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Why does it keep fouling plugs and doesn't run as fast

Posted by Anonymous on

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6ya6ya
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Posted on Jan 02, 2017

  • 2712 Answers

SOURCE: plug foul

but now I see it isn't. Since then I have installed a new air filter new packing in the muffler new reeds. I cleaned the carborator and check to make sure the needles weren't defective. Also I checked the flow valves and they are free of debris. That's simple enough you either have your gas mixed wrong or there's a bad seal somewhere so check the gaskets that should take care of it.,,,

Posted on Nov 10, 2008

  • 32 Answers

SOURCE: Spark Plug Fouling

fix the root cause . probly needs valve guid seals.

Posted on Mar 10, 2009

  • 14036 Answers

SOURCE: runs rough and keeps fouling out new spark plugs

plugs could be wrong heat range they could be too cold make sure you have right heat range.if all is good.replace air filter.have injectors tested they could be leaking when you turn engine off.have charcoal canister check.check fuel pressure regulator for rupture diaphram.if all is good.scan it check egr valve.if stuck open a little it will cause rough running foul out plugs.

Posted on May 29, 2009

mxtras
  • 194 Answers

SOURCE: 2000 yz125 keeps on fouling out plugs

Fouled plugs are typically caused by jetting that is too rich. This could also be from a dirty air filter which can make the bike run rich. Clean up your filter and see if that is it. If the filter is not too bad, you might want to drop a size on your pilot or main.

Another possibility is poor compression - this can make a 2-stroke run richer than normal as the fuel can not be burned properly. Rings don't last long in these 125s. I used to re-ring each week when I was racing 125s.

You might want to run a B8ES plug, too - this is one step hotter and will help the plug from fouling as often.

Posted on Feb 01, 2010

  • 640 Answers

SOURCE: why do i keep fouling

Sounds like you are burning a lot of oil or you used two cycle fuel instead of regular gasoline. If you used the wrong fuel, drain tank and carburetor and it will clear up pretty quick. If you used the right fuel, did you overfill the oil? If oil level is where it should be, and the right fuel was used, then the alternatives from there fall into the not so good catagory, and they all involve at least some amount of engine disassembly.

Good luck.

Posted on Jul 31, 2011

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If it consistently shuts down when it warms up you are probably losing ignition. It sounds like you have a weak ignition coil. There is two or three different adjustments you can make to the carb. Idol speed, low speed mixture screw(pilot) and high speed mixture screw(main jet) If you can get a good vid of the carb I can direct you

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the next time it fouls check the plug when you take it out, if it is covered with oil then you may have a broken ring on the cylinder that is allowing oil to pass through to the combustion chamber and fouling the plug. Or the valves pay be letting oil drain in past the valve seats.

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Has the fuel filter been replaced lately? Also you can look to see if the new spark plugs are getting fouled out still. Sometimes just replacing the spark plugs wont fix the problem.

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I have a 1994 Chevy C1500 w/ 4.3 liter and my plugs are fouling out about every 500 miles or less and everything else maintanence wise I've replaced resently. Can someone give an idea on what need


Does the truck run right? Does it smell real gassy, fuel mileage go south? If it is fouling plugs that fast it either has to be burning a lot of fuel or oil. Is there a check engine light on? Engine wore out, burning a lot of oil. Fuel injector stuck, using a lot of gas. Air filter dirty, making it burn way rich. I would think this truck would really smell bad if it is fouling out the plugs that fast.

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1 Answer

My 04 harley night train keeps fouling plugs left and right i richened the mixture with a 52 pilot jet. ran fine for awhile then fouled again could this be an electrical problem?


A #52 pilot is a bit on the rich side in my opinion. I usually use either a #48 or a #50 but each machine is a bit different and your location effects it as well. I wouldn't think an electical problem is the cause or you'd notice erratic engine performance prior to the plugs fouling such as misfiring, coughing or spitting back through the carb. How long are you running the enricher when cold starting the engine? This is the biggest reason I see for fouling plugs. People will start the engine with the enricher and allow the engine to run while they put their riding gear on, sometimes five minutes at full enrichement. This will foul the plugs quickly. The enricher uses a different fuel circuit than the normal running operation uses. It draws fuel directly from the float bowl and it's a very rich mixture. Try starting the bike with the enricher and once you can keep the engine running with the throttle, turn the enricher off. Use the throttle tension knob underneath the throttle to hold the throttle open enough to keep the engine running until it warms up.

Good Luck
Steve

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1 Answer

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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

1 Answer

My trimmer will start but will not stay running? Fuel mix is correct, I can adjust the throttle screw to keep it running but it still stalls out after it gets running. what else can I do to repair this...


You may have a fouled carburator. Also, check the spark plug for signs of fouling (Black and oily). The plug should look grey and have a somewhat dry appearance. Try using a carburator cleaner first, and if that doesn;t do it you'll need to overhaul the carburator itself.

Jul 11, 2010 | Troy Bilt Tb70ss Gas Trimmer

2 Answers

2000 yz125 keeps on fouling out plugs


Fouled plugs are typically caused by jetting that is too rich. This could also be from a dirty air filter which can make the bike run rich. Clean up your filter and see if that is it. If the filter is not too bad, you might want to drop a size on your pilot or main.

Another possibility is poor compression - this can make a 2-stroke run richer than normal as the fuel can not be burned properly. Rings don't last long in these 125s. I used to re-ring each week when I was racing 125s.

You might want to run a B8ES plug, too - this is one step hotter and will help the plug from fouling as often.

Feb 01, 2010 | 2004 Yamaha YZ 125

2 Answers

Runs rough and keeps fouling out new spark plugs


sounds like too rich of a mixture check for vacuum leaks and check fuel press regulator

Apr 23, 2009 | 1996 Mazda Millenia

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Spark Plug Fouling


fix the root cause . probly needs valve guid seals.

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