Briggs and Stratton 311777
Hi all. First post here. I'm hoping this isn't as bad as I think it is but here we go. I work got a free mower that 'had not run for over 2 years' according from the previous owner. It was not running (no fuel) so I changed out lines, fuel filter, and put new a new needle in the walbro carb and gave it an over all cleaning, new gaskets, etc. was running fine for a few weeks but its now missing from what I can tell. Not a smooth run, almost like I can hear the individual firing on the piston... Well I checked the plug, which is also brand new, and its black... Oily black... Oil level fine. Could I have gotten the wrong gaskets? I did fine rubber fro the gas cap in the gas tank which was clogging things up... But thoughts on the misfiring and oily plug. I'm sure they are related.
Thanks in advance ,