Reading Plugs??

Reply Subscribe

Thread Tools

Search this Thread

Jul 2, 2007 | 01:22 PM

SportyPig

Thread Starter

Ultimate HDF Member

Joined: Jul 2006

Posts: 6,478

Likes: 12

From: Nashville, TN

Reading Plugs??

I changed my Spark plugs a few days ago, and they told me what I already suspected. The bike was running a bit too rich. So, I did just a quick adjustment to get it a bit more lean. Reading plugs is a new thing for me. How many miles would I need to ride before I could pull them and get a good reading on my adjustment?

I searched in the Tech forum area for this, but didn't really find the answer.

Thanks!

Jul 2, 2007 | 02:32 PM

cHarley

Club Member

Joined: Feb 2007

Posts: 16,320

Likes: 306

From: Boynton Beach, FloriDuh

RE: Reading Plugs??

Randy, I sent you an email on this.

Jul 2, 2007 | 03:02 PM

FloridaDrafter

Tourer

Joined: Dec 2006

Posts: 362

Likes: 0

From: Jacksonville, Fl

RE: Reading Plugs??

Quote:

ORIGINAL: cHarley

Randy, I sent you an email on this.

Did you tell him about "Throttle Chopping" to read his plugs? I have never seen it mention on this forum, but that's the way I've always checked my metric. Just curious.

-Andy

Jul 2, 2007 | 03:08 PM

cHarley

Club Member

Joined: Feb 2007

Posts: 16,320

Likes: 306

From: Boynton Beach, FloriDuh

RE: Reading Plugs??

Yep, that's part of the discussion. It's just easier to explain the process "live" than going through all the possible sceneros here with simplistic instructions. Reading plugs today just isn't as easy as it was back in the day of leaded fuel.

Jul 2, 2007 | 05:10 PM

Booey424

Grand HDF Member

Joined: Feb 2007

Posts: 3,945

Likes: 6

From: Letart,WV

RE: Reading Plugs??

Leaded fuel? What's that?

Jul 3, 2007 | 06:44 AM

cHarley

Club Member

Joined: Feb 2007

Posts: 16,320

Likes: 306

From: Boynton Beach, FloriDuh

RE: Reading Plugs??

OK, for those of you that really want a tutorial on reading plugs, read here: https://www.hdforums.com/m_325895/tm.htm

Jul 3, 2007 | 07:54 AM

dan69co

Tourer

Joined: Mar 2007

Posts: 367

Likes: 0

From:

RE: Reading Plugs??

You can also try the sportster homepage for alot of useful info. They have some very good carb info there.

Trending Topics

Cam chest noise

76

2.4k
Shameful story with a happy ending

25

819
NGK Ruthenium plug for TC

29

747
2014 ultra limited fob/ pin issues

15

392
Well, who says you cant teach an old dog new tricks!

47

2.0k

Jul 3, 2007 | 08:09 AM

bigtop1

Road Master

Joined: Nov 2006

Posts: 861

Likes: 0

From: Grosse Ile, Mi

RE: Reading Plugs??

I'm from the school of "if it ain't broke, don't fix it". If you were running rich, then you would have had some symptoms of it. In my opinion, we should all be running a little rich. If the bike starts easy, if it is not spitting, idling poorly, if your mileage is satisfactory,if you have good throttle response in all the ranges then, you were probably OK. The point is, a "little" rich. The mere fact that you changed the plugs should have done all of the above without any other changes. The best way to absolutly know is to put it on a dyno. Be careful in making changes after putting in new plugs. Ride it for awhile first.