Harley Davidson Forums

EVO All Evo Model Discussion

Recommended spark plug ?

Thread Tools
 
Search this Thread
 
Old Jun 29, 2014 | 11:48 AM
Share
  #1  
Delawaredave's Avatar
Delawaredave
Thread Starter
|
Novice
Joined: Oct 2009
Posts: 24
Likes: 0
Default Recommended spark plug ?
Newbie. 1989 FLHS. I believe stock with exception of S&S carb.

Bought bike with Champion 5R6A plugs. This is also plug called for in service manual.

Just curious if anyone recommends any different plug specification (hotter or colder, iridium, etc - don't want to start a "plug brand debate")

Thanks !
 
Reply
0
Old Jun 29, 2014 | 12:00 PM
Share
  #2  
Uncle G.'s Avatar
Uncle G.
Seasoned HDF Member
Liked
Loved
Community Favorite
Top Answer: 1
Joined: Jun 2010
Posts: 9,332
Likes: 3,873
From: Upstate New York
Default
I've always used the H-D 5R6A (Champion RN12YC) myself. Is there some reason you want to use something else?
 
Reply
0
Old Jun 29, 2014 | 12:19 PM
Share
  #3  
Delawaredave's Avatar
Delawaredave
Thread Starter
|
Novice
Joined: Oct 2009
Posts: 24
Likes: 0
Default
First had no spark - bad coil - replaced.

Now bike is running rough - bogs down on acceleration and sometimes seems to backfire back through carb. Thought next step should be plugs and wires - didn't know if S&S carb would affected recommended plug.

Any brand of wires recommended and website to buy ?

I'm on a budget (read:cheap)......

Thanks !
 
Reply
0
Old Jun 29, 2014 | 12:38 PM
Share
  #4  
Hackd's Avatar
Hackd
Elite HDF Member
Joined: Oct 2005
Posts: 3,872
Likes: 83
From: Canton, Michigan
Default
This the same bike that's been sitting a year????

I'd be checking the intake manifold seals before I started messing around with the spark plugs.
 
Reply
0
Old Jun 29, 2014 | 01:04 PM
Share
  #5  
johnjzjz's Avatar
johnjzjz
Seasoned HDF Member
15 Year Member
Top Answer: 3
Joined: Nov 2006
Posts: 12,878
Likes: 5,449
From: la la land jerzey
Default
in my shop we only use ( iridium sparkplugs ) they last 100,000 miles and perform at a much better rate than the fishing pole weight a champion plug is
 
Reply
0
Old Jun 29, 2014 | 02:33 PM
Share
  #6  
Delawaredave's Avatar
Delawaredave
Thread Starter
|
Novice
Joined: Oct 2009
Posts: 24
Likes: 0
Default
Same bike that has been sitting - I'll check intake seals first - thanks.
 
Reply
0
Old Jun 29, 2014 | 04:22 PM
Share
  #7  
Spanners39's Avatar
Spanners39
Seasoned HDF Member
15 Year Member
Photogenic
Liked
Loved
Joined: Dec 2010
Posts: 7,736
Likes: 1,524
From: Coromandel Peninsula New Zealand
Default
Originally Posted by johnjzjz
in my shop we only use ( iridium sparkplugs ) they last 100,000 miles and perform at a much better rate than the fishing pole weight a champion plug is

Same here......
 
Reply
0

Trending Topics

Old Jun 30, 2014 | 11:53 PM
Share
  #8  
Bumpandrun's Avatar
Bumpandrun
Stellar HDF Member
Joined: Jan 2013
Posts: 2,747
Likes: 419
From: Vermont
Default
Originally Posted by johnjzjz
in my shop we only use ( iridium sparkplugs ) they last 100,000 miles and perform at a much better rate than the fishing pole weight a champion plug is
Well this showed up with perfect timing. Lol. Now that I have the ole pig jetted pretty well. What part number and brand plug do u rocommend.john
 
Reply
0
HD Forum Stories

The Best of Harley-Davidson for Lifelong Riders

story-0

7 Times Harley-Davidson Chucked Tradition Out the Window

 Verdad Gallardo
story-1

7 Surprising Harley-Davidson Products that Are Not Motorcycles

 Verdad Gallardo
story-2

8 Best Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-3

10 Worst Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-4

Killer Custom's Jail Break Is The Breakout That Refused to Blend In

 Verdad Gallardo
story-5

Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

 Verdad Gallardo
story-6

Harley-Davidson Reveals Super Cool Cafe Racer Concept

 Verdad Gallardo
story-7

Engraved Rebellion: Inside Bundnerbike's Glam Rock II

 Verdad Gallardo
story-8

10 Motorcycles You Should Never Buy

 Joe Kucinski
story-9

10 Things Harley-Davidson Needs to Fix in 2026

 Verdad Gallardo
Old Jul 1, 2014 | 12:03 AM
Share
  #9  
Spanners39's Avatar
Spanners39
Seasoned HDF Member
15 Year Member
Photogenic
Liked
Loved
Joined: Dec 2010
Posts: 7,736
Likes: 1,524
From: Coromandel Peninsula New Zealand
Default
Here is a good link when needing plug advice http://www.ngksparkplugs.com/part_fi...es/default.asp
 
Reply
0
Old Jul 1, 2014 | 12:10 AM
Share
  #10  
D_gyver's Avatar
D_gyver
Road Master
Joined: Feb 2014
Posts: 913
Likes: 5
From: indiana
Default
hands down NGK no one makes a better spark plug.
BPR5EIX-11 is the plug I use in my evo.
 
Reply
0



Advanced Search
Reply Closed Thread Share
Forum Jump

All times are GMT -5. The time now is 09:19 AM.

story-0
7 Times Harley-Davidson Chucked Tradition Out the Window

Slideshow: Harley-Davidson built its reputation on nostalgia, but every so often, the company took a hard left turn into the future.

By Verdad Gallardo | 2026-05-20 11:18:19


VIEW MORE
story-1
7 Surprising Harley-Davidson Products that Are Not Motorcycles

Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.

By Verdad Gallardo | 2026-04-29 16:50:35


VIEW MORE
story-2
8 Best Harley-Davidson Motorcycles Ever

Slideshow: Not every Harley gets it right, but these are the ones that genuinely earned their reputation.

By Pouria Savadkouei | 2026-04-15 14:23:21


VIEW MORE
story-3
10 Worst Harley-Davidson Motorcycles Ever

Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.

By Pouria Savadkouei | 2026-04-01 20:01:09


VIEW MORE
story-4
Killer Custom's Jail Break Is The Breakout That Refused to Blend In

Slideshow: Killer Custom's "Jail Breaker" build focuses more on stance and visual aggression than mechanical overhaul.

By Verdad Gallardo | 2026-03-18 19:20:32


VIEW MORE
story-5
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.

By Verdad Gallardo | 2026-03-07 16:15:30


VIEW MORE
story-6
Harley-Davidson Reveals Super Cool Cafe Racer Concept

Slideshow: Harley-Davidson's new RMCR concept revives the café racer formula with modern hardware-and it may be exactly the reset the company needs.

By Verdad Gallardo | 2026-03-04 12:23:37


VIEW MORE
story-7
Engraved Rebellion: Inside Bundnerbike's Glam Rock II

Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.

By Verdad Gallardo | 2026-02-24 18:19:44


VIEW MORE
story-8
10 Motorcycles You Should Never Buy

Slideshow: There is no shortage of great motorcycles to buy, but we would avoid these ten.

By Joe Kucinski | 2026-02-19 14:50:51


VIEW MORE
story-9
10 Things Harley-Davidson Needs to Fix in 2026

Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.

By Verdad Gallardo | 2026-01-13 18:33:17


VIEW MORE