Ever wondered what the difference is between a spark plug with an internal resistor is when compared to the older 'non' resistor type?

Well, I have been curious for some time to investigate how, if at all, the HT voltage (spark voltage) is affected by these 'newer' plugs.

After a little research I felt compelled to find out for myself & with the ideal motorcycle on the hoist now seemed the perfect time....

Andy Mechanic