Weegy: In a four-stroke engine, the time period when both valves are slightly open is called valve overlap. (More)

Weegy: In a cylinder block, the opening that the valve head rests in is called the valve seat. User: In a four-stroke engine, the timing gears control A. when the spark plug fires. B. the speed of the air flow through the carburetor. C. when the valves open and close. D. the amount of fuel that reaches the cylinder. Mark for review (Will be highlighted on the review page) Weegy: In a four-stroke engine, the timing gears control - when the valves open and close. (More)

Weegy: A governor is used to control: engine speed. User: The vertical travel distance of an intake or exhaust valve is called the A. overlap. B. duration. C. opening. D. lift. Weegy: The vertical travel distance of an intake or exhaust valve is called the: LIFT. User: The purpose of the piston rings is to A. prevent the connecting rod from disconnecting from the piston. B. allow oil to build up on the cylinder walls. C. prevent the piston from moving up and down too fast in the cylinder. D. form a seal between the piston and the cylinder. Weegy: The purpose of the piston rings is to form a seal between the piston and the cylinder. (More)

Weegy: A RECOIL SPRING is a component of a rope-rewind starter system. User: In a two-stroke reed valve engine, the reed valve is used to seal fuel in the A. crankcase. B. combustion chamber. C. precombustion chamber. D. intake port. Weegy: In a two-stroke reed valve engine, the reed valve is used to seal fuel in the CRANKCASE. (More)

Weegy: the answer is B. crankcase to the top of the combustion chamber. (More)