Try eBay or the dealer.
You should be able to find a owners manual at the following website: (courtesy Nissan dealership)http:/www.courtesyparts.com
The Yamaha company can direct you to the proper place to retrieve the owners manual for your Yamaha inboard. They may be able to send you a copy of the manual.
Your local Chevy dealer should be able to get you one.
You can get an owners manual at the dealer, salvage yard, ebay, and many other sites on-line. Search Google with the term, "Automobile Owners Manual". You can also purchase a Haynes or Chilton's repair manual at most auto parts stores, if you need detailed repair information. You may also be able to download an owners manual at Ford's web site.
The original manufacture of the Iver Johnson Model 55 Target pistol maybe able to provide an owners manual. The manual will have instructions on what is need to maintain the product.
Look in your owners manual. If you do not have an owners manual contact your local Kubota dealer and get one. You need an owners manual in order to be able to know what maintenance to perform and when.
My best guess would be Sears, of course. Try one of their service centers. You should be able to locate one on the inernet.
You can often get an owners manual for Craftsman products like a DLT 3000 from the Craftsman company or dealer. Sears sells Craftsman and may be able to order a manual.
Go to Google.com and type in: Liteon+LVW5006+manual. If it's available, you should be able to find one by that method.
You can go to ww.lincoln.com, click on owner, and register you and your vehicle. Then you are able to download the owners manual that you need, at no charge!!
If the manual did not come with the unit when you bought it then you should be able to download a Portable Document Format - PDF- version from the company website.
You might want to check out the Weedeater website. I was able to find and download a manual for my Weedeater line trimmer from there. Don't know if they would have one on the lawn tractor, but certainly worth a try.