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Running rich causing fouled plugs. what to do?

Running rich causing fouled plugs. How do you stop from running rich? 2006 hammer.

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  • Anonymous Mar 13, 2014

    keeps fouling rear plug about every 15 miles

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  • 376 Answers

What has been done to the bike resently? If you havent changed anything with the air intake or the exhaust then you my have carb problems.

Posted on Sep 29, 2009

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94 yz 250 fouling plugs bad


Could be fuel or oil fouling. Need to determine which first off. If it is black sooty fouling it is likely too rich also it too rich may be wet.

If oil fouling it is more likely to be much more material fouling and wet sticky material.

A wet, black and shiny deposit on plug base, electrodes and ceramic insulator tip indicates an oil fouled plug. The condition may be caused by one or more of the following: worn pistons, worn piston rings, worn valves, worn valve guides, worn valve seals, a weak battery or a faulty ignition system.

A dry, fluffy or sooty black deposit indicates an air/fuel mixture that is too rich, engine idling for excessive periods of time and/or enrichener usage for excessive periods of time.

A light brown, glassy deposit indicates an overheated plug. This condition may be accompanied by cracks in the insulator or by erosion of the electrodes and is caused by an air-fuel mixture that is too lean, a hot-running engine, valves not seating or improper ignition timing. The glassy deposit on the spark plug is a conductor when hot and may cause high-speed misfiring. A plug with eroded electrodes, heavy deposits or a cracked insulator must be replaced.

A plug with a white, yellow, tan or rusty brown powdery deposit indicates balanced combustion. Clean off spark plug deposits at regular intervals.

Sep 06, 2014 | Motorcycles

1 Answer

P0303 causes?


You don't WANT it turn run leaner. The computer constantly monitors and readjusts the mixture, and it runs LEANER at warm idle than any other time.

Check the distributor cap & rotor. Is #3 spark plug gapped correctly? Pull the plug & inspect it for fouling. Try swapping one of the old plugs back in.

How are you sure than the #3 injector is good?

Jul 29, 2014 | 2006 Dodge Stratus Sedan

1 Answer

Spark plugs foul immediately


Fouled plugs may be caused by oil leaking into the cylinder. Does it smoke when running (cold), are you using up the crank oil. Black smoke is excess gas comsumption, blue smoke is oil burning. If your plug is fouled with black carbon, you are most likely running to rich.

Apr 07, 2014 | Briggs & Stratton Briggs Stratton Vanguard...

1 Answer

Carbon fouling spark plugs


Weak Spark, worn piston rings(Burning oil/compression issues), lack of compression, wrong spark plugs, incorrect spark plug gap, engine not reaching operating temperature (Due to short use), carb. is running rich (May need adjusting), dirty air filter (Causing carb. to choke and run rich). Bad gas
All these symptoms could lead up to fouling plugs.
Hope This Helps.

Sep 27, 2013 | Garden

1 Answer

Carban fouling


carbon on the plugs is a sign of running too rich (Choke on blocked air filter)). When mixed with oil it can be the sump fumes are excessive indication worn rings. If a 2 stroke it is a wrong fuel/oil mixture. Reduce by running hotter plugs (See plug chart at you spares shop for hotter number plugs)

Jun 22, 2013 | Cars & Trucks

1 Answer

John deere 135s won't start briggs and stratton 22 hp engine it is getting spark and fuel and I just put new plugs in because the looked fouled.


Hello,

There are four reasons for fouled spark plugs, 1, You have a resticted air flow ( dirty air filter, or partially engaged choke), so the mixture is rich all the time fouling tghe plugs. 2, You have a poor quality fuel ( old, stale ), and it wont combust/burn hot enough, then fouling the plugs. 3, You might have a piston ring failure causing engine oil to be left on the cylinder wall instead of being wiped back down, and then burning as part of the combustion process. Thus burning and causingg a rich condition again, and fouling the plugs. Then finally number 4, low engine compression. This is again caused by worn cylinder walls and worn piston rings, causing compressed air/fuel mixture to leak past the rings into the crankcase, and when the fuel/air mixture is compressed then ignited, some of the air needed to ignite the fuel has escaped, and thus a rich condition again, fouling the plugs.


Determining which of the Four are causing you fouling is your next step.

Hope this helps

Nov 12, 2010 | John Deere 420,1020,2010,2020,2510,2520...

1 Answer

Were is the fuel fiter


the factory does have a sort of filter that they install on the fuel petcock( on/off fuel switch mounted under tank) but it is a screen( usually plastic) you have to take the 2 screws off and remove the on/off switch to get to it( drain fuel first)......but they hardly ever get clogged!!!! you can check,but i dont think thats your problem...sounds to me like your either running to rich or to lean which will be a carb issue.... do you foul plugs allot?or get a black oily residue leaking from exhaust?( to rich or to much fuel to engine from carb ) if not then sounds like its running to lean.( not enough fuel) ( rich or lean will cause it to bog when hammering on throtle..) if your running lean i would remove carb and clean with carb cleaner( might have a partially pluged jet in the carb.......

Sep 18, 2010 | 2003 Yamaha YZ 125

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

1 Answer

Fuel /emmision


If it ran extremely rich for months and now it won't start, the spark plugs are fouled out. Replacing them will fix your problem -- temporarily.

You'll probably want to check the O2 sensor(s) and replace them as they are probably the cause of the car running extremely rich.

May 15, 2008 | 1999 Chevrolet Venture

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