Doesn’t smoke, or knock. Except for the muffler. We did install a new oil filter. Motor was removed from a John Deere L120 with 319 hours. Numbers on the motor are: Model 406777, Type 0139 E1, Code 040112YG. The item “John Deere L120 20HP V-Twin Briggs and Stratton Intek Motor” is in sale since Sunday, June 05, 2016. This item is in the category “Home & Garden\Yard, Garden & Outdoor Living\Lawnmowers\Parts & Accessories”. The seller is “blellis84″ and is located in Dover, Delaware. This item can be shipped to United States.