That night, under a flickering tubelight, Arjun became a monk. Section 4-12: Valve clearance adjustment . He’d never touched a shim in his life. Section 7-18: Oil pump rotor inspection . He didn’t even own a micrometer.

But the V4 was his dream. The liquid-cooled 155cc, the Deltabox frame, the VVA—variable valve actuation—that made it scream past 7,400 rpm. He just needed to resurrect it.

Arjun didn’t just fix his bike. He learned to read the language of engineers. The manual became his grimoire. He tabbed every page, highlighted every NM torque value, and even laminated the oil flow diagram.

On race day at the MMRT track in Chennai, his R15 V4 kept up with stock bikes three times its price. When a fellow rider asked his secret, Arjun smiled:

The previous owner shrugged. “No manual. Just vibes.”

But page 201 changed everything: a tiny footnote in red— “If engine knock persists after cam chain tensioner replacement, check the VVA oil pressure control valve. Clean with compressed air. Do not disassemble.”

The Gospel of the R15

Arjun spent three weeks sourcing parts from Coimbatore to Delhi. But the engine knock worsened. One night, after a disastrous test ride, the bike stalled at 90 km/h and refused to start. Desperate, he remembered a thread on Team-BHP: “The service manual is the Bible. Follow it, or walk.”