cr 125 fouling plugs

[whenfoxforks-ruled]

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

 

[jodyboy]

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

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:

 

[Tcarn9]

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

 

[CRazy250]

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

 

[Tcarn9]

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]

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

 

[hot125mod]

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]

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

 

[Tcarn9]

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

 

[bmcd308]

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.

 

[Tcarn9]

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?

 

[crkid33]

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.

 

[Tcarn9]

even with stock jetting you have to mess with it

 

[whenfoxforks-ruled]

even with stock jetting you have to mess with it

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.

 

[jodyboy]

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?

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:

 

[Tcarn9]

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

 

[jodyboy]

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]

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:

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.

 

[Tcarn9]

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

 

[jodyboy]

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?

 

[jodyboy]

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.

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

 

[whenfoxforks-ruled]

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

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

 

[Tcarn9]

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?

 

[schmanman]

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]

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