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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 and about 7 7/8 in long. The K181 rod is 4 inches (crank pin to wrist pin) center to center and about 7 1/2 in long. 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. Top ring, middle ring and the one piece oil ring. Wrist pin and Keepers. CONNECTING ROD COMES IN : Standard. Anybody can Rebuild a Kohler engine themselves. Piston and Rings 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 and. 010 is 1.176. Head is 15 to 20 ft lbs and the rod is 140 inch lbs. (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 FEEDBACK’S. The item “7hp Kohler K161 engine rebuild. 7hp Kohler, Hard to find parts” is in sale since Tuesday, August 14, 2012. 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.

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