Check oil level, if ok remove spark plug and crank engine. If it spins then likely "starter stall" due to valve lash out of tolerance. BS OHV engines require periodic adjustment of the valves.
If oil level is excessively high then likely engine has hydro-locked... the cylinder(s) are full of oil/fuel due to a stuck carburetor float.
SOURCE: engine on riding lawn mower surging
Dirty air cleaner.
Clogged fuel filter.
Replace or clean both...
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: we have 42'' Yard Man riding lawn mower need to how to change oil
it's a square head pipe plug @ base of eng. either right or left side of machine may also have a quik change fitting instead its black plastic w/ yellow cap
Testimonial: "Thanks for the info, you where right on the money.. I finally found it, its on the right side if you were sitting on mower. Thanks again!"
SOURCE: i need an owners manual for a brute riding lawn
This was very difficult to find, but I found it just for you! Please make sure you rate my answer 4 thumbs up! Thanks so much for understanding, it would be a huge help to me. I would be forever grateful if you could do this for me. To view the manual you will need adobe reader, which you can get for free from http://get.adobe.com/reader/ You probably already have it though, please try opening the file first and find out. Here is the manual / guide please give it a few minutes the file is quite large:
http://www.doitbestparts.com/MANUALS/BRUTE/7800583.PDF
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