Question about Pit Bike 125cc 4 Stroke Dirt Bike

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Why dose my pit bike keep fouling sarkplugs

Well i recently bought a brand new 2014 welsh pit bike 125 and it keeps fouling the plugs. I tried the carb and jetting and put new carb on it but it still dose the same.

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RAYMONDO1953

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Is the bike a2 stroke or a four stroke? regards Ray.

Posted on Sep 18, 2014

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sludgehead

Matthew Kiefer

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SOURCE: Bought a brand new welsh pit bike 125 ran the bike in slowly and never over reved it and bike has had regular oil change bike is only 2 mounth old but its starting to blow blue smoke form exsauhst

Rings or oil in the gas.

Posted on Jul 19, 2014

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Plugs-keep-fouling-tried-3-different-plugs-what-can-i-do-to-solve-this-problem


What is causing the fouling? Engine oil? On a two cycle dirt bike, the fouling can be caused by excessive oil in fuel mix. I believe 50 to 1 is the correct ratio yet you may want to cut back, a little at a time, on the oil or run hotter fuel. The exhaust system will also accumulate enough oil sludge to impede the exhaust flow causing poor performance and plug fouling. A two cycle must breath freely to keep itself internally clean. Air cleaner to exhaust. Proper fuel mix should have little , very little. Good Luckand hopefully this helps you.

Dec 27, 2010 | 2003 Yamaha YZ 125

2 Answers

Bike keeps fowling plugs could it be the


usually 2 strokes foul plugs when the oil is two strong in my old bike i mixed the gas 40:1 try that and if it dosent work i would take it to your nearest dealer and get them to check it out

Feb 08, 2010 | 2003 kawasaki KX 125

2 Answers

Hi mt pit bike is spluttering under acceleration i have tryed to adjust air screw with slight difference but it is still not smooth under power. bike is fk1 125 dont know if valve clearence would be the...


Your bike may be jetted too lean. A common problem in these days of overzealous EPA regulations. You can tell if when you've cranked your throttle wide open and it splutters, if you back off on the throttle about 1/8 to 1/4 turn, it clears up. This is indicating that it is jetted too lean. When you close the throttle slightly, the fuel is being metered by the main jet and by backing off on the throttle a bit, you're cutting back on the air, thereby bringing the mixture closer to what the engine needs. Try rejetting the carb, Go up one or two sizes on the main jet, one step at the time.

Now, it could be too rich as well. If it splutters and blows black smoke out the exhaust, it either jetted too rich or the float level in the carb is set wrong.

Take care of the simple stuff first before rejetting the carb. Make sure your spark plugs are the correct ones and they are not fouled from overusage of the choke or enricher. If you allow the bike to "warm up" with the enricher on, plug fouling is common with this practice. I get the bike started and as soon as it will run without the enricher or choke on, I turn it off and keep the bike running with the throttle. Don't foul as many plugs that way.

Nov 09, 2009 | 2008 Yamaha Yamaha G5

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