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Old 11-15-2012, 09:52 PM   #1 (permalink)
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NGK Plug Question

My 91 440 Prowler calls for a BR9ES NGK plug. My understanding is that the BR9ES and The BR9EYA are interchangeable plugs. The EYA has a grooved tip that is supposed to reduce plug fouling. My question is does anyone here have first hand experience with the EYA plugs and did they find them better than the standard ES plug.
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Old 11-15-2012, 10:02 PM   #2 (permalink)
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I had a 90 Prowler and tried the EYA in that sled to keep the plugs from fouling. They fouled just as much as the ES ones did. I tried a few others, too. I finally adjusted the oil pump and plug fouling went to pretty much zero, even with the ES plugs. I still carried 4 spares, though
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Old 11-16-2012, 03:59 AM   #3 (permalink)
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I use Iridium BR9EIX plugs and they don't foul nearly as much. More expensive though.
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Old 11-16-2012, 05:39 PM   #4 (permalink)
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Stay with the BR9es plugs! The EYA's are harder to read!
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