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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I have a 1989 1200 sportster and it's running rough lots of white / blue smoke. also a metallic rattle above 20k rev. Think could be carb but any ideas


Hi Karl, blue/white smoke not good, usually oil and the metallic rattle sounds like something broke. Do a compression or leak down test and should be no more than 20 lbs between cylinders. Also I would take it to your local dealer or shop and have them take a listen. Good luck

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1.check your engine oil level. 2.check the silencer whether black smoke or blue smoke? in case black smoke, airfilter is blocked and improper air/fuel screw adjustment in carburetor. in case blue smoke,the oil burns inside the cylinder, check the valve clearance or the cylinder need to reboring or replacement along with piston....

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17.5 Briggs running rich


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Jun 29, 2013 | Motorcycles

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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!

Jun 15, 2012 | 2006 Peugeot XPS CT 125

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Baffelectomy


Well, now that you asked, by removing the baffles it changes the back pressure on the exhaust system. In some cases this causes need for re-jetting the carbs to make it run a bit richer. There are a lot of riders out there that like the louder sound of the baffles either drilled or removed entirely. The exhausts are factory tuned to match the jetting of the carbs.
Keep an eye on the exhaust pipes to see if they start turning blue. If so, it is a sign of the engine starving for fuel and would be a good time to consider re-jetting. Or, if you like the color blue and purple on your exhausts you can leave the jetting alone.
Ride safely, Ed

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1 Answer

2005 yamaha ttr125et has blue exhaust smoke


Blue exhaust smoke means one thing: crankcase oil getting into the combustion process. The most likely cause is worn piston rings. Other possible causes are worn valve guides or a blockage of the crankcase vent. Tip: blue exhaust smoke under acceleration = piston rings. Under deceleration = valve guides.
Also make sure someone did not put a gas/oil mixture in the fuel tank by mistake (thinking it had a two cycle engine).

Nov 01, 2009 | 2005 Yamaha TT-R 125 L

1 Answer

Only runs half throttle


so, can you tell me what kind of carb was on the bike before? was it factory? and what kind of carb was just installed? blue smoke can be caused by burning transmission oil or a rich fuel mixture. that might be a bad crank seal or case gasket, or just improper fuel/oil ratio or improper jetting. black smoke on the other hand is usually caused by too much gasoline burning, but if there were enough gas entering the engine to cause black smoke, the bike probably wouldnt run at all. but, if you can give me more info on the carb swap, and if possible any jetting information or jetting changes, thenI can definitely tell you what your problem is.

Sep 04, 2009 | 2003 Yamaha YZ 250

2 Answers

Blue smoke comes from exaust is it carb or rings


Blue smoke means oil is burning. The most likely reason is oil is getting past your piston rings because of wear. Run a compression check. If it is less than 150 psi it is time for a rebuild. It may run for a while burning oil and you will want to replace most of the parts anyway so it probably won't cost you much more money to keep running it until it dies. Just keep a close watch on your oil, if you run it out of oil it won't run for more than a few minutes.

Apr 07, 2009 | 2003 kawasaki KDX 220 R

1 Answer

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.

Nov 20, 2008 | 2005 BMW R 1200 CL

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