using a CR7HSA will give you a smaller spark,
but it's not really that noticable unless your bike is race prepped.
Stu,
the ignition needs a slight resistance to fire the coil, so you either use a spark plug cap with the resistor or a spark plug with a resistor.
it is the cap on the end of the lead, most pit bike ones have a built in Resistor, they are usually stamped 5K (5000 Ohms) on them.
this is the correct Spark Plug Cap to use with a Resistor Spark Plug- 1X NGK None Resistor Spark Plug CAP LZFH Black 8710 | eBay
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