period of time when intake and exhaust valves in a four-stroke cycle engine are open at same time.

a precision measurement tool used to take accurate measurements of inside surfaces.

main member of rear suspension that provides a mounting place for rear wheel and one end of shock absorbers.

fuel metered by clearance between jet needle and needle jet is partially mixed with air from air jet and discharged into venturi of carburetor.

use of chain, gear, or belt drive to connect crankshaft to clutch and gearbox into shaft.

a precision measuring tool for taking accurate measurements between outside surfaces.

with an excess amount of electrons which flow toward positive terminal.

two or more parts that contact each other during operation and set up wear patterns.

a gearbox where power is transferred from clutch to input shaft to output shaft. Output shaft has a sprocket mounted on one end.

an opening or passage which directs flow of exhaust gases out of engine. In a four-stroke cycle, it is located in the head. With a two-stroke cycle, it is in the cylinder.