Question about 1995 Honda VT 600 C Shadow

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95 VT600 DLX spark plugs foul after about 200 - 300 miles in rear cylinder

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  • Anonymous Mar 13, 2014

    keeps fouling rear plug every 15 miles

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If they are black when you pull them out with oil on you them probably need new rings or its possible that the engine is running rich and fouling the plugs and needs carbs adjusted.

Posted on Aug 11, 2011

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1 Answer

Rear spark plug bank is fouled. The 3 in front are fine. What cold be the problem?


I am assuming it is oil fouled rather than fuel fouled. Oil fouling is usually due to valve stem seal leakage. Most engines have the oil return on the cylinder head at the rear. When the engine is shut off, some oil pools at the rear of the head. If the valve guide seals are worn, then the oil will leak around the stem of the #4 valve and eventually foul the plug. If there are no real issues with the engine other than this one, it is usually best to keep a clean plug or two available and swap out the plug periodically when fouling is detected. Then clean the fouled one and keep for reuse later. If it is happening too often, getting the cylinder head reconditioned is a good idea.

Oct 09, 2015 | 2006 Acura MDX Touring

1 Answer

1998 bmw 540i having a misfire on cylinder 5 changed the plugs and coil packs. It ran fine for a couple days, then it began again, giving me a check engine, and it's idling rough at low rpms.


Is the same cylinder causing the problem? If so take a close look at the spark plug for fuel fouling. The cylinder may be over fueled causing plug fouling. You may also have a bad coil or defective spark plug. Try swapping coil and plug with one from adjacent cylinder to see if misfire changes to that cylinder

Apr 06, 2015 | BMW Cars & Trucks

1 Answer

Fouling plug


Get one heat range higher plug for your motorcycle. If it is fouling, Im guessing this is a high mile motorcycle. You dont say anything about make, model, year or miles.

Dec 06, 2012 | Motorcycles

1 Answer

92 vt600, only back cylinder is firing


How so it isn't fouled? If it is getting any gas at all there should be gasoline on the plug assuming the cylinder is in fact not firing. Is the plug sparking? If so what about the carb? Compression check?

Nov 03, 2012 | 1992 Honda VT 600 C Shadow

1 Answer

Rear cylinder is cool to the touch, the front one is hot


The spark plug on the rear cylinder isn't firing. Check the plug for fouling and make sure the spark plug wire is good and connected to the coil and plug properly. Also check the spark plug gap (0.040)

Jun 26, 2012 | 2001 Harley Davidson FXDL Dyna Low Rider

1 Answer

1995 slt dodge dakota 3.9L one cylinder not firing


how many miles, several causes, fouled spark plug, damaged spark plug wire, bad fuel injector, i would check plug and wire first

Jun 09, 2012 | 1995 Dodge Dakota

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

Not hitting on all cylinders 1999 honda shadow 750 with 5000 mile


HI harleyrider6,
No hitting means not firing?
Assuming tht its not firing up upon cranking,
please check if theres gas coming to the spark plugs and sparks too.
Not a bad idea to replace the spark plugs if they are fouled up!

Good luck.

Knight.. (Yamaha Seca XJ750A 1981)

Feb 12, 2009 | 1999 Honda VT 750 CD Shadow A.C.E. Deluxe

3 Answers

Rear cylinder not firing


The first thing I would do is replace the spark plugs again. You can foul a plug and it will cause you more problems than you can ever imagine. I see you have done all the logical things that I would recommend but I did not see you have replaced the plugs after the 200 miles. You would be surprised at how many times a $2.00 part can cause fits beyond belief.

Dec 07, 2008 | 2000 Harley Davidson XL 1200 C Sportster...

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