Question about 2003 Cagiva Xtra-Raptor 1000

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Rear cylinder spark plug keeps oiling up. I have been told it's due to under use, but I suspect worn valve guides. Only done 20,000kms though

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  • Cagiva Master
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Simple solution is put a hotter plug in the rear.

Posted on Apr 23, 2010

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Posted on Jan 02, 2017

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Rocam1.6 06 model uses oil sparkplug No2 gets wet with blk carbon, misfirin smokin white.If I change tht spark plug it goes well For3 days.Mechanic changed the rings after 6 weeks problem persists.hlp


The carbon suggests that oil is finding its way into that cylinder and oiling/carbonising the plug.

The mechanic changed the rings so it's doubtful that the oil is finding its way into the cylinder, past the rings. The only other thing I can think of is that the valve stem guide is worn (this would allow oil down into the cylinder) or the valve stem seal is perished/worn.

The photos below are generic images. They are NOT of your car:




26063798-uep1qeforvmfktksxbn30q5u-5-0.jpeg A valve in the valve guide. A worn guide can allow the valve stem to 'rock' and permit oil to trickle down the valve stem into the cylinder.



26063798-uep1qeforvmfktksxbn30q5u-5-1.jpeg The seal itself - rubberised.

There's many different types of seal. General image below just for illustration purposes:


26063798-uep1qeforvmfktksxbn30q5u-5-3.jpeg
Bluish smoke indicates that oil is being burnt in a cylinder. To be honest, worn valve guides/worn seals are quite common. You say your car is misfiring? That would indicate quite a lot of oil is fouling the plug. In most cases there would be no misfire after just 3 days. The exhaust would cough out bluish smoke at start up and maybe on the over-run, when going downhill.

A short term measure is to try a can of valve seal additive to see if the problem temporarily goes away. Repair is the best option though.


26063798-uep1qeforvmfktksxbn30q5u-5-6.jpeg
Try a can of valve seal? It's worth a shot..

Jan 22, 2016 | Cars & Trucks

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

When starting toyota fortuner 3.0 liter blowing blue smoke what is causing this


It is oil smoke. The most common causes are worn valve guide seals, a faulty PCV valve, or, worn or broken oil control rings on the pistons. Only 1 or 2 cylinders need be at fault.

Check the PCV valve for fouling. Have a compression test done. If readings are low or irregular, pour a few ccs of engine oil into the suspect cylinders thru the plug holes. If compression readings then improve, it is probably the rings at fault.

Less common causes are worn big end bearings spraying excessive oil up the cylinder walls, or a leak from the head gasket, oil to cylinder.

Apr 30, 2014 | 2004 Toyota Camry

1 Answer

95 saturn gas on the spark plugs


It is normal for them to show gas-continued cranking of the engine keeps putting more gas in the cylinders.
Oil is getting in there from worn engine parts-piston rings or worn valve guides or valve stem seals. If enough oil gets on the plug, it will inhibit sparking- known as "oil fouling". Oil fouled plugs can be cleaned and reused. The near-prohibitive cost of repairing the worn engine parts with an engine rebuild may make you want to remove the plugs and clean them as often as necessary to keep them from misfiring. However, if it is just worn valve stem seals on those two cylinders, a shop could replace the seals without having to take the cylinder head off. The cost for that job would be some less. You might want an estimate on that. The seals are a rubber composite and quite cheap. A little tricky, but it can be done without pulling the head off.
Now that you have cleaned those two plugs and put them all back in, the gas will have evaporated. So if it does not want to start, you need to check for spark to verify the ignition system is working. The easiest way and to avoid a shock is to buy a cheap spark tester, pull off a plug wire from a plug and hook to tester. The tester is then clipped to a metal bracket or bolt as a ground. Then have someone crank the engine over, while you watch the tester for a spark-a strong blue spark, not yellow or orange, will verify ignition system is good. If no spark exists, test all cylinders. One or two with no spark could be a bad coil on the coil pack. But if no spark on any, the ignition system will have to be diagnosed. Good luck./

Dec 15, 2013 | Cars & Trucks

1 Answer

ONE FOULED SPARK PLUG


Either worn valve guides, valve guide oil seals on that particular cylinder, or worn piston rings. You need to perform a compression test to find out which one of these it is.

Compression check each cylinder with all plugs removed. Take notes on which cylinder has the weakest compression.

If no compression difference and if all operating within range, then change the valve guide oil seals on problematic cylinder.

If the cylinder shows a significant drop in compression, then drop no more than five or six drops of oil down the plug hole of the problematic cylinder, and perform the compression test again. The oil will temporarily seal any worn piston rings, so the pressure should rise when retesting if the rings are worn. If the pressure remains low, then your valves are not sealing properly and require attention.

Nov 13, 2012 | 1990 Toyota Camry

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

I have oil on my spark plugs I need to know what to look for?


A spark plug shorted by excessive oil entering the combustion chamber is shown below. This is often caused by piston rings or cylinder walls that are badly worn. Oil may also be pulled into the chamber because of excessive clearance in the valve stem guides, or badly worn valve stem seals.

If the PCV valve is plugged or inoperative, it can cause a buildup of crankcase pressure. This condition can force oil and oil vapors past the rings and valve guides into the combustion chamber.

Keep us updated.

May 30, 2011 | 2005 Suzuki Forenza

1 Answer

Has good spark from ignition leads to plugs. intermitant firing on one cylinder. then will only run on one cylinder fouling the other spark plug.............


Hi, Bruceunswort 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.
For more information about your issue at you will need and free valuable downloads th please visit the websites below. Good luck and have a nice day.
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2271892
Backfire Issues Ducati ms The Ultimate Ducati Forum
Free Ducati Motorcycle Service Manuals for download
Ducati OEM Parts Fiche Lookup and Online Ordering
Ducati Maintenance

Jan 03, 2011 | Ducati 750 SS Motorcycles

3 Answers

Spark plugs cylinder filled with oil


motor oil in the combustion chambers[where the spark plugs are] is NOT NORMAL it is evidence of failure of valve seals and/or worn piston rings,requiring major motor repair.try to return it & get your money back,or at least a credit towards repair.

Oct 06, 2009 | Hyundai Motor 1992 Elantra

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