Guessing how tight to fasten a cylinder head bolt or an axle nut can lead to catastrophic failure. The manual provides exact torque specs (e.g., "Cylinder head nuts: 18–22 Nm"). Under-torquing leads to oil leaks; over-torquing strips aluminum threads.
provide standard 125cc maintenance schedules and torque specs.
To extend the life of your HB 125 past 5,000 miles, follow this schedule extracted from the official service intervals: