ORIGINAL: MassiveMods
I gues the heat from the engine can help the plug continue to glow as is the nature of glow ignition..
That is exactly how the plug works
CH3-NO2,
Get a timer if you don't have one built into the radio, most engines will run between 6-9 minutes on a 125cc tank, depending on conditions. If you came in every 5 minutes, you'd be fine.
A lean run out isn't only bad for the plug, it's bad for the motor too