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Author Message   Advoutlander Posted on Saturday, February 02, 2013 - 10:35 pm:        Which spark plugs do people recommend to use? Stick with the factory ones or should I change to a different type? Do the stock spark plugs require gapping or are they pre gapped?   Advoutlander Posted on Sunday, February 03, 2013 - 03:06 am:        By stock spark plugs I mean the ones that come in the HD packet. Part no. 27794-08.   Pontlee77 Posted on Sunday, February 03, 2013 - 04:40 am:        I like the iridium ones, some people say they don't notice difference, when my bike was stock, i did notice a slight difference, they are supposed to last longer, and cost double the price.   Advoutlander Posted on Sunday, February 03, 2013 - 04:43 am:        Are these the ones american sportsbike sell?   Pontlee77 Posted on Sunday, February 03, 2013 - 09:49 am:        yes, these: 5887 NGK Iridium, 10R12 Heat range Equivalent, for all Thunderstorm and XB - $9.95   Arry Posted on Sunday, February 03, 2013 - 01:15 pm:        I just got NGK iridium plugs at NAPA. $2.50 for regular NGK, $7.50 for NGK iridiums, so they are expensive. Haven't tried them yet, so I don't have an impression. I did have to adjust the gap slightly. I would check the gap on any new plug.   Hughlysses Posted on Sunday, February 03, 2013 - 01:38 pm:        Al Lighton cautions to be VERY careful if you adjust the gap on iridium plugs. The center electrode is so small it's very easy to bend which is not a good thing.   Teeps Posted on Sunday, February 03, 2013 - 03:38 pm:        My '06 has nearly 20k miles on a set of NGK Iridium plugs; bought from American Sport Bike. Hot or cold (ambient or engine), the engine starts and runs fine; still get 50 MPG consistently.   Thejosh Posted on Sunday, February 03, 2013 - 11:05 pm:        NGK Iridium   Whisperstealth Posted on Tuesday, February 12, 2013 - 02:34 pm:        I use the regular NGK's. 20K on them. Just pulled them the other day and cleaned them up(some light sanding) put'em back in. Bike runs great.

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