Use the cheapest plug you can. Take the time to gap them correctly and change it out a couple times a year and you will never have a spark plug problem.
man you change your plugs a couple times a year? in my old XR250 i ran NGK and even a Splitfire and i can get 2 years easy out them no problem. and yes standard NGK is just fine.
Plug straps bouncing around in the combustion chamber can be loads of fun.
The weakest part of a plug is the strap, and with extended use the chance of the strap failing grows. Exponentially with a spitfire plug...but I won't go there....
OK, so time may not be the best judge. Take periodic looks at the strap, and when the sharp corners start to round off, it is time for a new plug.
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