If you put too much oil in a weed eater gas it can result in excessive smoking, fouled spark plug and even possible engine damage in some cases.
A slight overfill of the oil in the weed eater gas won't often cause any issues other than being smoky but too much oil in the weed eater gas can cause the weed eater engine to run poorly, stall, bog down or even seize up.
Too much oil in the weed eater gas mix can coat the spark plug and prevent it from firing correctly, which can result in starting problems or even misfires and too much oil in the weed eater gas can also create a rich fuel mixture, which can lead to a loss of power and sluggish engine performance of your weed eater.
And too much oil in the weed eater gas an also result in carbon deposits forming on the cylinder walls, piston and exhaust port which can result in scoring or other damage.
And in some cases, adding too much oil in the weed eater gas can cause the weed eater engine to overheat and also seize, especially if the oil is of bad quality or if the weed eater engine runs at low speeds for too long of a time period.
Other reasons why a weed eater bogs down at full throttle include fuel or air delivery issues which can be a result of clogged carburetor, dirty air filter, fuel cap issues, or even bad fuel lines or clogged fuel filter inside the tank of the weed eater.
A clogged carburetor, which is often caused by old fuel or debris, can restrict the flow of fuel and cause the weed eater engine to bog down or stall at full throttle.
A clogged fuel filter and even a blocked fuel cap vent or clogged or cracked fuel lines can cause your weed eater to bog down or even stall out.
When the air filter is dirty it restricts the airflow, which leads to a rich fuel mixture and bogging down or even stalling.
A clogged spark arrestor or even bad spark plug can also result in the weed eater bogging down at full throttle or to cut out when revved or at any other time as well.
Even bad gas or moisture in the gasoline can also cause your weed eater to bog down at full throttle or to cut out when revved or even cause it to start and die or not start at all.
Also an incorrect oil to fuel mixture or even straight gasoline can cause the engine of the weed eater to bog down or stall when revved.