Bikez.com maintains a discussion group specifically for the Yamaha XSR 155, where owners share maintenance tips and repair experiences.
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155cc, liquid-cooled, 4-stroke, SOHC, 4-valve with Variable Valve Actuation (VVA) Bore x Stroke: 58.0 mm × 58.7 mm Compression Ratio: 11.6 : 1 yamaha xsr 155 service manual pdf link
Tik shrugged. "Official dealer is closed for the holiday. You could order the book online, but shipping takes two weeks. You don't have two weeks."