User Tag List
Thanks: 0
Likes: 0
Results 1 to 7 of 7
Thread: Read my plugs
-
11-21-2021, 09:41 PM #15000 RPM
- Join Date
- Dec 2018
- Location
- Maine
- Posts
- 137
- Thanks (Given)
- 0
- Thanks (Received)
- 3
- Likes (Given)
- 0
- Likes (Received)
- 22
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
Read my plugs
As the title says, please read my plugs and tell me what you can. I am trying to figure out if my jetting is good, lean, or rich. And if the heat range of the plug is good. I run 40:1 premix oil. These plugs have been run for two seasons. I experienced a miss at WOT this year. All electronics are new (boxes, stator, etc), I think it's fuel or carb related. Also I'm trying to get the last few mph out of this 94 150hp 2.0 Mariner. The main jets are currently .62 in wmh31 carbs.
-
11-22-2021, 10:49 AM #2
It is very hard to read surface gap plugs, put in a set of std gap plugs or read the piston dome. Also you need to run wot for 1-2 min and shut the key off to get proper reading.
Last edited by perfmarine1; 11-22-2021 at 10:52 AM.
-
11-22-2021, 11:34 AM #3
there are some good threads on here regarding reading plugs.. the Most accurate methods will require cutting the threads away to see the porcelain base
-
11-22-2021, 11:50 AM #4
Plug reading you need to run at WOT for a while and cut ign at WOT to do a read. As was said surface gap plugs are tough to read. Checking piston wash should also be done at same time. Not sure why you are running 40:1 mix unless you are turning over 7000rpm. for the cost try a new set of plugs.
Dave1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
-
11-22-2021, 11:55 AM #5Screaming And Flying!
- Join Date
- Feb 2015
- Location
- Ontario
- Posts
- 8,091
- Thanks (Given)
- 205
- Thanks (Received)
- 321
- Likes (Given)
- 1921
- Likes (Received)
- 2005
- Mentioned
- 2 Post(s)
- Tagged
- 0 Thread(s)
Put a set of BUHW in it, make sure the conductors (TCW wire) / boots are perfect, try again.
-
11-22-2021, 01:45 PM #65000 RPM
- Join Date
- Dec 2018
- Location
- Maine
- Posts
- 137
- Thanks (Given)
- 0
- Thanks (Received)
- 3
- Likes (Given)
- 0
- Likes (Received)
- 22
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
Maybe switching to 50:1 would give it more power? Less oil and more fuel.
-
11-22-2021, 04:42 PM #76000 RPM
- Join Date
- Feb 2011
- Location
- HUDSON, FLORIDA
- Posts
- 1,528
- Thanks (Given)
- 431
- Thanks (Received)
- 64
- Likes (Given)
- 434
- Likes (Received)
- 452
- Mentioned
- 1 Post(s)
- Tagged
- 0 Thread(s)
PLUGS look pretty good to me, 40/1 oil mix, fine. i wouldnt mess with it. i have the same motor.
Similar Threads
-
Plugs
By Merc 2.5 in forum Technical DiscussionReplies: 17Last Post: 05-16-2018, 10:10 PM -
How do you read plugs like this?
By Kim Heidi in forum Technical DiscussionReplies: 7Last Post: 10-01-2007, 09:30 AM -
Spark Plugs- How to Read
By Fish in forum Technical DiscussionReplies: 3Last Post: 03-23-2005, 04:17 PM -
PLEASE READ GENERAL " Everybody Read" Thanks, Jay
By Jay Smith in forum Technical DiscussionReplies: 0Last Post: 08-11-2002, 10:35 AM