Question about Briggs & Stratton Garden
Mountfield SP550 lawnmower engine running too fast, throtle open flat out
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Posted on Jan 02, 2017
there are a couple things you can do to maybe make the mower run without choke being on, remove the carb, disassemble float bowl and use a bread tie to clean out the jets and tubes. while you are inside the carburetor float assy, check the nut that holds the float bowl and make sure that the small hole is open, to test this yiu can blow into the hollow of the nut and see if there is air escaping or not, this entails getting the taste of gasoline on yiur lips, but a small price to pay as oposed to a mower shop service charge. i remedied my problem with a bread tie to clean the jets(openings) some are large enough to use a small paper clip. once you are relatively sure yiu checked and cleaned all the tubes, jets, and holes, reassemble the carb and put it back on and give er a yank see what happens, you'll probably find this worked and fixed your problem,
Posted on Jul 29, 2009
If it is a small horsepower engine 4, 5, 6 HP, it will take approximately 20 ounces. If it is a larger engine8, 9 ,10, 11, 12 and on up it will take from 40 to 48 ounces
Posted on Sep 15, 2009
Hunting and erratic operation are signs of air leaks or diminished fuel flow at WOT settings.
If this mower is running a vacu jet style carb with a diaphragm you simply take off the air cleaner, the vent tube, and then the four screws holding the carb on the gas tank and after the carb body can be lifted remove the throttle linkage so you can flip over the carb and pull the main jet and clean the inlet screens.
Posted on Aug 11, 2010
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