Finding the official Yamaha XSR 155 Service Manual as a PDF can be a bit tricky since Yamaha often restricts these to authorized dealers. However, you can usually find the Owner's Manual
A quick Google search for "Yamaha Xsr 155 Service Manual Pdf Free Download" will lead you down a rabbit hole of torrent sites, sketchy file-sharing forums, and low-resolution scans. While the urge to save $50-$100 is understandable, there are significant risks: Yamaha Xsr 155 Service Manual Pdf
Visit your local authorized Yamaha dealer. Provide your VIN (Vehicle Identification Number). They can order a physical printed copy (expensive and heavy) or sell you a digital USB/license. Prices range from $60 to $120 USD. Finding the official Yamaha XSR 155 Service Manual