Question about Harley Davidson Harley-Davidson Motorcycle Desktop Telephone

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Black smoke My Harley has a little bit of Black Smoke come out of the Exhaust just when I start the bike. Can Somebody please tell me what it could possibly be. Thank You

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Most harleys will exit black smoke on start up. a cause of this is when you first roll over the engine the cylinder will load with fuel but it will be too lean to fire but on the next roll over when cranking speed is up the mixture will be a little rich and when it lits off will exit the black smoke. also, do not roll the throttle at start up because the accelerator pump will dump a shot of fuel into the manifold. if the air filter was that clogged, you will have problems all over the rpm range and not just at start up. by the way black smoke is unburned fuel and blue smoke is oil. if you see blue/grey smoke it is a sign of low compression, unburned fuel and oil by-passing the control ring, usually disappears when cylinder comes up to temperature. come on pyrhyc, this is basic stuff. if you start blowing blue smoke, check the umbrella valves in the rocker box first, common problem.

Posted on Aug 27, 2008

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Change your air filter and clean the blow by tube that crosses the heads and connects to the back side of the air filter. If the tube or the air filter is clogged, then the oil that the blow by removes is going back into the cylinders, causing the black smoke. Also keep in mind that a Harley will blow a little black smoke upon starting as it ages, it's normal.

Posted on Aug 06, 2008


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