HarleyTechTalk

Does anyone run these in their EVO?

A waste of money.
Stick with the stock HD plugs or an equivalent from one of the name brand manufacturers.

I have not run them in an Evo or TC, or any HD for that matter.

The main purpose of Iridium spark plugs is longer life. There is some advantages with the small center electrode, allowing a spark path with less voltage.

I've got NGK R 

BPR5ES-11 in my evo, stock ignition and compression

20k and counting on those with no issues to my knowledge

NGK i in all my motors

All my bikes except for one.
LOL
 
You cannot view this attachment.

NGK Iridiums in the '99 Evo motor in my'85 FXRS. Best plug I've ever run and that's based upon comparisons done while using the bike in a daily commuting situation. Same ride every day, close to 100 mi. roundtrip, every day, same route...mostly I-95 down here in Fla. Slight improvement in gas mileage was definitely observed. I routinely pulled them at 15,000 mi. "just because".
Necessary...absolutely not. I like to try stuff so over the course of the 39 yrs and 320,000 mi. I've ridden this bike...I've tried different things, just because. 

Whish ever plugs you use index them to the intake

Quote from: thumper 823 on February 17, 2024, 06:42:10 AMWhish ever plugs you use index them to the intake

What material shims are you using for indexing

Quote from: thumper 823 on February 17, 2024, 06:42:10 AMWhish ever plugs you use index them to the intake

Waste of time.

I use Nology wires and matching silver plugs from Nology, always great results .
Had those wires and plugs tested on a Buell , years ago , the guy who worked the dyno said plugs don't do anything....that setup showed 3 solid horsepowers gain over the standard setup with Accel wires and NGK plugs . You don't have to believe me ,i know what the dyno said . I don't have the sheet anymore,it's to long ago but i do know they work .

Quote from: fatbobber on April 06, 2024, 12:48:29 PMI use Nology wires and matching silver plugs from Nology, always great results .
Had those wires and plugs tested on a Buell , years ago , the guy who worked the dyno said plugs don't do anything....that setup showed 3 solid horsepowers gain over the standard setup with Accel wires and NGK plugs . You don't have to believe me ,i know what the dyno said . I don't have the sheet anymore,it's to long ago but i do know they work .

And WHY do you think that happened ? 
John

why index to intake? I face opposite side to spread flame, never heard of that wondered why.

Quote from: JSD on October 20, 2023, 11:18:01 PMNGK i in all my motors

Hey JSD, do you have a part No for the NGK's you use?
Cheers

Same as normal 
NGK part number but with IX from memory. 

I use DCPR7EIX which is factory pre-gap at 0.8mm (31 thou) but I have the supplier re gap them to 0.9mm (35 thou) before purchase.

You can also put a suffix on NGK Plug Numbers which specifies the gap in tenths of a mm.

A DCPR7EIX-9 has a 0.9mm (.0354") gap, other sizes available are -10, -11, -12, -13, -14, -15

Note: NGK do not recommend gap adjustment for precious metal spark plugs so it'd be best to get the correct plugs from the start or have the supplier gap them to your requirement before purchase.

If the supplier breaks an insulator during the re gap then it's his problem. 

I buy them 2 at a time from Harold who runs a Performance Club, performancelub.com here in Oz, he gaps them for me.

I collect catalogues and have NGK, Bosch, etc, on the shelf for reference, amongst a lot of other library material.

FYI a DCPR8E is factory pre-gap at 0.7mm (28 thou), a DCPR8EIX is factory pre-gap at 0.8mm (31 thou)

Evo is NGK BPR5EIX-11 got mine from Repco as i have trade account 

Quote from: JSD on September 10, 2024, 09:11:07 PMEvo is NGK BPR5EIX-11 got mine from Repco as i have trade account

What size gap is that one? Is that plug colder than the bpr6es?

Quote from: Deye76 on September 11, 2024, 04:49:42 AM

Quote from: JSD on September 10, 2024, 09:11:07 PMEvo is NGK BPR5EIX-11 got mine from Repco as i have trade account

What size gap is that one? Is that plug colder than the bpr6es?

a -11 is a 1.1mm gap which = .0433"

a BPR5 is hotter than a BPR6

Lower the number hoter in NGK plug gap is adjustable via earth strap with correct tool 

Thanks FSG and JSD.

Quote from: JSD on September 10, 2024, 09:11:07 PMEvo is NGK BPR5EIX-11 got mine from Repco as i have trade account

Thanks JSD.
Just curious, why the larger gap?
Cheers

Quote from: FSG on September 10, 2024, 08:54:12 PMI use DCPR7EIX which is factory pre-gap at 0.8mm (31 thou) but I have the supplier re gap them to 0.9mm (35 thou) before purchase.

A DCPR7EIX-9 has a 0.9mm (.0354") gap, other sizes available are -10, -11, -12, -13, -14, -15

Thanks FSG,
What's the difference between the DCPR7EIX and the BPR5EIX ?  Are they both NGK plugs?

Fits other vechiles . Adjust to your liking. Now the difference is the D fits TC smaller OD" thread . And both are NGK.