Nik,
Check the rotary screen on the back of the motor. Is it missing/damaged?
Air is fed into the filter housing from the blower housing. The flywheel fan sucks the air in, then directs it across the motor for cooling, and some goes into the air filter housing. FWIW, you should probably pull all engine tins and clean the motor out. It will also be full of grass.
I'm sure you know, but make sure you get all the grass off the top of that carb opening. There is still a lot sitting there.
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