Blue links below Are in PDF form you can download Adobe Acrobat here

Kohler 34-40 HP Brochure 34-40 HP Service Manual	Kohler Command 18-30 HP 18-30 HP Service Manual	Kohler Command 11-15 HP	Kohler Comand CS 4-13 HP Kohler Command PRO 7 HP
For replacement engines find the Model and Spec number on the Kohler ID Label