cr 125 fouling plugs

whenfoxforks-ruled

Old MX Racer

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Oct 19, 2006

8,129

2

Merrillville,Indiana

• Jul 10, 2008

• #26

Jetted properly will have it last as long as possible. Lean or rich is not good. Check your plug if you have doubts?

 

J

jodyboy

Member

Mar 5, 2008

32

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• Jul 11, 2008

• #27

Tcarn9 said:

i live in central new york i moved that needle up one more notch and hasnt fouled a plug yet so im hoping that that will do it but in doing this does it affect the life time of the engine does it shorten it in anyway or harm it in any way? just wondering

Click to expand...

NO. That is of course if you do a proper plug reading. The higher you raise the clip the dryer the plug should get. The plug should be a light brown or tan color. Make sure that it DOES NOT have white deposits. White deposits are a sign that you've went a too far leaning it out. You may possibly foul a plug one more time in a few days, maybe even a week or two. Hopefully not, but if so move it up one more notch. That should do the trick. Don't panic if you have to set it all the way to the top. Every bike runs a little different. Just like every gun shoots a little different. It doesn't matter if someone else has the same bike that is jetted different, or needle clip is at a different notch. Keep us updated! :cool:

 

T

Tcarn9

Member

Jun 27, 2008

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• Jul 11, 2008

• Thread starter
• #28

i will thanks for all the help i relly appreciate it it has been a problem now for over 4 years now its finally hopefully being cured i will keep you guys posted

 

C

CRazy250

Member

May 28, 2006

334

1

• Jul 15, 2008

• #29

check for weak spark, not the plug but check the wires from the stator to the coil, and check the coil.

 

T

Tcarn9

Member

Jun 27, 2008

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• Jul 26, 2008

• Thread starter
• #30

bad news. Everything was great for 4 days i didnt foul one spark plug and a road quite a bit. then in fouled on the fifth day when we put a new silencer on it.

 

whenfoxforks-ruled

Old MX Racer

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Oct 19, 2006

8,129

2

Merrillville,Indiana

• Jul 26, 2008

• #31

No, you really wanted to say the jetting changed because of an outside factor. Weather or I do not know, maybe the silencer??

 

H

hot125mod

Member

Jan 14, 2007

501

0

• Jul 27, 2008

• #32

Hey, i have a simple question, what brand of premix oil are you using and at what ratio? I have been having a plug fouling problem also with my kx. I used maxima 927 at 32:1 and it was perfect plug color, the jetting was great, then the 927 became scarce so i started to use amsoil dominator at the same ratio and fouled plugs left and right. On the bottle it says 50:1, that seems to be really lean to me, is it because it is a full synthetic?

 

whenfoxforks-ruled

Old MX Racer

~SPONSOR~

Oct 19, 2006

8,129

2

Merrillville,Indiana

• Jul 27, 2008

• #33

About 32 dollars to have 1 half gallon of 927 shipped to your door, http://www.bobscycle.com/cart.htm?message=addedtocart.

 

T

Tcarn9

Member

Jun 27, 2008

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0

• Jul 27, 2008

• Thread starter
• #34

i use klots oil we mix it 4 ounces of oil for every gallon

 

B

bmcd308

Member

Feb 9, 2007

58

0

• Jul 27, 2008

• #35

Using less oil (going from 32 to 1 to 50 to 1) actually richened your mixture rather than leaning it.

When you use less oil, you have more gas per unit volume of fuel mix, so you have more fuel per unit of air through the intake.

 

T

Tcarn9

Member

Jun 27, 2008

24

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• Jul 29, 2008

• Thread starter
• #36

i moved the needle up two notches and it didnt foul a plug for four days then alll of the sudden it fouled then we put the new silencer on what should i do to stop the fouling move the neddle down one nothc?

 

C

crkid33

Member

Jun 20, 2007

83

0

• Jul 29, 2008

• #37

usually if you put on a new silencer, or header you have to jet it right. so, start playing with the jetting again till you get it right.

 

T

Tcarn9

Member

Jun 27, 2008

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• Jul 31, 2008

• Thread starter
• #38

even with stock jetting you have to mess with it

 

whenfoxforks-ruled

Old MX Racer

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Oct 19, 2006

8,129

2

Merrillville,Indiana

• Jul 31, 2008

• #39

Tcarn9 said:

even with stock jetting you have to mess with it

Click to expand...

Especially stock jetting. Even once you get it right. 15 to 20 degree change in the weather, or atmospheric pressure can effect jetting, along with altitude.

 

J

jodyboy

Member

Mar 5, 2008

32

0

• Aug 4, 2008

• #40

Tcarn9 said:

i moved the needle up two notches and it didnt foul a plug for four days then alll of the sudden it fouled then we put the new silencer on what should i do to stop the fouling move the neddle down one nothc?

Click to expand...

Yeah, with a new pipe they tend to run lean. What's the plug telling you? Do a plug reading. Did it foul before the pipe was put on? Put the stock pipe back on. Get the bike to stop fouling before you put a new pipe on. If you do both at one time, you're just running around in circles. :bang: How far are you from the top notch? As I said earlier, it may take your bike about a week to foul the plug before the clip is set in the right notch. Probably one more notch and you're there. Then you can put the pipe on and adjust you jetting from plug readings. :cool:

 

T

Tcarn9

Member

Jun 27, 2008

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• Aug 5, 2008

• Thread starter
• #41

yeah the plug did foul before we put the pipe on it lasted 4 days without fouling then all the sudden it did we moved the needle down a notch to see how that works out i will keep you guys posted on that

 

J

jodyboy

Member

Mar 5, 2008

32

0

• Aug 5, 2008

• #42

You're going the wrong way if it's wet fouling. If you're all the way to the top, put the clip back in the original position and go down on the main jet. :cool:

 

whenfoxforks-ruled

Old MX Racer

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Oct 19, 2006

8,129

2

Merrillville,Indiana

• Aug 5, 2008

• #43

jodyboy said:

You're going the wrong way if it's wet fouling. If you're all the way to the top, put the clip back in the original position and go down on the main jet. :cool:

Click to expand...

Close, but no, he will need a leaner needle. Where is the air screw adjusted to? And he did say he lowered the needle. Lower the needle or raise the clip, it should get leaner. Set the air screw to tell you how the pilot jet size is. Then set the needle clip, then the main. If it does not make sense, replace the float valve.

 

T

Tcarn9

Member

Jun 27, 2008

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• Aug 10, 2008

• Thread starter
• #44

a moved the needle down a notch and it still fouled the plug. any suggestions??

 

J

jodyboy

Member

Mar 5, 2008

32

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• Aug 10, 2008

• #45

You moved it down or up? Have you moved it all the way to the top? If so, whenfoxforks-ruled says you need to go to a leaner needle. I have no experience in going to a leaner needle, but I would imagine that the clip should be put in the stock position and then moved accordingly. You still haven't told us what the plug looks like when you pull it. Is it black and wet?

 

J

jodyboy

Member

Mar 5, 2008

32

0

• Aug 10, 2008

• #46

whenfoxforks-ruled said:

Close, but no, he will need a leaner needle. Where is the air screw adjusted to? And he did say he lowered the needle. Lower the needle or raise the clip, it should get leaner. Set the air screw to tell you how the pilot jet size is. Then set the needle clip, then the main. If it does not make sense, replace the float valve.

Click to expand...

I guess I was getting a little bit ahead of myself.

 

whenfoxforks-ruled

Old MX Racer

~SPONSOR~

Oct 19, 2006

8,129

2

Merrillville,Indiana

• Aug 11, 2008

• #47

Tcarn9 said:

a moved the needle down a notch and it still fouled the plug. any suggestions??

Click to expand...

What notch is it in? You ARE following the steps? The pilot is good? The plug is wet in each of the lower circuits?

 

T

Tcarn9

Member

Jun 27, 2008

24

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• Aug 19, 2008

• Thread starter
• #48

i took off the new silencer and put the old one back on and hasnt fouled yet so now what should i do about the new one?

 

S

schmanman

Mi. Trail Riders

Member

Jan 9, 2007

437

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• Aug 19, 2008

• #49

maby lower than that!

I run my it 175 at 20:1, that's what it was run at from the factory, and it still does not foul plugs.

I like running my bike with a high Gas:Oil ratio, better engine lubrication and longer life.

 

whenfoxforks-ruled

Old MX Racer

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Oct 19, 2006

8,129

2

Merrillville,Indiana

• Aug 19, 2008

• #50

Where is your jetting at now? What is the difference in the 2 silencers, besides being new?