Hi.... Just curious to see if any of you have or will switch your spark plug to Iridium . I have ordered one for my z125. If I can get over 61 mph, it will be because of the new plug. I will post any result I get with the new plug.
A test was done years ago about the iridium plugs... end result was, stick with the plug the vehicle was issued with. Iridiums threw the timing off on the vehicles that came with different plugs due to the iridums firing faster than the other plugs. With one cylinder and minimum hp, I see no benefit.
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Kawasaki Z125 Forum
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