| Author | Message | ||
     Sgthigg |
Can we try to consolidate a list here of spark plugs pn#'s and theyre heat ranges,with respect to the stock plug? I think this would help some of us (mostly probaly me lol)out in the future. I have used the search function but there is bits and pieces everywhere..I have left that route knowing probaly less..lol Please lets try to post as many as possible under this thread name as possible. | ||
| Typeone |
Here's a list I've been keeping in a separate doc, 'hotter' or 'colder' heat range is based off the stock HD plug. Hope it helps, if something looks incorrect let me know. ----- Harley 10R12A NGK DCPR9E (2641) .024 Gap NGK recommendation 5/8" NGK DCPR8E = hotter NGK DPR9EA-9 (3375) - threaded cap? 3/4 hex? NGK DCPR9EIX (2316) Iridium 5/8" Denso IXU27 (IXU24 = hotter) Autolite 4162 (4164 = hotter?) Champion RA6HC (hotter) ----- DPR9EIX-9 (5545) ....12mm, 3/4" reach, 18mm hex DOES NOT FIT DCPR9EIX (2316)...12mm, 3/4" reach, 5/8" hex ------- Buell 27661-00Y (10R12) (Supersedes old/hotter 6R12 OEM plugs) NGK DPR7ea-9 hot (not recommended) NGK DPR8EA-9 medium NGK DPR9EA-9 cool (equivalent to Buell 10R12) DCPR same except socket size | ||
| Buellistic |
Sgthigg: Champion(sold as H-D plugs at DEALER)... Part #-Stock#---Harley-Davidson-Wal-Mar RA2HC--900(cold) RA4HC--905 RA6HC--809------10R12 RA8HC--810(hot)-6R12---------------8810 As lean as the XB's are set up you could run the RA4HC or RA2HC depending on how the plugs look for front/rear cylinders ... DO YOU KNOW HOW TO READ SPARK PLUGS ??? | ||
| Sgthigg |
This is great guys... Awesome work Are all these gaps .040? Buellistic.. I know how to read them for the most part( im no buell/ase cert mech or anything) I have changed em out plenty enough on autos in my life..I didnt realize how lean these bikes run stock..wow when compared to older autos..I thinking about going to a cooler plug..less knock on hot days hopefully. I posted that pic the other day to see what kind of feedback is out there..I think my plugs are good..as per the manual for the most part.. Im gonna replace them now I got 6k+ on em In a high performancr motor it doesnt hurt to swap em out and keep her happy, especially for only a couple bucks..time for them to go... Typeone i read this on your profile. 1000mi - checked/corrected static timing to alleviate the consistent ping at ~3800 - 4000RPM. set a little advanced from factory. a slight ping still remains in a narrow band around ~4200RPM. running 93 pump gas. NGK Iridiums on order, testing a colder plug for ping. How did the cooler plug help out..i go the spec ops pipe and race ecm/filter..it runns awesome above 3k but belowk...she pings. I am planning on the same thing and was wondering how it worked for you ...Think it running advanced could cause the bike to use oil alot? Thanks guys (Message edited by sgthigg on April 10, 2006) (Message edited by sgthigg on April 10, 2006) (Message edited by sgthigg on April 10, 2006) | ||
| Buellistic |
Still running the OEM stock IGN. and adjust my plug gap to 0.030 in. ... | ||
| Typeone |
Sgthigg: they didn't  but they're great plugs. i dont think you could foul those suckers if you tried. i haven't gotten rid of the ping in hot weather yet. just got new plug wires and O2 sensor to throw on this week. new fuel pump is most likely in my future as well. i'ma gonna hunt that ping down if it kills me! my bike has always used about the same amount of oil whether the static timing was off a little or not. it was advanced from the factory and retarded by me a few times. finally just had a very good tech set it to factory spec and left it alone. changing the static timing messes with the fuel delivery/curve and i want that intact. the comments you'll read like 'retard the timing a little to aid ping' worked more for the tubers than the fuel-framers i think. at least it did nothing for my ping in the summer. so where i'm at is either a fuel delivery problem (pump cant keep correct pressure) or maybe lots of carbon deposits with all the TFI tweaking, fuel additive testing, etc. still no clue so i'll keep hunting. | ||
| Mesafirebolt |
Harley 10R12AG (Thats what the Dealer sold me this week end)There gold plated inside or so the price tag said! | ||
| Daveinm |
>>Champion(sold as H-D plugs at DEALER)... >>Part #-Stock#---Harley-Davidson-Wal-Mar >>RA2HC--900(cold) >>RA4HC--905 >>RA6HC--809------10R12 >>RA8HC--810(hot)-6R12---------------8810 >>As lean as the XB's are set up you could >>run the RA4HC or RA2HC depending on how >>the plugs look for front/rear >>cylinders ... What do you mean by hot and cold? Outside temp? I just picked up some RA8HC's. It looks like other threads are recommending the RA6HC's. Which one's should I go with? | ||
| Dudeman |
Daveinm: " the term "hot and cold" as related to engine spark plugs. Normally, a hot plug is used in a cold engine — low horsepower, and a cold plug in a hot engine — high horsepower. In actuality, these terms refer to the plugs ability to transfer heat from its firing end to the engine cylinder head. To avoid spark plug overheating where combustion chamber or cylinder head temperatures are relatively high, a cold plug is recommended, such as in a high compression engine. A cold running plug has the ability to transfer heat more readily. A hot running plug has a much slower rate of heat transfer and is used to avoid fouling when combustion chamber and cylinder head temperatures are relatively low." So, since running lean increases combustion temperatures, it would be logical to run 'colder' plugs.... | ||
| Fullpower |
Do Not use those RA8hc..... too hot. the factory gave a memo several years ago. If you want to use champion (nothing wrong with that, they work fine) use the RA6HC. | ||
| Vanvideo |
I went to the dealership to get a new set of plugs for my '03 XB9R. I have HD 10R12A in there now, as recommended by the service manual. The dealership gave me a Buell-labeled plug, B12P. I don't see this plug listed above. Will this work? Did the dealership give me the wrong plugs? Will the gap be the same, or can I trust the pre-set gap? I sure don't want to re-install these things again. It's a pain in the ass. |
