Exhaust System Topics New and old exhaust system discussions. Fitment issues to sound bites and suggestions. Post them here.

Spark Plugs

Thread Tools
 
Search this Thread
 
Old Sep 14, 2009 | 01:11 PM
  #1  
loc's Avatar
loc
Thread Starter
|
Cruiser
Joined: May 2008
Posts: 103
Likes: 0
From: Pittsburgh, PA
Default Spark Plugs

Are the stock plugs ok for 103/255 kit or will the screamin eagle high compressions work "better"?

Big book kit says 10:1 but I believe it is more like 9.7 or 9.8:1
 
Reply
Old Sep 14, 2009 | 01:18 PM
  #2  
wurk_truk's Avatar
wurk_truk
Outstanding HDF Member
Joined: May 2008
Posts: 2,543
Likes: 19
From: Ashland Ohio
Default

Stock plug is what you need, these will work fine. I feel anything else is a marketing thing for $$$.
 
Reply
Old Sep 14, 2009 | 06:03 PM
  #3  
WildBill2566's Avatar
WildBill2566
Road Master
Joined: Aug 2005
Posts: 1,090
Likes: 2
From: Manningtree, England
Default

Stock plugs work fine, a spark is all that is needed.
 
Reply
Old Sep 14, 2009 | 06:13 PM
  #4  
ryanl's Avatar
ryanl
Tourer
Joined: Jul 2009
Posts: 384
Likes: 2
From: Eastern NC
Default

I like the NGK's personally.
 
Reply
Old Sep 18, 2009 | 08:39 PM
  #5  
flibuoy's Avatar
flibuoy
Extreme HDF Member
Joined: Nov 2006
Posts: 13,702
Likes: 38
From: Houston area
Default

+1 on stock...MAYBE gapped down a bit...you can only light the mixture once so big $ plugs are not an issue
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
cpita
Touring Models
19
Aug 3, 2014 06:42 AM
tonetls
Touring Models
15
Jun 1, 2014 06:41 AM
Powertrip240
General Topics/Tech Tips
2
May 5, 2014 05:20 AM
mjaw
Dyna Glide Models
6
Nov 13, 2008 12:50 PM
Nevar
Exhaust System Topics
13
Mar 16, 2005 05:44 PM




All times are GMT -5. The time now is 11:40 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