Air filter's right inside the air filter/carburetor housing, just below the
choke. No fuel filter.
Didja look in the owner's manual? :-) If you don't have one, I can make you a
photocopy of mine (model 790R) for five bucks plus postage. Email me at
alphageek at milmac dot com if you're interested.
Chances are it's a fuel problem, rather than the air filter -- although since
you didn't even know it had an air filter, I'm guessing you never cleaned it.
:-) So clean the air filter first (directions in the manual), and if that
doesn't do the trick, it's probably time to disassemble and clean the
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