{"product_id":"2-piston-ring-sets-for-briggs-54-61-cu-in-v-twin-809972-kg-rdgf-20xo","title":"2 Piston Ring Sets for Briggs 54 \u0026 61 Cu In V Twin 809972","description":"\u003cp\u003eTwo standard piston ring sets for the Briggs \u0026amp; Stratton big block V twin. Replaces 809972, two sets supplied. QUANTITY. Ring set 809972 covers one cylinder. A V twin needs two sets, and two sets are in this box. One purchase completes the engine. SPECIFICATION Bore - 3.37 inch, 85.6mm, standard 54 cubic inch - 3.07 inch stroke, 896cc 61 cubic inch - 3.41 inch stroke, 993cc WHY ONE RING SET COVERS TWO DISPLACEMENTS. The 54 and 61 cubic inch big block V twins share the same bore and differ in stroke. Piston rings are sized to the bore, so 809972 is correct for both. Pistons are not interchangeable between them. MODELS. 540477, 541477, 541777, 542477, 542777, 543275, 543277, 543477, 543577, 543777, 54E177, 54E677, 610177, 611177, 611475, 611477, 612177, 613177, 613275, 613277, 613477, 613777 and the 61A series. IDENTIFYING YOUR ENGINE. These engines went into riding mowers, zero turns, lawn tractors, generators and log splitters across many equipment makes, so the number on the machine's own tag is the equipment maker's, not the engine maker's. Read the model number stamped on the blower housing instead. STANDARD BORE ONLY. If the cylinders have been machined, the .020 inch oversize ring set is 841932. Standard rings in an oversize bore will not seal, and once fitted they cannot be returned. BEFORE RE-RINGING. Measure the bore for taper. Beyond roughly .003 inch, new rings in the existing bore will smoke and pass oil regardless of how well the job is done, and the block needs machining and oversize parts. After honing, wash the cylinders in hot soapy water to remove machining grit before the new parts go in.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eTWO SETS IN THE BOX, ONE PER CYLINDER - Ring set 809972 is sold per cylinder, and a V twin engine needs two of them. Both are here, so one purchase does the whole engine. Manufacturer parts diagrams for twins are drawn per cylinder, which is why the same number often looks like it covers the engine when it covers half of it.\u003c\/li\u003e\n\u003cli\u003eFITS BOTH THE 54 AND THE 61 CUBIC INCH BIG BLOCK - Both share a 3.37 inch, 85.6mm bore. What differs between them is stroke: the 54 cubic inch runs a 3.07 inch stroke at 896cc, the 61 cubic inch a 3.41 inch stroke at 993cc. Rings are a bore part, so one ring set covers both families. The piston does not - those are different numbers.\u003c\/li\u003e\n\u003cli\u003eVERIFIED MODEL LIST - 540477, 541477, 541777, 542477, 542777, 543275, 543277, 543477, 543577, 543777, 54E177, 54E677, 610177, 611177, 611475, 611477, 612177, 613177, 613275, 613277, 613477, 613777 and the 61A series. Identify the engine by the model number stamped on the blower housing, not by the machine it came out of.\u003c\/li\u003e\n\u003cli\u003eSTANDARD SIZE ONLY - These are standard bore rings. If your cylinders have been cut, the .020 inch oversize set is 841932 and it is not what ships here. Measure or ask your machine shop before ordering, because a standard ring in an oversize bore will not seal and cannot be returned once it has been fitted.\u003c\/li\u003e\n\u003cli\u003eBEFORE YOU RE-RING - Check the bore for taper and glaze. More than about .003 inch of taper and new rings in the old bore will smoke and burn oil no matter how carefully you fit them - that engine needs boring and oversize parts instead. Wash the cylinders in hot soapy water after any honing to get the grit out before assembly.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lil Red Barn","offers":[{"title":"Default Title","offer_id":68009604776090,"sku":"KG-RDGF-20XO","price":69.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0397\/2346\/6909\/files\/615aOGyPLML.jpg?v=1793382460","url":"https:\/\/performancesawsupply.com\/products\/2-piston-ring-sets-for-briggs-54-61-cu-in-v-twin-809972-kg-rdgf-20xo","provider":"Performance Saw Supply","version":"1.0","type":"link"}