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  • BLKFLME Posts: 10
    Adelaide, SA
    Stock Poster BLKFLME
    11 Dec 2019 02:09 PM
    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 Posts: 2467
    Melbourne
    Motor Head tussuck
    11 Dec 2019 02:17 PM
    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 Posts: 10
    Adelaide, SA
    Stock Poster BLKFLME
    11 Dec 2019 02:31 PM
    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 Posts: 2467
    Melbourne
    Motor Head tussuck
    11 Dec 2019 08:05 PM
    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 Posts: 10
    Adelaide, SA
    Stock Poster BLKFLME
    11 Dec 2019 10:20 PM
    Cheers for the info Tussuck. Quite a bit to take into consideration here.
  • Krash Kinkade Posts: 2957
    Forum Legend Krash Kinkade
    12 Dec 2019 09:07 PM
    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 Posts: 226
    Stock Poster Hoodeng
    13 Dec 2019 09:38 AM
    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 Posts: 10
    Adelaide, SA
    Stock Poster BLKFLME
    13 Dec 2019 08:41 PM
    Cheers for the input fellas. Appreciate it.
  • HOG63 Posts: 247
    Stock Poster HOG63
    22 Jun 2020 10:45 PM
    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. 
  • lucifer_mr2 Posts: 446
    Stage 1 Poster lucifer_mr2
    25 Jun 2020 09:59 PM
    Guy I ride with needed spark plugs, local workshop put in some nice stock ones. Anyway after a few weeks of detonating and loss of power he changed them out to some colder ones to suit the work that was done to the bike (cams, carb, pipe, high comp, etc). I think he went with VRod plugs.
    I've just ran the Denso's I got from Hammer two years ago, good plugs. Might change them soon, getting towards that time.
  • HOG63 Posts: 247
    Stock Poster HOG63
    26 Jun 2020 10:31 PM
    Quoting lucifer_mr2 on 25 Jun 2020 09:59 PM
    Guy I ride with needed spark plugs, local workshop put in some nice stock ones. Anyway after a few weeks of detonating and loss of power he changed them out to some colder ones to suit the work that was done to the bike (cams, carb, pipe, high comp, etc). I think he went with VRod plugs.
    I've just ran the Denso's I got from Hammer two years ago, good plugs. Might change them soon, getting towards that time.
    An interesting point is Hammer email stated they will no longer sell the Denso Iridium plugs. No explanation offered. 
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