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No, SAW filters are completely passive devices. You cannot get gain from a SAW filter, and they obey the rules of reciprocity (i.e. S12 = S21).
With a coffee filter
replace the plug, clean dirt from carb, change the air filter,
I never saw this model but the transmission filter on every transmission I ever did see - was -inside the transmiision bottom cover.
Budy,the problem not be the air filter,might be the carb or cylinder have problems.