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This is for all the large bore K161 engines including K161A, K161AS, K161AQS or any k161 with any suffix on it. Please note the cylinder chart below, kohler made the early small bore and the later large bore. If you have the small bore, they do not make that piston any longer. The K161 rod is 4 1/4 inches (crank pin to wrist pin) center to center. The K181 rod is 4 inches (crank pin to wrist pin) center to center. If you have the longer rod, you have a K161, if you have the shorter rod you have a 8hp K181. Numbers or models stamped on the shroud or block mean nothing, engine is determined by the bore and stroke and I clearly give you all the measurements above and below to defiantly tell you what you have. KIT INCLUDES TH E FOLLOWING. 1 New Piston : PISTON COMES IN : Standard. 1 set of Piston Rings. Top ring, middle ring and the one piece oil ring. Wrist pin and Keepers. CONNECTING ROD COMES IN : Standard only. 1 Complete Gasket Set. I need this information in order to expedite your shippment. When measuring cylinder bore, please measure the cylinder wall approx. 1 inch down the cylinder wall for correct measurement. 7 HP STANDARD Cylinder Bore 2.9375 or 2 and 15/16 inch +. 010 2.9475 +. 020 2.9575 +. Rod crank pin, Std is 1.186. I now also have the rod in. (MOST COMMON FAILURE ON A NEW REBUILT ENGINE IS IMPROPER ROD INSTALLATION), (The oil hole goes toward the cam). See my other auctions for tools, lawn, tractor seats and other rebuild kits. PLEASE FEEL FREE TO VIEW OUR FEEDBACKS. The item “Kohler K161 engine rebuild. 7hp Kohler” is in sale since Tuesday, July 23, 2013. This item is in the category “Home & Garden\Yard, Garden & Outdoor Living\Lawnmowers\Parts & Accessories”. The seller is “bakt4kids” and is located in Wauseon, Ohio. This item can be shipped worldwide.

• Brand: Kohler
• Model: K161
• Type of Mower: Riding Lawn Mower Tractor
• Lawn Mower Type: RIDING LAWN MOWER TRACTOR
• Power: 7 hp
• Item Condition: New
• Lawn+Mower+Type: Lawn+Mower+Parts+&+Accessories
• Make: for Kohler
• MPN: Does Not Apply
• Type: Engine