I have a B&S engine model number 350777-1137-E1 on my JD LX288 and have been running into some issues. I was mowing the lawn last week and the mower slowed down and had a lack of power. I stopped mowing and then took the air cleaner off the engine, and it immediately started to run better. I then noticed that there was some misting gas coming back out of the carb. I also noticed the air filter was wet with oil and gas.
I pulled the carb and everything looked OK but cleaned it the best I could with carb cleaner and air. I did not see any dirt or restrictions in the small holes.I checked the float and there did not seem like any gas was in the float and it felt light. The needle also seemed to look good. when the needle is closed, I could not blow any air through where the fuel line would connect, but with the needle open there did not seem like any restrictions and I could blow air through it just fine.
I adjusted the vales to .005 and also checked compression, which is good, and then disconnected the fuel pump and ran the engine with a few squirts of starter fluid. I did not see any starter fluid come back out of the intake, so this should eliminate the engine being a problem and only point to the carb.
After cleaning the carb and putting it back together (I did not make any adjustments to the settings while I checked the float and needle), I started the mower without the air cleaner on, but it would now only run with it half to three quarter choked. I sprayed carb cleaner all around the outside of the card suspecting an air leak, but their was not a surge in RPMs. This should eliminate a too lean condition and air getting in somewhere and needing to be choked.
At this point I thought I should spend the $150 and just get a carb rebuild kit as I already have a new air filter. I pulled the fuel line again to run the engine to burn up the remaining gas in the bowl. When I did this, I had the engine choked once again, but after about 30 seconds to a minute the engine smoothed out and I let go of the choke and it ran just fine without the choke for another 3 minutes or so until all the gas was gone and the engine stopped.
At this point I am a bit confused. It seems like I am seeing both a lean condition needing to keep the engine choked, but a possible flooding condition with too much gas after I disconnected the fuel pump.
Before I spend $150 on a rebuild kit, would this seem to point to the carb needing to be rebuild, or a potential fuel delivery issue? When I had the fuel line disconnected from the carb and cranked the engine, a bunch of gas did come out ans spilled everywhere.