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Old 09-18-2008, 02:45 PM   #8 (permalink)
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De Yaris - '04 toyota yaris T2
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Try a ball nose on the plug. Plugs seem to to want to wear to this shape so you could just form te tip to that shape.
I wouldn't worry about burning a hole in the piston. Detonation will cause that. You may find yourself having to adjust the timing to take care of the fact that the fuel is igniting that little bit quicker.

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