These are not paper manuals. These are PDFs of the manuals on a USB flash drive to open on your computer. A service manual may be needed to perform repairs yourself. It can be left on the flash drive and plugged into your computer when needed. You can download the files from the flash drive to your computer. You can print the complete manuals or sections of the manuals as you choose for review from your computer. Service Manual uses illustrations of the engine in the service manual for reference in troubleshooting and repairs. USB flash drive includes. Service Manual – 1683 pages.