Two Stroke Motocross
Two Stroke Motocross Forum => Technical => Topic started by: CRLover on March 13, 2011, 03:46:27 PM
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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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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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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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"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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Were you using fresh gas or old stuff leftover?
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I have had fouled plugs due to, filter rim grease, bad gas, bad crank seals.
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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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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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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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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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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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Also what heat range plug is it that fouled 8,9 10???
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plug was black and wet, dont know how sticky it was. Running a NGK br9eg resistor
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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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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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I'm a budget racer. I run 32:1 to maximize the life of the bike, sacrificing a small bit of power is fine.
I don't believe you're sacrificing power at all. More oil more power i reckon.
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More oil will not sacrifice power, it will not cause plug fouling, it just makes more spooge to clean up.
"Black And wet" huh?
If that was a new plug your crank seals are weeping buddy
If were sticky it would be from filter rim grease
If it were just wet, ignition problem
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I do'n't get any spooge because my jetting's good.
The oil comes out of suspension in your crankcase and more oil to the bearings is a good thing.