These are the common "6" Heat Range spark plugs used for the Honda B, D, & H Series Motors
These are the common "7" Heat Range spark plugs used for the Honda B, D, & H Series Motors
The are NGK "7" Heat Range Resistor plugs. These are different than the other NON Resistor
These are the common "8" Heat Range spark plugs used for the Honda B, D, & H Series Motors