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Thread: I need some help to know what this spark plug color means. Pics inside!

  1. #1
    I just changed my plugs yesterday to the NGK 9's and pulled them today to see how my mods were doing on the A/F ratio. I not to good at this and would like a second opinion. I have the muffler mod(from member urban assault) and a K&N filter. The bike has been lightly tuned before I got it with ECMSpy. I will have the cable next week but want to know if this is safe to be riding on. Don't want to be too lean. Front plug is on the left. I've driven about 50 miles since I've put them in.



  2. #2
    Senior Member
    Join Date
    Oct 2011
    Posts
    540
    Quick question, did you check the gap on the plugs? When I bought my dcpr9eix the gap was way off. Some say they havnt had to and others say they did. Just wondering if you did. Thanks

  3. #3
    Yep, the gap was .030 so i put it to .038. I was mostly wondering about the all white insulator. There is no color to it, but i did only go 50 miles.

  4. #4
    Senior Member
    Join Date
    Apr 2012
    Posts
    613
    Why the 9's?

  5. #5
    Senior Member
    Join Date
    Dec 2009
    Posts
    1,307
    Why the 9's?
    9's are recommended for air cooled buells

  6. #6
    Senior Member
    Join Date
    Mar 2010
    Posts
    1,317
    That is the proper Heat Range for Xb Engines. The Stock plugs are ok if you can't find a NGK- DCPR9EIX.The Insulator is not really going to change in color all that much as long as it is Tuned properly and the Boot is covering the insulator properly.That is a large gap for that Engine. The Tip is easy to damage on NGKs.Ride Safe.*Jimi



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