what causes this, carbon built up?

and what should I do?

thanks

 

You're running rich at WOT.

 

has it been doing this for a while or just start? Monkyied around with the jets? Need a tune?

 

I don't floor it that often, but noticed it recently.

Lars, you tuned everything before, not sure if I want to let anyone else touch it.

I'd adjust it, but not sure what I'm really doing.:o

What's the best solution, print your paper, and try to make it run leaner?

 

If it just blew black smoke out the first time you've "kicked it" [for some time], chances are it was just a collection of carbon and "crud" in the combustion chamber. If you've done that a few times...and it is still blowing black smoke, you may have a problem with timing, piston rings or your carb.

 

If it blows black smoke every time you floor it, it's running a tad rich. If it just does it the first time you floor it after have *****-footed it for a while, it's more likely that it's just blowing the soot out of the exhaust system. How to lean it out at WOT depends on which carb you're running...

 

Thanks Guys

I'll have some "safe" fun next time I'm out driving, and see if it only does it the first time, hopefully its just blowing out soot as mentioned.