Re: What do i need to know to replace my spark plug?
Before you change the sparkplug, make one last full throttle blast down a flat road, kill the engine, then pedal home. Make sure your engine is stone cold, before removing the sparkplug. Install new sparkplug.
Now look at your old sparkplug. Is it black, brown or white around the electrode? If it's brown, leave your engine alone. If plug is black or white, then carb tuning might be in order.