i usually don't reply.
kopitiam is too bodo and no fun nowadays. i lazy act stupid.

but this is too bodo beyond my tolerance.
there's no A/F adjustment for those cheap simple 2T carburetor used in those simple cheap 2 stroke mesin rumput.

nope. there's no main jet adjustment.
nope. there's no pilot jet adjustment.
well some have but most don't. maybe those 4 stroke hondas have them. never opened honda brush cutter engines before. nobody owns one becos too expensive.

A/F ratio can't be adjusted by mixing ratio cup you buffoons.
A/F ratio can be adjusted by mixing screws that change the vacuum pressure at the main jet assembly hence controlling the fuel ratio mixture that goes to the fuel needle and cup assembly.
which is missing in those simple cheap carburetor fixed to brush cutter.

so you adjust at the fuel needle.
this is the fuel needle in case /k experts have never seen one:


change to higher level (push the needle deeper) to reduce fuel mixture.
change to lower level (push needle shallower) to increase fuel mixture.

how the f /k experts dunno bout this?
tokok so much bout mechanical engineering like goddam experts.


you increase the airflow to compensate for current fuel mixture by removing the filter.
but risk of debris being sucked into the cylinder causing scratching and broken ring scratched cylinder wall/piston yada yada.

clean the filter and reduce the fuel mixture is a much safer method. do it properly.