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Author Topic: fouled plug  (Read 5232 times)

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Offline CRLover

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fouled plug
« on: March 13, 2011, 03:46:27 PM »
Well my first ride of the season didnt go quite as planned.  I fouled a plug right off the bat.  Luckily they had an accessories shop at the track office, where I bought another plug. The bike fired right up and ran great for an hour or so, an then after a little water break, I fired it up and I rode about 100 feet and that new plug fouled. So I tried to clean it  but no go. So I gave up for the day.    Does anyone know why the plug would foul like that ?  I never had a problem B4.   Last fall the bike ran great.  I think Im gonna do a little jettingchanges to see wat happens. Any help would be appreciated.
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Offline CRLover

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Re: fouled plug
« Reply #1 on: March 13, 2011, 03:51:59 PM »
Forgot to say  I ride a 2002 cr 125    I opened up the air box with 4-  1" air vents, and a new 2006 air boot.           But I didnt think I would need to rejet for those small changes. 
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Offline TMKIWI

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Re: fouled plug
« Reply #2 on: March 13, 2011, 04:41:46 PM »
Pull the carb and check for stuck float or choke.
Seems strange if it has the standard jetting.
But it must be getting too much fuel if the plug is fouled.
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Offline SachsGS

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Re: fouled plug
« Reply #3 on: March 13, 2011, 05:28:52 PM »
"The first ride of the season" part of your query caused me concern.Do you live in an area where your bike is exposed to very cold weather?If so it might be worth it to have your ignition checked out,I've seen many a cracked stator as a result of freezing.
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Offline Coop

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Re: fouled plug
« Reply #4 on: March 14, 2011, 04:03:29 AM »
Were you using fresh gas or old stuff leftover?
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Offline MyckMcClung

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Re: fouled plug
« Reply #5 on: March 14, 2011, 05:04:21 AM »
I have had fouled plugs due to, filter rim grease, bad gas, bad crank seals.
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If a pair of 2" brass balls isn't working, I doubt that the 3" model will make much difference.

Offline CRLover

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Re: fouled plug
« Reply #6 on: March 14, 2011, 04:16:42 PM »
Thanks 4 all the advice  I will definately check all that stuff.  It was fresh gas  93 octane with yamalube  32:1        I usually run 40:1  but with a new top end I wanted to add a little extra oil for the first ride.  That might be why Im fouling plugs?!?!?   I should have it fixed  by the weekend
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Offline chump6784

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Re: fouled plug
« Reply #7 on: March 15, 2011, 03:03:35 AM »
32:1 is fairly rich. its funny the manufacturers recommend that but i dont know of who person that actually runs it or at least runs it for long. the richest i have ever run a bike is 36:1, normal is 40:1 in an RM125 and RM250
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Offline ford832

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Re: fouled plug
« Reply #8 on: March 15, 2011, 04:20:11 AM »
If the temp is much warmer now where you are than it was in the fall,it could well just be too rich.If not,other than cleaning the carb,I'd leave the jetting alone and follow some of the above advice.You don't want to generate another problem on top of what you already have.
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Offline Coop

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Re: fouled plug
« Reply #9 on: March 15, 2011, 05:14:10 AM »
Quote from: chump6784 on March 15, 2011, 03:03:35 AM
32:1 is fairly rich. its funny the manufacturers recommend that but i dont know of who person that actually runs it or at least runs it for long. the richest i have ever run a bike is 36:1, normal is 40:1 in an RM125 and RM250

I run 32:1 in ALL my two strokes.

I agree with ford. (Yikes I really just said that...:) )
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Offline MyckMcClung

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Re: fouled plug
« Reply #10 on: March 15, 2011, 05:57:59 AM »
Back when I was running Klotz I would run at 40 or 50:1, but now that I'm running the Lucas I and have all these small bores, I'm running 32:1 no jetting required.
 Was the plug  black and sticky?
or just wet?
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If a pair of 2" brass balls isn't working, I doubt that the 3" model will make much difference.

Offline MyckMcClung

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Re: fouled plug
« Reply #11 on: March 15, 2011, 05:58:56 AM »
Also what heat range plug is it that fouled 8,9 10???
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If a pair of 2" brass balls isn't working, I doubt that the 3" model will make much difference.

Offline CRLover

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Re: fouled plug
« Reply #12 on: March 15, 2011, 07:10:38 PM »
plug was black and wet, dont know how sticky it was.   Running a NGK br9eg resistor
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Offline ACMX

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Re: fouled plug
« Reply #13 on: March 16, 2011, 11:23:37 PM »
I'm a budget racer. I run 32:1 to maximize the life of the bike, sacrificing a small bit of power is fine.
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Offline TotalNZ

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Re: fouled plug
« Reply #14 on: March 16, 2011, 11:48:37 PM »
Quote from: chump6784 on March 15, 2011, 03:03:35 AM
32:1 is fairly rich. its funny the manufacturers recommend that but i dont know of who person that actually runs it or at least runs it for long. the richest i have ever run a bike is 36:1, normal is 40:1 in an RM125 and RM250
I run 30:1 with no problems. Plug fouling's not an oil ratio issue.
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