If the black smoke looks powdery... then it's fuel... if it's bluish and looks like "smoke" then it's oil burning...

DO NOT have a american car mechanic do a rebuild on a honda engine... no matter how good of a mechanic he is he's NOT the guy you want working on your honda engine.. it's an ENTIRELY different world..

Also if the guy is telling you to "rebuild" your engine because there MAY be a fuel injector issue then he's retarded... dirty fuel injectors can be replaced or cleaned... that's certainly not rebuilding your engine...

I've only really seen automatic honda's blow black powdery smoke... the manuals usually only blow smoke when it either has no cat or is on it's way out (rings or valve seals generally).

But I'm a civic guy... so I'm not too versed...

If it's powdery I wouldn't worry period... running rich isn't that bad unless it's CRONIC.

Sometimes car companies do it for WOT just to keep the temperatures down and ensure there's no detonation.