If your model # ends in 707, as in 42A707, it does not have an oil filter. You would see it sticking out of the left side if it had one, as in 42A777. You have an opposed twin,a very good engine, unfortunatly, not made anymore. Most of them did not have an oil filter. Dwain
SOURCE: engine on riding lawn mower surging
Dirty air cleaner.
Clogged fuel filter.
Replace or clean both...
SOURCE: Briggs and stratton engine surges and slows, repeatedly
There is still either water or debree contaminating the fuel system. Surging is usually debree, empty and flush the tank with gas or Iso alcohol, disassemble carb soak in solvent for 30 minutes blow out the carb passages, reassemble and if the problem persists run engine at top rpm with air cleaner off and block off carb intake with hand, this will stall the motor restart and repeat 4 - 5 times this wiil draw out any debree or other blockage in the carb.
SOURCE: Briggs & Stratton Briggs Stratton Intek V -
these are common for doing this ,if you dont want to pull it down and hone the cyl. then i would use a heavier oil say 20w/50and that will probabley solve your problem
SOURCE: How much oil does my craftsman riding mower hold? ...
4.5 pints with filter or 4 pints without
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