BOSCH SPARK PLUGS FOR VTX1800? - Page 4 - VTXOA
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post #31 of 36 (permalink) Old 10-21-2016, 09:17 AM
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I use the NGK IF6L11 an keep on rolling!
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post #32 of 36 (permalink) Old 10-21-2016, 09:36 AM
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Before I knew any better, I too replaced the stock plugs w/ 5K+ miles on them, with the Bosch 4419. I actually bought 8 plugs when they were much cheaper. Had good service with them so far, but knowing what I now know, would have saved my $$$ by staying with the NGK Iridium.

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post #33 of 36 (permalink) Old 10-21-2016, 09:40 AM
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To confuse the opinion polls...Bareasschoppers has a write up on "Spark plugs and the VTX 1800" also.
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post #34 of 36 (permalink) Old 10-21-2016, 10:23 AM
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So, why do they call them HOT & COLD plugs?
These are NGK IFR5L 11's, which I believe AREN'T OEM spec, do they look OK (only took out rear cylinder)
or is it wise (& expensive) to change them to the OEM spec?.......My engine seems to run VERY hot always!

Last edited by Britabroad; 10-21-2016 at 01:19 PM.
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post #35 of 36 (permalink) Old 10-21-2016, 02:26 PM
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Quote:
Originally Posted by Britabroad View Post
So, why do they call them HOT & COLD plugs?
These are NGK IFR5L 11's, which I believe AREN'T OEM spec, do they look OK (only took out rear cylinder)
or is it wise (& expensive) to change them to the OEM spec?.......My engine seems to run VERY hot always!
Hot or cold refers to the temperature at which the electrodes operate. This is determined by the length of the ceramic cone that supports the center (usually positive) electrode. Longer cone means longer path for heat dissipation= hotter. Shorter cone means more rapid heat transfer= colder.

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post #36 of 36 (permalink) Old 10-21-2016, 02:38 PM
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Quote:
Originally Posted by Jimbo View Post
Hot or cold refers to the temperature at which the electrodes operate. This is determined by the length of the ceramic cone that supports the center (usually positive) electrode. Longer cone means longer path for heat dissipation= hotter. Shorter cone means more rapid heat transfer= colder.
Doesn't shorter cone means smaller surface = slower heat transfer?


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