It's nearly always the Diaphragm in the Carburettor
i guess so if it runs and goes fast it must work
If the lawn mower is run without oil, the connecting rod bearing will heat and score, or even "weld" to the crankshaft, causing major damage.
carb. adjustment, oil my need to be changer, air filter is dirty. fuel filter needs to be replaced
Your mower is over fueled - could be the choke is stuck on or the needle might be stuck open on your float. Could also be running rich due to a dirty/clogged air filter or faulty spark plug.
It goes into reserve
Try cleaning the carburetor if there is a filter replace it.
It is important to address the issue of oil on spark plugs in a lawn mower because oil on the spark plugs can prevent them from firing properly, leading to poor engine performance, difficulty starting the mower, and potential damage to the engine. Regular maintenance and addressing this issue promptly can help ensure the lawn mower runs efficiently and effectively.
Inlet needle in carb sticking open; it runs in through the carb.
Change the gasket under the carb. The part cost about $5 and will take you about 30 minutes to change.
Oil is a lubricant that helps to keep an engine running. If a person runs a lawn mower without oil, the mower will run, but it will cause problems like stalling out, or worse. +++ Its engine will run, but only for a very short time before seizing, probably ruining it.
Close choke (if equiped), if not, consider servicing the carby or the fuel pump. * This answer is answered in assumption that it runs after start. If you have to put petrol down the carby to keep it going, consider servicing/replacing the carby
if it is blocked with debris such as grass cuttings. For research purposes remove filter and start mower without it. If mower runs successfully, you have the cause of the problem.