Question about Yamaha XVS 1100 Dragstar Classic Motorcycles

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My xv 1100 smokes and fouls plug when it has right amount of oil in

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The question is, whare is the fouling coming from. Is it the correct oil level and correct grade oil. I would consult the manual. Maybe the plugs are too hard.

Posted on Mar 11, 2011

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If the oil level is correct, about the only thing remaining is worn rings. You can try another brand of oil and use a heavier oil, but it will always come back to the rings having to be changed in the end.

Posted on Mar 11, 2011

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I have a 95 wr250 it fouls plugs on idle and just doesn't sound right till u hit power band it blowing alot of smoke I'm running the fuel at 35:1 it also fouls plugs when I'm working the bike in the low...


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How did the engine oil get inside the cylinder in the first place? The car has many seals, gaskets, and O-rings that are designed to keep the engine oil from entering the cylinder, and one of them has failed. If too much oil leaks into the cylinder and fouls the spark plug, it will cause a misfire (engine miss) in that cylinder, and the spark plug will have to be replaced or cleaned of the oil. Using thicker weight engine oil or an oil additive designed to reduce oil leaks might help reduce the amount of oil leaking into the cylinder.

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Floods out 5 times out of 10 when trying to start car. Have to wait an hr. before trying to start again..Also a lose of power when going up a hill. Blue smoke comes out the exhaust. Also It won't change...


Blue smoke is caused by engine oil entering the cylinder area and being burned along with the fuel air mixture. As with the white smoke, just a small drop of oil leaking into the cylinder can produce blue smoke out the tailpipe. Blue smoke is more likely in older or higher mileage vehicles than newer cars with fewer miles. How did the engine oil get inside the cylinder in the first place? The car has many seals, gaskets, and O-rings that are designed to keep the engine oil from entering the cylinder, and one of them has failed. If too much oil leaks into the cylinder and fouls the spark plug, it will cause a misfire (engine miss) in that cylinder, and the spark plug will have to be replaced or cleaned of the oil. Using thicker weight engine oil or an oil additive designed to reduce oil leaks might help reduce the amount of oil leaking into the cylinder.

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1 Answer

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Fouling can be serious..... or not ....can just be the enricher on to long or worn/bad piston rings. Burning oil and smoking would also indicate bad rings. Could also just be bad plugs. Make sure you got the right ones in there. For $ 4.00 go get new ones at the dealer. Do a compression test - If its OK (over 90 and both within 5 lbs) .... its not the rings. Make sure you have the right amount of oil, and (believe it or not) a weak battery can cause the problems u describe, so check that out as well.

good luck.....let me know how it goes, OK ?

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