Tony Ferrari wrote:
I recently fitted one in my 450EXC before racing in the Tour of Portugal, didn't notice the slightest difference!
And I raced the same event with a standard NGK plug and had no issues either, just like the previous 8000 miles of green laning and racing.
Save your money fit what the manufacturer recommends. It's spent £100s of thousands on engine development. Do people really believe that they would have missed a trick to extract that extra few donkeys from the engine!!!!
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