Thread Last Poster Posts Pages Last Post Aftermarket plug wires? Chipmyers 11  1  03-07-15  08:20 pm Engine - Newbie Question re: sparkplug Buellistic 5  1  07-05-06  11:28 am "High Performance" spark plugs? Daddyblaize 70  3  09-29-15  10:43 am Spark Plugs Johneblast 39  2  11-13-11  12:30 pm Stumped on Sparkplugs! Milt 5  1  05-12-11  09:23 am Archive through July 02, 2009 Ezblast 30  1  07-02-09  09:35 pm Archive through March 27, 2008 Ezblast 30  1  03-27-08  09:18 pm Archive through April 10, 2006 Gearheaderiko 30  1  04-10-06  08:57 pm

Regular Spark Plug Gap 0.038" - 0.043"
Other plug types may differ
10R12A are the stock number for the Blast
for genereral cross reference and knowledge the following should help -
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
Iridium plugs still cross reference over to the older hotter 6R12 plug, if you cross reference using the NGK number for the 10R12 you get IX27B which is correct, and its racing version!
Note: the Blast, XB, and VRod share a special conotation on their plugs - 10R12A - the A stands for added sealing, these plugs will not back out if torqued in correctly, however, sooner or latter any aftermarket plug may need retightening - so please check your plugs tightness before any long trip - this is still advisable for stock as well - singles do vibrate after all;0)

Starting Diagnosis -
Please don't take this wrong. Is the kill switch in run? Fuel petcock in the reserve position? Fuel in the tank? First, does the motor turnover with the starter? If no check battery voltage at starter, large cable. If good then it's the low current circuit or the starter. If it's bad then it's the cable, connections or the battery. If it turns over the next think to check for is spark and fuel. Pull the plug reconnect the high voltage plug wire ground the plug on the head, turn the motor over check for spark. Caution I would not hold the plug or wire without a good glove. If the plug is wet with gas when you pulled it then you know that you have fuel and should change the plug. If not wet, then turn the motor over while twisting the throttle and smell for fuel coming out of the cylinder. Caution it may shoot mists of fuel out the plug hole. Hope this will get you started. If you don't have a Service manual please get one. Not an expert.

Author Message   Serpa Posted on Friday, July 03, 2009 - 03:34 pm:        Will one heat range make a huge difference? What is the 9 after the number?   Gearheaderiko Posted on Friday, July 03, 2009 - 06:35 pm:        Yes, it will make a difference, unless that heat range is more suited to your application. Posts moved to here: http://www.badweatherbikers.com/buell/messages/201 64/12758.html?1243481290   Thump Posted on Sunday, July 18, 2010 - 03:49 pm:        Took my bike in to get the tranny fixed. Which is why I was a little suprised to find out that they had replaced my desno iridium plug with a stock HD. When I inquired about the reason for this they told me it was b/c the aftermarket plug had some type of threading issues. I think it was that the plug had something on it that unthreaded itself in relation to the bikes vibrations. So IMO, the tech changed it out b/c it didn't say HD on it. (these are the same people that told me to plug up the second hole in the exhuast b/c it was letting too much air out!!!) Of course they couldn't find it. Next thing I know the service manager is out giving me the 3rd degree about aftermarket plugs. Quizzing me on why I changed in the first place. Asking me tech. questions on wire resistance, coils and what not. By the end of the conversation I was feeling like ya, why did I put this stupid aftermarket plug in anyways...I am such an idiot, where do I get off questioning the spark plug god? Seriously though, I was questioning if he was right. What if they don't really make a difference...I would feel a bit like a pompus ass insisting that they replace something that won't really make a diff. BTW last time I was out on a group ride more than a few commented on how they were impressed with my Blast's ability to keep up   Ezblast Posted on Sunday, July 18, 2010 - 06:36 pm:        No that Iridium plug is the correct heat range and size, and when one locktites the ceramic to the solenoid (will loosen due to vibration if you don't) and would/will out live the life of most HD vehicles. EZ   2hrcommute Posted on Sunday, July 18, 2010 - 07:34 pm:        EZ-locktite the what to the what? All I did was apply lite coat of anti-seize.   2hrcommute Posted on Sunday, July 18, 2010 - 08:09 pm:        Is the solenoid the terminal?   Gearheaderiko Posted on Monday, July 19, 2010 - 01:35 am:        No. On some/many spark plugs the tip of the plug that the wire connects to unscrews. On stock HD plugs this is one peice and it cant be removed. Aftermarket plugs often have this tip floating loose in the box and it must be screwed on. That where the Loctite comes in. Anti-seize on the threads going in to the head.   Gearheaderiko Posted on Monday, July 19, 2010 - 01:49 am:        Harley dealers often treat Blast riders (and Sportster riders) as 'bottom feeders'. They think you dont know jack, a newbie and treat you poorly. My guess is that you were getting the usual treatment They may have also been trying to sell you on always getting your bike serviced there. Spark plugs aren't that critical to wiring, resistance, coils, etc. and the plug manufacturers have done there homework when they recommend a spark plug for an engine. So there really is much worry there. At most they are usually only off on the heat range. If it was the $35 plug (and I think it was) I'd ask for my dam plug or get me another one. The only plausible comeback that would stick is that it would void your warranty. I think you're right. The tip came off and they lost it and replaced it with what they had in stock. The iridium racing plug (if its what I have) looks like an old non-fouler plug that they sold for cars (lawnmowers, etc.) burning a lot of oil. Maybe thats what the mechanic thought it was and replaced it. Sad, but possible.   Gearheaderiko Posted on Monday, July 19, 2010 - 01:51 am:        PS Great quote by Georgie Best! LOL!   Thump Posted on Wednesday, July 21, 2010 - 04:37 pm:        Thanks for the replies everyone. I'm pretty sure I did locktite the Desno ( I often follow directions in pretty good detail), but can't be for sure. Could the tip have come off while on the bike? What would have happened if it did? Great quote by a great man...are you a supporter Gearhead?   Gearheaderiko Posted on Wednesday, July 21, 2010 - 06:39 pm:        If the tip cam off it probably would've suffered from some missing or stopped running all together (if the wire came off). No, not a supporter, but he was an icon of the times as I, a young lad growing up outside London, when all we cared about was football. Dont watch it now as even the World Cup was in Spanish. A great quote I can relate to (on a smaller scale)! Forgotten most everything I knew now except one song that still sticks.. Good ol' Arsenal, we're proud to say that name.............. Dont hate me. LOL!   Britchri10 Posted on Wednesday, July 21, 2010 - 08:05 pm:        You can never hate an Arsenal follower. (You can feel sympathy for them though)LOL. Go Irons! Chris C   Gearheaderiko Posted on Wednesday, July 21, 2010 - 08:31 pm:        LOL!   Evilbetty Posted on Monday, September 27, 2010 - 12:50 am:        Free plug! http://www.advrider.com/forums/showthread.php?p=14 117025#post14117025   Ezblast Posted on Monday, September 27, 2010 - 12:59 am:        Nice find for somebody. EZ   Cvc Posted on Monday, September 27, 2010 - 01:11 am:        EZ how bout some tire advice CV check pm for phone#   Lostsurfer1771 Posted on Wednesday, October 03, 2012 - 10:12 am:        Is the denso IXU01-27 still the best plug out there? and is there any difference between installing that and a normal spark plug? I've only ever done it in a car. edit: I went to my local shop to see if they had it, they said no but they had ngk r2525-9 which is a direct replacement. can anyone confirm this? (Message edited by Lostsurfer1771 on October 03, 2012)   Gearheaderiko Posted on Wednesday, October 03, 2012 - 03:26 pm:        Dont bother with the NGK. They used to be great, but I installed a pair and they performed worse than stock plugs There isnt any difference in installation unless it has a special non-gapping tip. It will look much different and dont try to adjust the gap. Actually if it needs gapping you should probably send it back and get one that hasnt been dropped. Use ANTI-Sieze on the plug thread (not loctite).   Gearheaderiko Posted on Wednesday, October 03, 2012 - 03:26 pm:        Yes, Best plug (probably).   Lostsurfer1771 Posted on Wednesday, October 03, 2012 - 03:50 pm:        thanks. How can I tell if the gap is wrong? will it just not fit right?   Gearheaderiko Posted on Wednesday, October 03, 2012 - 04:22 pm:        If it looks like a traditional spark plug (like the one you pulled out) carefully check the gap. If it has the 4 prong electrode type then it isnt practical to check it.   Lostsurfer1771 Posted on Wednesday, October 03, 2012 - 04:28 pm:        Honestly I don't know what that means. Talk to me like a 5th grader lol.   Gearheaderiko Posted on Wednesday, October 03, 2012 - 04:38 pm:        Do you know how to check spark plug gap?   Lostsurfer1771 Posted on Wednesday, October 03, 2012 - 05:17 pm:        Nope my only experience is opening the box from advance auto parts and screwing them into my car. I'm trying to learn how to do as much work as I can on the blast but I've only been riding for a month.   Gearheaderiko Posted on Wednesday, October 03, 2012 - 08:12 pm:        Oh.You should always check the gap. Get a Blast repair manual and a generic "auto/motorcycle repair manual for dummies". Checking the gap is very basic and I'm horrible at directions. Spark plugs are gapped from the factory for the widest specific usage and may not be gapped for your vehicle. They also get dropped which will close down the gap. Always check the gap. I probably wouldnt buy the most expensive plug you can get. They can be fragile if mishandled. But you must use antisieze on the threads. Steel threads in an aluminum head (which is what the Blast has) will strip out if removed when hot and is a very delicate situation (metal wise). You should always use a torque wrench on anything that has a torque spec. Do you have to? No. I dont have to and I've been doing this a very long time, but I still use a wrench on most things that have specs. But that being said, I've learned what appropriate torque is (without a torque wrench) by stripping a lot of bolts. You can actually feel bolts right before the threads will strip or the bolt will break. But it can be a costly and time consuming way to learn. I hope thats not offensive and not meant to scare you. You may or may not have an aptitude for the mechanical. We'll do our best here to steer you in the right direction and help you out if you get in over your head. or you could just google.......   Lostsurfer1771 Posted on Wednesday, October 03, 2012 - 08:58 pm:        Don't worry I'm nearly impossible to offend. I have a service manual and I'm going to get a torque wrench this weekend, since it seems like I'll need one for a lot of work I'll be doing over the life of the bike. I'm pretty good at this kind of stuff but the last thing I want to do is screw the bike up by getting over-zealous, so I'm really glad you guys are around to help. It's much appreciated.   Lostsurfer1771 Posted on Tuesday, January 01, 2013 - 04:47 pm:        Got the iridium plug for christmas (also won a $500 gift card to revzilla.com, but more on that later). Bought a torque wrench and gap checker thingamabob today and just put it in. Took about an hour, and 20 minutes of that was me wrestling the gas tank off with no feeling in my fingers (it is january in NJ and all). Fired right up and sounds good, test ride tomorrow when it's a little warmer out, but I'm pretty darn proud of myself right now.   Ezblast Posted on Wednesday, January 02, 2013 - 12:38 pm:        Which Irridium plug? - you didn't gap the racing plug - right? EZ   Lostsurfer1771 Posted on Wednesday, January 02, 2013 - 12:46 pm:        I got the racing, but i just checked it was at the correct gap per denso's specs. which was .6 mm   Ezblast Posted on Thursday, January 03, 2013 - 12:46 am:        whew! - yeah - your supposed to send em back to the seller and get another if the gap isn't gaped, they are gaped by the factory only - lol EZ   Lostsurfer1771 Posted on Thursday, January 03, 2013 - 07:48 pm:        Yeah if I didn't look up the manufacturer's specs before I put it in I would have gone by the top of the page lol   Ezblast Posted on Thursday, January 03, 2013 - 09:28 pm:        lol - fixed it for you - EZ (Message edited by ezblast on January 03, 2013)

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