Hello All, I bought a new sears craftsman 6.75hp ez-start lawn mower a couple weeks ago. I used it a couple times and the engine is producing a black soot all over the deck and all over my new white bag(which is now black!) I started looking around on the Internet for answers and no suck luck. I read a couple articles but I do not know how realiable they are. One mentioned adjusting the carb because it might be overly rich mixture? The model I have you cannot adjust the carb. [url]http://www.sears.com/sr/javasr/product.do?BV_UseBVCookie=Yes&vertical=LAWN&pid=07137657000&subcat=Rear+Bag+Mowers[/url] If anyone knows, please let me know. Thanks, Mike

I have a Briggs and Stratton 3.5 HP engine on my Murray Lawn Mower. It was smoking alot and I totally tore down the engine and put it back together and it doesn't smoke anymore, thankfully, and it runs fine. However, now it won't start with the air filter attached. If I remove the airfilter and attempt to start it, it will start and run great. However when I place the filter back on while still running, the engine chokes down rapidly and totally stops running after about 45 seconds. I've tried a new air filter, I have put a few drops of oil on the filter like it suggests, but nothing seems to make a difference. The Carburetor is non adjustable, no screws or anything to turn to adjust. There is a governor on the engine and I've tweaked it some, but even having the engine going full throttle makes no difference, it still chokes down to failure when airfilter is applied. . Any ideas as to the problem? Jonathan Tubbs