User Tag List
Results 1 to 13 of 13
Thread: Help reading plugs
-
09-23-2020, 07:26 PM #1Junior Member
- Join Date
- Jul 2020
- Location
- Ft Pierce, FL
- Posts
- 12
- Thanks (Given)
- 2
- Thanks (Received)
- 0
- Likes (Given)
- 1
- Likes (Received)
- 0
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
-
09-23-2020, 07:27 PM #2Junior Member
- Join Date
- Jul 2020
- Location
- Ft Pierce, FL
- Posts
- 12
- Thanks (Given)
- 2
- Thanks (Received)
- 0
- Likes (Given)
- 1
- Likes (Received)
- 0
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
-
09-23-2020, 08:50 PM #3
Rusty
-
pkstv liked this post
-
09-24-2020, 01:38 AM #4Member
- Join Date
- Jun 2012
- Location
- Canada
- Posts
- 84
- Thanks (Given)
- 2
- Thanks (Received)
- 0
- Likes (Given)
- 0
- Likes (Received)
- 5
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
http://www.nightrider.com/biketech/readplugs.htm
Teach a man to fish?
Reality: I'm no expert, so my comments aren't worth much.
-
keefallan liked this post
-
09-24-2020, 05:50 AM #5
Last edited by Merc 2.5; 09-24-2020 at 05:57 AM.
-
Capt Fin thanked for this post
-
09-24-2020, 09:24 AM #6Junior Member
- Join Date
- Jul 2020
- Location
- Ft Pierce, FL
- Posts
- 12
- Thanks (Given)
- 2
- Thanks (Received)
- 0
- Likes (Given)
- 1
- Likes (Received)
- 0
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
-
09-27-2020, 11:29 PM #7
If you want an accurate representation of whats going on inside . It's best to warm the motor up on old plugs . Put the new ones in , run the motor up to wide open with the boat tied to the trailer and a test wheel on the motor . Let it run 10 seconds wide open and turn the key off .. pull the plugs and put them in a piece of cardboard (in order)
If you have a lighted magnifying lens .. as 2.5 sez .. the ring at the bottom is fuel load, the center electrode and the strap will show the plugs heat and OAL temp . Timing will effect how much heat gets into the strap. Don't let the mark make its way around the bend .. flirtin with disaster ..
-
09-28-2020, 06:36 AM #8Junior Member
- Join Date
- Jul 2020
- Location
- Ft Pierce, FL
- Posts
- 12
- Thanks (Given)
- 2
- Thanks (Received)
- 0
- Likes (Given)
- 1
- Likes (Received)
- 0
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
I was going to bring the new set of plugs with me out on the water, warm the motor up, install new plugs, do some WOT runs and kill the motor. Then I was going to bring the boat back in on the old plugs. I've done some reading since our last posts and your info seems spot on. I really appreciate it.
-
10-04-2020, 04:09 PM #9Junior Member
- Join Date
- Jul 2020
- Location
- Ft Pierce, FL
- Posts
- 12
- Thanks (Given)
- 2
- Thanks (Received)
- 0
- Likes (Given)
- 1
- Likes (Received)
- 0
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
-
10-04-2020, 04:10 PM #10Junior Member
- Join Date
- Jul 2020
- Location
- Ft Pierce, FL
- Posts
- 12
- Thanks (Given)
- 2
- Thanks (Received)
- 0
- Likes (Given)
- 1
- Likes (Received)
- 0
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
-
10-05-2020, 09:31 AM #11
Here’s a screenshot of a graphic plug reading chart I saved a while back from the Yellowbullet forums:
Bear in mind this is for a four-stroke, but I think the same principles apply as to heat range and jetting. A rich 2-stroke plug may be wet with oil as well, since unlike a 4-stroke the oil is in the fuel.
BTW: You need to be using a magnifying glass with good light to properly read plugs and it’s hard and sometimes misleading to read plugs from a photo someone takes, unless it’s magnified and has really good definition.Last edited by CI STV; 10-05-2020 at 09:35 AM.
-
10-05-2020, 09:31 AM #12Junior Member
- Join Date
- Jul 2020
- Location
- Ft Pierce, FL
- Posts
- 12
- Thanks (Given)
- 2
- Thanks (Received)
- 0
- Likes (Given)
- 1
- Likes (Received)
- 0
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
I just cut more threads back from the first two plugs and revealed the true carbon ring. All three look like this...
With my 14p prop it falls on its face at 3800 rpm and I have to back it way off till it clears out then I can slowly run it up to rpm. With a 10p prop it doesn't fall on its face until WOT. Any ideas? Can I go one main jet size smaller from a 145 to a 140?
-
10-05-2020, 10:11 AM #13
When you cut the plugs on the thread side , you run the risk of wiping the ring off.
You can cut them from the top side and slide the porcelain out of the body.
The three plugs you had in your hand show a grey ring at the base. Once cut , not so much.
The discoloration of the ground strap looks to be just before the bend on the first two starting to go around the bend on the one to the right.
save the body too , look at it from the side , you can see how far the heat traveled.
An oldie .. but goodie ...
https://www.strappe.com/plugs.html
How to cut plugs ...
-
Capt Fin, InjectorService thanked for this postCapt Fin, Glasstream15 liked this post
Similar Threads
-
reading plugs
By texasvector in forum Technical DiscussionReplies: 8Last Post: 12-13-2013, 09:49 AM -
Reading your plugs!?
By MidnightCarving in forum Technical DiscussionReplies: 2Last Post: 04-30-2011, 08:31 PM -
Reading plugs
By supergenius74 in forum Technical DiscussionReplies: 20Last Post: 05-31-2004, 07:21 PM -
need help reading plugs
By Tom in forum Technical DiscussionReplies: 13Last Post: 04-06-2002, 08:24 AM -
Reading Plugs and Pistons
By Craig Knight in forum Technical DiscussionReplies: 4Last Post: 09-04-2001, 11:56 AM