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The tips of the Iridium plug are harder than other plugs, so they last a little longer and require lower voltage to ignite the air/fuel mixture. Iridium plugs also fire better with the right performance ignition coil and can increase performance better on bikes with an EFI System or High performance upgrades (pistons, carbs, cams etc..). Without a better ignition coil on the stock carbed version of the Ninja 250, you will still get about the same quality spark as from a standard tip plug. You won't even notice the difference.
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