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Reasons why both spark plugs keep fouling - FXR Super Glide Harley Davidson Motorcycles

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  • Harley Davidson Master
  • 3,506 Answers

What year??? EFI or carburetted???

Posted on Oct 14, 2014

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: spark keeps fouling but no clue why

Are you losing gear oil.
When the crankshaft seal leaks, oil from the gearbox is sucked into the crankcase, and this can foul the plug.
Also check the plug gap, most guys set the gap too small. It should be 0,7mmto 0,8mm. The plug should be a B9 EG, or equivilant.
Now, you can also change the plug cap to a type that has a built in resistor, this also helps with plug life.
Note that 2 strokes use plugs way more than 4 strokes, and you should replace the plug every 15-20 hours to keep your riding pleasant.
Good Bike you have there
Cheers
Jon

Posted on Feb 16, 2009

  • 3567 Answers

SOURCE: Spark plug keeps oil fouling.

32 to 1 is the standard mix. That is 4 ounces two stroke ENGINE oil per gallon. The brand doesn't really matter. Don't use MOTOR oil in the gas. The stock plug is NGK brand, R6918B-9. I would suggest a hotter plug, R7376-8. The last digit is the heat range. The lower the number, the hotter the plug.

Posted on Feb 12, 2010

  • 1 Answer

SOURCE: my 02 yamaha yzf 426

I have had the same problem with my bike, but found out that the jets were wrong and had to down size two times and now i have had no problems starting up or if i have stalled the bike it only takes about kicks to get it running again.

Posted on Jul 15, 2010

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SOURCE: 93 gsxr. it keeps fouling spark plugs.

my 1993 gsxr wp is running rich and only doing 25 mpg, ive changed the air filter and dropped the neddle a notch but is still rich. any ideas cheers<!-- from fixya rte -->

Posted on Aug 11, 2010

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SOURCE: We keep fouling spark plugs.

Several ways to try. Be sure the air filter is clean and without any tears or punctures, install an in-line fuel filter, gap the spark plug at .030, be sure the stock spark plug is used ( NGK CR7HSA ), be sure the muffler not plugged up at all, increase the idle speed, and change the gearbox oil every 2 or 3 months. The only other thing would be to de-carbon the piston and head but that requires the head to be removed. Taking the head off isn't hard but you must be sure to have the valve cam timed properly when reassembled. If not installed properly, you can bend a valve the first time you try to kickstart. Please rate my answer.

Posted on Jul 12, 2011

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1 Answer

Spark plugs keep fouling out, why


Monica, reasons for plugs to foul, bad fuel, wrong spark plugs, failing ignition components(wire,coil,points,etc),worn engine internal components(pistons,rings,valves), faulty/incorrect adjustment on carburetor,etc.
Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Technical information

https://www.google.ca/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=spark+plug+fouling+chart

Mar 25, 2016 | Electrical Supplies

1 Answer

Reasons why both spark plugs keep fouling on my 1993 1340 evo harley davidson


make sure you are running the correct plug and wires for your engine and that it is properly gapped. if your piston rings are worn, excess oil burning can foul the plugs. make sure the carb is properly jetted and/or the fuel injection system is properly mapped.

May 09, 2014 | Harley Davidson FXR Super Glide...

1 Answer

MY 1998 YZ 125 KEEPS FOULING PLUG AND THEN BOGS DOWN


Hi, Anonymous and the usual suspects are:
1. Fuel mixture too rich or enrichner left out too long.
2. Incorrect spark plugs for your kind of service.
3. Piston rings badly worn or broken.
4. Valve guides are badly worn and/or seals worn, crushed or have come off valve guide and pump oil through it.
5. Spark plug cable weak or ignition coil faulty.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Why Does My Dirt Bike Keep Fouling Spark Plugs
Fouling plugs in my yz 125
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Mar 18, 2013 | Yamaha YZ 125 Motorcycles

1 Answer

Why does my 125 ttr keep on fouling plugs


Hi, Anonymous and the usual suspects are:
1. Fuel mixture too rich or enrichner left out too long.
2. Faulty spark plug.
3. Incorrect spark plug for the engine type or service.
4. Piston rings badly worn or broken.
5. Valve guides are badly worn and/or seals worn, crushed or have come off the valve guide and are pumping oil through it.
6. Spark plug cable weak or leaking check for spark jump in the dark.
7. Faulty ignition coil.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Why Does My Dirt Bike Keep Fouling Spark Plugs
TTR 110 keeps fouling the spark plug
YAMAHA TT R125 Owner Service Manual
OEM parts for Yamaha
YAMAHA TT R110E Owner Manual

Feb 09, 2012 | 2006 Yamaha TTR125LW

1 Answer

Scott, 95 GMC 5.7L keeps fouling plugs


Hi Dale,

Several factors can contribute to spark plug fouling:

- The air/fuel ratio may be too rich as a result of incorrect carburetor adjustment or a poorly performing fuel injection system.
- Worn piston rings or valve seals may allow too much oil to leak into the combustion chamber, leading to oil fouling.
- The ignition system may not be performing properly.
- Prolonged idling or continuous low-speed driving may keep the spark plug from reaching its optimum operating temperature. Using too cold a spark plug can lead to the same problem.
- A dirty air cleaner can create a too-rich condition which can lead to fouling.

Have each of the above checked and corrected.

Fuel, oil and carbon fouling can all be the result of different causes but, once a spark plug is fouled, it will not provide adequate voltage to the firing tip and that cylinder will not fire properly.

In many cases, the spark plug cannot be cleaned sufficiently to restore normal operation. Hence, I always recommend that a plug be replace, once it becomes fouled.

Cheers,

Scott


"If this has helped you in any way, please be kind enough to rate this solution"

Nov 02, 2011 | 1995 Chevrolet K1500

1 Answer

95 GMC 5.7l keeps fouling plugs


Hi Dale,

Several factors can contribute to spark plug fouling:

- The air/fuel ratio may be too rich as a result of incorrect carburetor adjustment or a poorly performing fuel injection system.
- Worn piston rings or valve seals may allow too much oil to leak into the combustion chamber, leading to oil fouling.
- The ignition system may not be performing properly.
- Prolonged idling or continuous low-speed driving may keep the spark plug from reaching its optimum operating temperature. Using too cold a spark plug can lead to the same problem.
- A dirty air cleaner can create a too-rich condition which can lead to fouling.

Have each of the above checked and corrected.

Fuel, oil and carbon fouling can all be the result of different causes but, once a spark plug is fouled, it will not provide adequate voltage to the firing tip and that cylinder will not fire properly.

In many cases, the spark plug cannot be cleaned sufficiently to restore normal operation. Hence, I always recommend that a plug be replace, once it becomes fouled.

Cheers,

Scott


"If this has helped you in any way, please be kind enough to rate this solution"

Nov 02, 2011 | 1995 Chevrolet K1500

1 Answer

2002 Yamaha WR250 Keeps fouling the spark plug. What are the possibilities and things to check? Thank you!


Hi, Lynnmcneely and the usual suspects are:
1. Fuel mixture too rich or enrichner left out too long.
2. Faulty spark plug.
3. Incorrect spark plug for the engine type or service.
4. Piston rings badly worn or broken.
5. Valve guides are badly worn and/or seals worn, crushed or have come off the valve guide and are pumping oil through it.
6. Spark plug cable weak or leaking check for spark jump in the dark.
7. Faulty ignition coil.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Why Does My Dirt Bike Keep Fouling Spark Plugs
YZ250F fouls plugs
YAMAHA WR250F Owner Service Manual
OEM parts for Yamaha
YAMAHA WR250R Owner Manual

Sep 29, 2010 | 2003 Yamaha WR 250 F

2 Answers

Plugs keep fouling out on my GL 1100


If any of the spark plugs are fouling out there has to be a carb problem. Are they black when you pull them? Are all of them fouled or just a couple?
If any of them are fouled then you are needing to clean and adjust the carbs.

Oct 29, 2009 | 1980 Honda GL 1100 Innerstate Gold Wing

1 Answer

Spark keeps fouling but no clue why


Are you losing gear oil.
When the crankshaft seal leaks, oil from the gearbox is sucked into the crankcase, and this can foul the plug.
Also check the plug gap, most guys set the gap too small. It should be 0,7mmto 0,8mm. The plug should be a B9 EG, or equivilant.
Now, you can also change the plug cap to a type that has a built in resistor, this also helps with plug life.
Note that 2 strokes use plugs way more than 4 strokes, and you should replace the plug every 15-20 hours to keep your riding pleasant.
Good Bike you have there
Cheers
Jon

Feb 15, 2009 | 2005 Honda CR 125 R

1 Answer

New spark plugs gone out


If the odor is not heavy gasoline, then they appear to be oil fouled. The cheap fix is to buy at any auto parts store oil burning plugs or sleeves, these will keep the spark plugs slightly further out of the cylinder, out of the oils way, and should provide a reasonable resolution.

Check the PCV valve and hose, if they clog they will cause oil to enter engien cylinders. keep me posted

Dec 17, 2008 | 1998 Oldsmobile Bravada

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