1" diameter x 3-5/32" length vertical crankshaft. Keyed, drilled & tapped 7/16-20. Does include fuel filter and oil filter. Does not include muffler and gas tank. Please note, if you should have any problems with engine after installation and start-up you will need to contact your local Kohler dealer.The item "Kohler Courage Lawn Mower Engine Model SV601-3250 20HP 12 amp alternator" is in sale since Wednesday, October 21, 2020. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Lawn Mowers, Parts & Accessories\Lawn Mower Parts". The seller is "discountoutdoorparts-com" and is located in Basehor, Kansas. This item can be shipped to United States.