Advanced Search

The Green Industry's Resource Center


  #1  
Old 09-25-2015, 06:25 AM
PhillT PhillT is offline
LawnSite Member
 
Join Date: Sep 2015
Location: Australia
Posts: 15
Plug problem

What is shown in the picture has happened to me more than a couple of times over the years, and I have never really got to the bottom of it.

I have been using the Kawasaki line trimmer with the same fuel for a few days, no problem, then it starts doing this.
I wire brush it off, and it might happen in an hour, or it might happen again in 5 minutes.

Sometime the material is in the shape of a ball, other times like a hair, but always on the outer electrode.

I might add that I have had this same thing happen to me years ago with a Johnson outboard motor, and a Stihl chainsaw.
I have tried different 2-stroke oils, seems to make no difference.
A new plug might fix it for a day, or a month, or a year.
It would be nice to get a real answer to this.
Thanks
PhillT.
Attached Images
 
Reply With Quote
  #2  
Old 09-25-2015, 07:07 AM
ToddH's Avatar
ToddH ToddH is online now
LawnSite Silver Member
 
Join Date: Aug 2012
Location: Grand Prairie, Texas
Posts: 2,183
Looks rich. If your mix is fine then carb adjustment is in order
__________________
By Todd Hancock
https://www.hancockglen.com

Google Plus

Google Reviews
Reply With Quote
  #3  
Old 09-25-2015, 01:35 PM
BigFish's Avatar
BigFish BigFish is offline
LawnSite Silver Member
 
Join Date: Jul 2008
Location: chesapeake, va
Posts: 2,622
Quote:
Originally Posted by PhillT View Post
What is shown in the picture has happened to me more than a couple of times over the years, and I have never really got to the bottom of it.

I have been using the Kawasaki line trimmer with the same fuel for a few days, no problem, then it starts doing this.
I wire brush it off, and it might happen in an hour, or it might happen again in 5 minutes.

Sometime the material is in the shape of a ball, other times like a hair, but always on the outer electrode.

I might add that I have had this same thing happen to me years ago with a Johnson outboard motor, and a Stihl chainsaw.
I have tried different 2-stroke oils, seems to make no difference.
A new plug might fix it for a day, or a month, or a year.
It would be nice to get a real answer to this.
Thanks
PhillT.
Looks to be from carbon build up in da cylinder/piston crown.
You should pull the muffler and check/clean the exh. port in the cyl.
You can prolly scrape a good deal of the chit off the piston thru the exh. port if your careful.
Stihl makes a decarbonizing fluid that works also: pour it in a warm cylinder and let sit overnight or so...

You need to start using the unit at WOT, let that sucker scream!
Too long a line will contribute to carbon build up via not lettin' the unit rev up enough.
__________________
It ain't rocket science!
XXXXXXXXXX.....so far.

'Course if yer house has more wheels than yer truck...
" Old age ain't for sissies "
......AMF!
Reply With Quote
  #4  
Old 09-25-2015, 02:01 PM
larryinalabama larryinalabama is offline
LawnSite Fanatic
 
Join Date: Jan 2008
Location: Ragland Al
Posts: 15,139
Might try a new plug, that one looks like something out of ww11
Reply With Quote
  #5  
Old 09-25-2015, 02:15 PM
Wacker Mechanic's Avatar
Wacker Mechanic Wacker Mechanic is offline
LawnSite Member
 
Join Date: Jun 2015
Posts: 226
You need to decarbonize the motor. You can do this by adding Seafoam to the gas mix. If you use a little of it on each fill up, it will prevent the carbon from forming inside the motor in the first place.
Reply With Quote
  #6  
Old 09-26-2015, 02:03 AM
PhillT PhillT is offline
LawnSite Member
 
Join Date: Sep 2015
Location: Australia
Posts: 15
The plug is an NGK, would not have done more than 40 hours, probably less.

I do tend to run it at half throttle most of the time because it is just so powerful there is rarely a need to use more throttle.
I checked those areas, and there is very little sign of carbon build-up.
As advised, (thanks Todd ) I have leaned the running mixture a little, and so far so good,...got about 3 hours out of it today and still good.
Probably should have mentioned that this growth on the plug is hard as hell, like glass. If squeezed in pliers it shatters into powder, exactly like glass, or sand.

Hopefully with the leaner running mix, this is solved, if not I will follow up further.

Now I have a problem with the other end of the machine, so I will post a new thread for that.
Cheers.
Reply With Quote
  #7  
Old 09-26-2015, 12:18 PM
Breezmeister's Avatar
Breezmeister Breezmeister is offline
LawnSite Bronze Member
 
Join Date: Jul 2007
Location: South Jersey
Posts: 1,422
Quote:
Originally Posted by PhillT View Post
The plug is an NGK, would not have done more than 40 hours, probably less.
I had a similar problem a few years back that was from contaminated fuel at the pump. Something is dissolved in the gas and is making it pass the fuel filter, fouling and bridging the plug. After changing suppliers the problem went away. Also, you should run more at wot, this will help burn off and clear out the chit.
__________________
.
Masters Degree in Thinking Out Side Of The Box,Graduate of the MacGyver Institute of Ingenuity

The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic

RTFM What a concept

Reply With Quote
  #8  
Old 09-26-2015, 10:15 PM
PhillT PhillT is offline
LawnSite Member
 
Join Date: Sep 2015
Location: Australia
Posts: 15
The same fuel out of the same jerry can is working fine in my mower (4-stroke) and my chainsaw.
I'll try giving it a hard run every few minutes.
Cheers.
Reply With Quote
  #9  
Old 09-27-2015, 12:17 AM
Breezmeister's Avatar
Breezmeister Breezmeister is offline
LawnSite Bronze Member
 
Join Date: Jul 2007
Location: South Jersey
Posts: 1,422
Quote:
Originally Posted by PhillT View Post
The same fuel out of the same jerry can is working fine in my mower (4-stroke) and my chainsaw.
I'll try giving it a hard run every few minutes.
Cheers.
And that is the funny part, our guys filled up at a local WAWA. ( Wawa is like 7/11, I know you guys have 7/11 down under ) Same gas went into the trucks, the Exmarks. The same 2 cycle went into the blowers. No problems.....When they moved to another Wawa that was closer, the problem went way.

I found out that BP was supplying the fuel for Wawa, and from what I figure, the problem was only at the one Wawa. If you can, just change petrol stations for a few weeks....
__________________
.
Masters Degree in Thinking Out Side Of The Box,Graduate of the MacGyver Institute of Ingenuity

The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic

RTFM What a concept

Reply With Quote
  #10  
Old 09-27-2015, 10:14 AM
ToddH's Avatar
ToddH ToddH is online now
LawnSite Silver Member
 
Join Date: Aug 2012
Location: Grand Prairie, Texas
Posts: 2,183
We did switch all the handhelds to premium 93 octane.
__________________
By Todd Hancock
https://www.hancockglen.com

Google Plus

Google Reviews
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Layout Style:




Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.
Copyright ©1998 - 2012, LawnSite.comô - Grand View Media
All times are GMT -4. The time now is 03:35 PM.

Page generated in 0.07838 seconds with 11 queries