with approximately the same length as the cylinder group. There are several cams on it to drive the valve

13. Exhaust nozzle
After the engine has been running for a period of time, the waste lubricating oil after burning the internal fuel of the engine is discharged out of the engine through the drain nozzle

14. Timing belt
The function of the timing belt is to link up and down. The upper connection is the timing wheel of the engine cylinder head, and the lower connection is the crankshaft timing wheel; the timing wheel is connected to the camshaft, this camshaft has a cam, and its contact point It is a small rocker arm. The rocker arm generates pressure through the power brought by the timing belt and plays a role of jacking up.

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