| Author | Message | ||
     Oinkster |
I've got a 1999 M2. It's been running great but I decided to put some new plugs in so I removed the H-D 6R12 and put in NGK DCPR8EIX (Iridium). I've seen these plugs recommended for my bike on here so I thought I'd give them a try. A mile out my bike started back firing out the carb and then lost power until it died. I pulled over and it fired right up so I took off but by the time I hit 3rd it did it again. I limped it home with it back firing but it ran all the way. Put the old plugs back in and it runs like a champ again. The NGK plugs turned a yellowish brown color. Any Ideas why?  | ||
| Bluzm2 |
You should be running 10R12's or equivalent. The 6R12's were changed back in 2000 or so. A 6R12 equivalent is too hot (or is it cold??? pretty sure it's hotter). | ||
| Daveswan |
I run the NGK DCPR9EIX (equivalent to Buell 10R12) in my M2 with no problems. Did you torque them? the crush washer doesn't look like it's been compressed much. They should have run better than what you've described so I'm trying to think of other things that aren't as obvious like tight boot, full seated plug, don't gap them etc. | ||
| Buellistic |
TORQUE "SPEC's" are 12 to 18 ft.lbs. ... My spark plugs stay tight at 12 ft.lbs., so there is no reason to torque more ... | ||
| Ratbuell |
Why reinvent the wheel if you don't have to? Run 10r12's, gap and torque them properly, and you get to....ride, smile, and repeat  | ||
| Oinkster |
Daveswan no I didn't torque them. I'm in Fayetteville AR at Bikes Blues & BBQ so I did't have many tools, so that might be it. Ran great all day so maybe Ratbuell is right, don't fix what ain't broke. Thanks for all your help.  | ||
| Daveswan |
The reason I ask is that once I just put my new plugs in without a torque wrench and i thought they seemed tight. Then I remembered the crush washer so I decided to get the torque wrench out to make sure. I torqued them to 15 ft.lbs which is half way between 12 and 18. To my surprise I hadn't seated them correctly by wrench alone - had plenty more to go. So essentially whether you run 10r12s or EIX versions of the same thing doesn't really matter if they aren't in the way they're supposed to be. You won't gain any performance benefit anyways unless you need them to fire in oil (2-stroke motocross) or in high-compression nitro methane dragster. They just last a long time for regular use so you don't have to change them nearly as often. Providing they work at all which they should since they're essentially the same thing with only the tip being made out of the hardest element on the planet. Man, I would love to be at a BBQ! -cheers! | ||
| Gypsey |
The standard plugs r not available, they have been replaced by the same plug they use in the nightrods, use a platium tiped as the std plugs arnt worth the $$$$. | ||
| Buellistic |
BUELLers: Lets cut the chase on "SPARK PLUGS" !!! CHAMPION makes the spark plugs for HARLEY-DAVIDSON ... Here is the CROSS REFERENCE to where you can buy at your local AUTO PARTS Store ... HD6R12 same as CHAMPION RA8HC STOCK #810 The "WAL-MART" part number is 8810 !!! HD10R12 same as CHAMPION RC6HC STOCK #809 In the AUTOMOTIVE WORLD the the lower number on the spark plug is COLDER and the higher number is HOTTER ... In HARLEY-DAVIDSON's effort to confuse the issue, they reversed to SYSTEM making the high number colder and the low number hotter ... WHY IN THE WORLD WOULD ANYONE WANT TO RUN SPARK PLUGS THAT CAN NOT BE BOUGHT AT THE LOCAL AUTO PARTS STORE !!! If you are looking for even colder spark plugs, ask for RA4HC stock #905 and/or RA2HC stock #900 ... | ||
| Fuzzz |
"In the AUTOMOTIVE WORLD the the lower number on the spark plug is COLDER and the higher number is HOTTER ... " Except for NGK... | ||
| Buellistic |
Thought NGK was a AUTOMOTIVE SPARK PLUG ??? "OOOOOOOOOOOOooooooooo well", BWBers is a never ending learning machine .... | ||
| Fuzzz |
I wasn't being sarcastic, I just wanted to point out that NGK plugs numbering system works backward, with the smaller number in any series (BP7ES) being the hottest and the larger numbers being cooler(BP9ES), Versus Autolite, for example, where a 4164 is hotter than a 4162. Unfortunately, I find myself making a living from cars...again :-( Personally, I use the NGK JR9C's in my M2, stock #6193, at the recommendation of a tuber racer from Florida, and I've been extremely happy with them. (Message edited by Fuzzz on October 06, 2010) | ||
| Imadog |
It has to do with Japanese plugs versus American Plugs. Japanese the higher the number the colder the plug. American the higher the number the hotter the plug |
