Hi just changing the spark plugs on my new 749 track bike and took out ngk cr9eix iridium plugs. Are these the best plugs for these bikes? Many thanks
Having tried both I didn't notice a difference either way. Iridium will last upward of 10k miles easily, just don't alter the gap on new iridium plugs, they are preset. The bad press comes when a dufuss alters the gap and wonders why the spark is awful.
