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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Troubleshooting (Poor Starting/Running/Handling/Ride Issues) » Archive through February 05, 2015 » Spark plugs « Previous Next »

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Monsterron
Posted on Thursday, July 03, 2014 - 09:49 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Is a NGK DCPR9EIX a good plug for a 07 Ulysses? Thank You
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Gabby_duck
Posted on Friday, July 04, 2014 - 05:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
http://www.ngksparkplugs.com/part_finder/motorcycl es/step4.asp?id=637&type=ir
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Readyxb
Posted on Saturday, July 05, 2014 - 11:20 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
In addition to Gabby_duck's link, the stock H-D brand spark plugs are 10R12X and do work great. The insulator nose has a special "mushroom" design that is intended to help burn off carbon deposits better than the standard design and to resist fouling.

NGK #4179 DCPR8E are the affordable direct replacement.

NGK Iridium #6546 DCPR8EIX are premium direct replacement and should last longer.

The DCPR9EIX plugs you are looking at are 1 step colder - not really needed for most applications, but many (including me) have had no issues. If you go that route, I would suggest checking for carbon buildup on the insulator periodically - that can happen if the insulator doesn't get hot enough!
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