So far so good. I use them in a modified cloned 212 engine on a mini bike. The engine runs a little richer and idles a bit rough with the stock spark plug, but after I swapped it out for one of those spark plugs it runs much better and starts a bit easier too. I definitely recommend these "racing" connectors as an affordable and easy upgrade. The only problem, if you can call it that, is that the picture on the box does NOT match what the forks look like. never mind
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