When changing your spark plug, it is always a good idea to upgrade to an iridium spark plug. This will result in a cleaner burning engine, in return giving you slightly better throttle response. Performance gains are small (1%-3%), but bang for your buck, it is a no brainer. One of the biggest reasons to switch to iridium is they last about 10 times longer. (This is because it's melting point is 2500 degrees). This spark plug is designed for the Honda Metro and the Honda Ruckus.
