Anyone have puffs of black smoke come out of the exhaust when idle. and crack the throttle ??? I just noticed this when i was warming the bike up. When I crack the throttle in neutral some puffs of darker smoke comes out. what could be the cause of this ?

I have an 06 Dyna, V&H Big Radius. K&N Filter. and PCIII

 

The fuel table in the ECM richens the fuel mixture until the engine reaches operating temperature. If you gun the throttle you'll get a black puff of smoke, and if you're riding behind the bike you will smell the unburned fuel. Even after the bike warms up you'll likely see a little black puff of smoke off idle. Usually the fuel table is set a bit rich around idle even when the bike is warmed up.

 

so its nothing to worry about? Thanks for your response.

 

Why would you crack the throttle in neutral during warm up on a fuel injected bike? Isn't that the advantage of EFI, not having to actively warm up the engine?

I'm not being sarcastic, I'm really asking. I thought you didn't have to warm it up like that with fuel injection.

 

I had a buddy that wanted to hear what the pipes sounded like, i just blipped the throttle a bit so he could hear them. Thats when we noticed the puff of smoke.

I normally let my bike warm up about a minute or two before taking off. In colder weather i let it warm up longer. I have 1000 miles on it

 

Makes perfect sense to me now!

 

Because it sounds so damn cool!!! [sm=icon_rock.gif]

 

yeah what he said