Question about 2005 Husaberg FS 450 c

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Blue smoke My engine sounds good while running (still could use a little carb cleaning) but there is some blue smoke from the exhaust. As long as I keep an eye on the oil

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Is it even anything to worry about?Blue smoke is probably oil smoke as you figured. Now how long did you run the bike once you got it fired up? Did you ride it? I'm wondering only because if you just fired it up, seen the smoke and didn't ride the bike, the oil smoke could have just been oil build-up in the cylinders from sitting and could clear up with a few miles. If you did ride it and the smoke persists, then you probably have worn rings/scored cylinders/leaking valve stem seals. That can be overlooked if it is not too bad, and you keep an eye on your oil level, like you're thinking. If your using a liter oil every 100 miles or something, then you might want to consider a rebuild if you plan on keeping the bike and sinking a bunch of money into it. It all depends on the severity and your personal comfort level with the situation.,,,

Posted on Nov 10, 2008

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Blue smoke comes out my exhaust only when choke is on


Blue smoke is usually the result of burning oil. It should not be burning at all, as it shouldn't be entering the combustion chamber or leaking on or in anything in a properly operating "4 stroke" (or 4 cycle) engine. Blue smoke in exhaust is not a normal condition for a properly operating "4 stroke" or "4 cycle" engine.

When the choke is on, the mixture of fuel and air is brought from "Stoichiometric" (about 14.7 parts air to 1 part gasoline or a "14.7:1 ratio") to a more "rich" mixture (about 13:1). This is not the ideal mixture to run, but it makes it easier for the engine to start and stay running until warmed up. When the mixture is rich, is is not uncommon to see black smoke - which happens because of incomplete combustion in the engine. The balance of the combustion happens in the exhaust system, where the energy in the fuel is converted only into heat and zero power. Since there is little air in the system, black smoke is produced. It may even smell of raw gasoline, too.

When running at proper mixture ratios of fuel to air, little if any smoke should be observed in the exhaust gases. It is possible that this small amount of oil being burned is so minute that it is not readily visible under these conditions - but is probably present never the less. You should carefully monitor the engine oil level and keep it filled. Oil leaking in the combustion chamber can indicate a problem that can be expensive to repair.

Two cycle (or two stroke) engines on the other hand, require that the oil and gasoline be premixed in the tank or are blended together "on the fly" and for this reason is not unusual to see blue smoke in the exhaust gases even when unchoked.

I hope this helps & good luck!

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Blue smoke


sorry to say blue smoke is oil and with what you've described sounds like the oil rings on the pistons have given up the ghost, time for a new engine or a rebuild sorry for the bad news. valve stem seals are the only other thing that will cause exhaust smoke but only when you first start the car never while running. hope i have been of some assistance.

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Blue smoke


Blue smoke is probably oil smoke, as you figured. Now, how long did you run the bike once you got it fired up? Did you ride it? I'm wondering only because if you just fired it up, seen the smoke and didn't ride the bike, the oil smoke could have just been oil build-up in the cylinders from sitting and could clear up with a few miles. If you did ride it and the smoke persists, then you probably have worn rings/scored cylinders/leaking valve stem seals. That can be overlooked if it is not too bad, and you keep an eye on your oil level, like you're thinking. If your using a liter oil oil every 100 miles or something, then you might want to consider a rebuild if you plan on keeping the bike and sinking a bunch of money into it. It all depends on the severity and your personal comfort level with the situation.

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