Small Engine Parts

Engine Block

Structure which contains the cylinder, plus any cylinder sleeves and coolant passages.

Piston

An object in an engine moving up and down, pulling fuel in then making it into a spark to create energy for an engine

Fuel Bowl

Piece under a carburetor that allows fuel through the emulsion tube and vent into the carburetor throat

Choke Valve

Chokes the air supply in order to provide the proper ratio of fuel to air

Carburetor Barrel / Throat

The passage that air and fuel move through, between the choke and the throttle

Crankshaft

Converts the reciprocating motion into rotational motion. Pumps the piston up and down in the combustion chamber.

Throttle Plate

Allows more air to enter the engine and thereby increases engine power.

Connecting Rod

Rod connecting the Cylinder head to the crankpin of a crankshaft

Venturi

Causes air / fuel to flow faster through it’s cone shape

Emulsion Tube

Mixes fuel and air for the main circuit. Maintains the air fuel ratio at all speeds.

Float

Controls fuel flow, maintaining the fuel level in the chamber. When the fuel level raises this high enough, the needle and seat are forced to close.

Carburetor Fixed Jet

Mixes air and fuel by means of several jets.

Carburetor Adjustable Jet

Controls fuel / air mixture between idle and 1/4 throttle