The most common reason why your 2 stroke engine stalls when you try to rev is due to fuel delivery issues such as a clogged fuel filter, clogged or bad fuel line or clogged carburetor.
Reasons why your 2 stroke engine stalls when you try to rev it 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.
A clogged carburetor, which is often caused by old fuel or debris, can restrict the flow of fuel and cause the 2 stroke engine to stall when you try to rev.
A clogged fuel filter and even a blocked fuel cap vent or clogged or cracked fuel lines can cause your 2 stroke engine to stall or not start at all.
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 your 2 stroke engine stalling when revving or other times as well.
Even bad gas or moisture in the gasoline can also cause your 2 stroke engine 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 2 stroke engine to stall when revved.