When Cat started using the BR9EYA they talked about it at the race school. The EYA has more surface area on the electrodes due to the grooves, so that reduces the chances of fouling. They also said the EYA is about a 1/2 step hotter than a BR9ES.
Br9eya vs br9es
What is the difference between these two plugs besides the groove in the electrode? The 9 tells me that the heat range is the same...why do I need to spend extra to replace the 'S' with a 'YA'??
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