Iridium IX plugs - Page 3 - Harley Forum

evoKENevo · #21 09-22-2009, 03:11 PM

Quote:

Originally Posted by Clayvis

and it is almost impossible to foul them out.

"Ah-ha-ha-ha"............................

PeterV · #22 09-22-2009, 03:39 PM

street bob · #23 09-22-2009, 04:16 PM

Clayvis... I have an 07 street bob and would like to know what the numbers were that you used to find the plugs for your scoot. I believe our motors are the same.
Thanks in advance....

diesel2 · #24 09-24-2009, 12:04 PM

Quote:

Originally Posted by PeterV

Hi Don,
Buddy has an 03 Heritage FI and uses them. No fault codes.
Mine is an 02 FLHT, carbed.
They're NGK DCPR7EIX

Diesel, Crappy Tire puts them on sale once in a while. Buy a pair, get a second pair free.

I wood never buy crappy tires two pack of spark plugs as they are second bests. Walmart etc., are likewise.

diesel2 · #25 09-24-2009, 12:15 PM

I will be replacing the latest Harley[NGK] SE plugs with NGK Iridium IX plugs as I never got a code before with them in but after some 30,000 km's the bike started to act up with the Iridium plugs and that is when I installed the lastest Harley plugs and that was a big mistake. The NGK Iridium ran great, much better then anything Harley has. I will change the NGK Iridium more often for sure.

diesel2 · #26 09-24-2009, 12:25 PM

Quote:

Originally Posted by mgmmgm

Hi,
So what irridium plug would work best in a 103 2007 fatboy with 9.8:1 compression?

Check out NGK Spark Plugs Canada as they are more up to date then the US site for some reason the last time and every time I check,

diesel2 · #27 09-25-2009, 09:00 AM

NGK Iridium IX plugs PN DCPR7E1X stock number 6046 retail here for $21.00 each, cost me some $ 11.00 each last night and will install this Sat., after the bike is cooled to room temp.. The gap on their site NGK.ca calls for .040 and the crappy SE ones were only .035 and the SE cost me more for a crappy running bike. As I understand larger gap makes for better fuel mileage and smaller for more power, but with the NGK Iridium being so much better,so you get both? Just checked the ngk.com site[US site] again and they are still out dated as they only show up to 2005 for FXD models 1450cc. I e-mailed them some time ago, but they are still sleeping and never updated their site or got back to me. The ngk.ca shows up to 2007 and is faster too.

chipster · #28 09-25-2009, 09:48 AM

In my opinion, a spark plug is a spark plug. It provides an area for which the spark to jump across. Not as evoKENevo says "rocket surgery".

diesel2, you state that the NGK website states to gap to .0040 and that the Screaming Eagles were gapped at .0035. Just a quick,yet maybe silly question ... What does your Harley service manual state? That's what you should refer to, in my opinion, and not an outside,aftermarket source.

PeterV · #29 09-25-2009, 03:48 PM

I used to think along the same lines.
.....until I saw my gas mileage go up and temp go down!

evoKENevo · #30 09-25-2009, 05:05 PM

Yo, Peter
You're one of the last guys I'd have expected to get that reaction from. If you got that kind of mileage & temp difference from just switching to Iridium plugs...you can bet the plugs you were running just were'nt quite right as far as heat handling and/or spark gap (adjustable w/in coil limits) etc, for your particular set up...and that you just happened to snag a set of Iridiums that are right...nothing more...nothing less

BTW in an earlier post here you wrote..."30kms more per tank. 20mpg"...and I'm not clear on the 20mpg part...typo, or kms to miles conversion, or what ???