Those projected center electrode plugs are for vehicles with larger combustion chambers that have trouble with shorter reach plugs.
I'd use the 2-Stroke racing plug with the solid tops if you're searching for something better than stock. They're made for racing and have a deep seated copper core with a wider heat range which is more resistant to fouling. Also they have the fine-wire center electrode which provides better sparking and enhanced ignitability.
huh,good info.I really like the 7 plugs,they seem to burn through sunkin water filled motors on the beach much faster and get you back in the surf faster with at least 2 less flip overs in the sand.ill search the race plug in a 7
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