Complete tune-up for a Yard Machines 21" lawn mower with a Briggs & Stratton 675EX engine, including an oil change. Complete tune-up for a Yard Machines 21" lawn mower with a Briggs & Stratton Model Number : 12AA0A9778. Mow with less effort using a durable Brute 21” front wheel drive, self-propelled lawn mower. Reliable Briggs & Stratton 163cc 675exi engine features a ReadyStart™ System that helps start your lawn mower in 2 pulls or less without priming or choking the engine. You'll never have to change the oil, ever with the Remove the oil fill cap and slowly tip the engine and machine onto its side so that: A) The oil fill port is pointed down toward the used oil collection container. and. B) The air filter and carburetor are positioned up and away from the ground. DO NOT tip an engine so that gravity may force oil into the air filter and carburetor. Options. If the mower fires and then dies out, or, the mower runs however begins to loose power and dies out drop the 1/2" bolt that holds the carburetor bowl assembly on - use either a box/circle wrench or 1/2" socket. Remove the bolt from the bottom of the bowl and make sure not to loose the plastic washer for the bolt. The Briggs & Stratton 675EXi is a low maintenance engine that powers many lawnmowers and string trimmers. It's a 4-stroke engine but has no filter and requi 591040. .030”. If you have a Quantum engine, be sure to check the Code Date before doing any engine maintenance. Find your small engine model number, code date and more. Replacement Part Type. Briggs & Stratton. Spark Plug Part Number. Spark Plug Gap. Resistor used on Vanguard models 050032 and 086400. The Briggs & Stratton 84002441 Lawn Mower Tune-Up Kit can be used on most Ex and EXi series Over Head Valve engines using a paper air filter.. The kit is used for maintaining your Briggs & Stratton lawn mower. Help keep your outdoor power equipment running at peak performance and avoid costly repairs by ordering Briggs & Stratton replacement Carburetor for Briggs & Stratton Lawn Mower Engine Replace OEM Part # 799584, 592361, 594057, 594058, 594529 Fits Husqvarna LC121P,550EX, 625EX, 675EX, 725EXI 140cc Engines,Toro 550ex 140cc mower. 123. 200+ bought in past month. $1699. FREE delivery Thu, Jan 4 on $35 of items shipped by Amazon. 1b5g.