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post #1 of 20 (permalink) Old 10-22-2011, 09:41 PM Thread Starter
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spark plugs

I have a 2007 1200 nightster and I would like to replace the plugs that are in her. Can anyone recommend a good spark plug. Thanks much

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post #2 of 20 (permalink) Old 10-22-2011, 10:06 PM
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Sparkplug Cross Reference Chart

'05 Carbed Night Train
111 rwhp, 112 rwtq
Best 1/4 ET 12.557s
Best 1/4 MPH 108.59
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post #3 of 20 (permalink) Old 10-23-2011, 12:58 PM
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If stock...just use the OEM plug.
I recall there are inexpensive at $2.50 each.

If not stock, you'll have to do plug reading for heat range choices.

Exotic metal plugs only increase plug life (from reduced wear).

There seems to be no evidence of increased power from any plug.

However, indexing Harley plugs is very easy and offers better fuel igniting.

CLIFFS - OEM plug (if stock) w/ indexing is best.
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post #4 of 20 (permalink) Old 10-23-2011, 01:16 PM
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How is indexing a plug easy? ... if you need a dyno ?
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post #5 of 20 (permalink) Old 10-23-2011, 01:19 PM
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Quote:
Originally Posted by KENNY94945 View Post
Exotic metal plugs only increase plug life (from reduced wear).

There seems to be no evidence of increased power from any plug.
Agreed.

However, the Iridium plugs will create a spark easier in high compression conditions due to the thin tipped electrode without reducing the spark plug gap.

'05 Carbed Night Train
111 rwhp, 112 rwtq
Best 1/4 ET 12.557s
Best 1/4 MPH 108.59
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post #6 of 20 (permalink) Old 10-23-2011, 01:20 PM
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Quote:
Originally Posted by StBobber View Post
How is indexing a plug easy? ... if you need a dyno ?
Don't need a dyno to index a plug.

'05 Carbed Night Train
111 rwhp, 112 rwtq
Best 1/4 ET 12.557s
Best 1/4 MPH 108.59
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post #7 of 20 (permalink) Old 10-23-2011, 01:31 PM
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Then how do you measure the supposed 'gains' ?
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post #8 of 20 (permalink) Old 10-23-2011, 02:24 PM
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indexing plugs simply means positioning the gap in the plug towards the inside of the combustion chamber
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post #9 of 20 (permalink) Old 10-23-2011, 02:34 PM
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indexing plugs simply means positioning the gap in the plug towards the inside of the combustion chamber
Isn't this only used for high performance racing engines? And that it has little effect on most engines -- especially stock engines?
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post #10 of 20 (permalink) Old 10-23-2011, 02:41 PM
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I personally don't think that it really matters at all. Have never done a mileage test or anything like that. Most people don't even think about it when installing a set of plugs. I have heard many people mostly hot rodders and racers swear by it. Aint no way you gonna be able to tell it from the seat of your pants, bu tit would be interesting to know if it has any fuel mileage benefits.
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