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Spark Plug Help - 883 to Hammer 1275

  • BLKFLME
    BLKFLME
    4 years ago
    Hi all, anyone out there who has installed a 1250/1275 kit (S&S, NRHS, Hammer) in their 883 Sporty? Interested in what plugs you’re running and your experience running them. Could not find a thread on this?
  • tussuck
    tussuck
    4 years ago
    I recon it would be basedupon what Heads your running.  Differing manufactures could possibly run different threaded spark plugs etc so you may not find a 'one size fits all' answer.
  • BLKFLME
    BLKFLME
    4 years ago
    Fair call. I’m planning on running stock heads myself for this project. So anyone out there who has done the same or wants to offer their 2 cents, would appreciate it. FWIW was looking at running a set of NGK DCPR8EIX.
  • tussuck
    tussuck
    4 years ago
    So I have researched this when I was turboing....  You need to understand the desired temp range for the plugs to operate in (varies from head maker to head maker), the length of the plug and how far it extends into the combustion chamber and the material its made from - which really just defines the longevity as a rule.
  • BLKFLME
    BLKFLME
    4 years ago
    Cheers for the info Tussuck. Quite a bit to take into consideration here.
  • Krash Kinkade
    Krash Kinkade
    4 years ago
    you should contact Hammer as they can advise also if using stock heads would need to talk to them about what pistons to order. they give good advice. only trouble with the kits is no oversize pistons, so if you have trouble, could possibly be up for another set of barrels. just thought I'd mention.
  • Hoodeng
    Hoodeng
    4 years ago
    Use the original heat range, the after market heads will usually have the same plug as the original for the head 12mm [some after market evo heads are an exception as some went from 14mm to 12mm]
    Heat range is dictated by keeping the porcelain clean, [it needs to get to 400c to self clean]. Boosted applications will possibly need a std tip and colder plugs but this is when the engine is subject to continuous high load application.

    Cheers.
  • BLKFLME
    BLKFLME
    4 years ago
    Cheers for the input fellas. Appreciate it.
  • HOG63
    HOG63
    4 years ago
    Having this very discussion with Hammer Performance now. 
    • 883 heads, 1250 kit, 10:1 comp. 

    Hammer strongly suggest HD 10R12X Gold plugs (stock from a XR1200, part number 27794-08). 

    They also have a cold Iridium plug on their website, but not sure if suitable for the 1250 kit. 

    On another forum the NGK DCPR8EIX and DCPR9EIX plugs are said to be safe for Hammer kits. 

    The basic impression I get from Hammer is they have only tested the 10R12X plugs for detonation. 

    Seems they should test more plugs. 

    Some say a cold plug is not good, perhaps as Hoodeng points out. Which I guess leads to faster fouling. 

    A lower performing or fouled plug is better than detonation - damaging cylinder walls etc. 
  • HOG63
    HOG63
    4 years ago
    An interesting point is Hammer email stated they will no longer sell the Denso Iridium plugs. No explanation offered. 
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