What does a Resistor do in a spark plug ? And why wont my bike start ?

James F

New member
Ive changed my old spark plug "BR7HS" with a "B7HS" And now the bike wont start.
Ive been told the "R" stands for Resistor. What does this do and why is it effecting my bike ?
Ohh btw I have racing rollers and racing exhaust on it.
 
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